f human cells could use the food eaten in that form, there would be no need for a digestive system. The digestive system changes the food into a form that can be used by the cells and that enables the nutrients to get into the blood so they can be transported throughout the body
There are two kinds of digestion: mechanical and chemical. Mechanical digestion involves physically breaking the food into smaller pieces. Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates. (An enzyme is a protein that can catalyze certain biochemical reactions).
The Digestive Process
Mouth
Food is chewed into smaller pieces. Adults have 32 specialized teeth—teeth that can grind, chew, and tear different kinds of food. The tongue is an organ consisting of skeletal muscles (voluntary muscles) that move the food around the mouth to allow for efficient mechanical digestion. Salivary glands beneath and in back of the tongue secrete the saliva that allows for easier swallowing of food and the beginning of chemical digestion.
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Pharnyx
Swallowing forces the chewed food through a tubular entrance (pharynx) to the esophagus (food tube). As food is swallowed a flap-like valve, the epiglottis, closes over the trachea (windpipe) to prevent food entering the windpipe and causing choking.
The stomach starts chemical digestion of protein. Secretions from the stomach lining consist of about two liters of hydrochloric acid (HCl), pepsin, and other fluids that make up gastric fluids each day. The fluid is extremely acidic and it helps kill bacteria and other pathogens that may have been ingested.
The thick mucus also produced by the stomach lining usually keeps the acids from damaging the lining. If not enough mucus is produced or if too much acid is produced, peptic ulcers form. Heredity, stress, smoking, and excessive alcohol intake can make the ulcers worse. The condition can worsen and bleeding ulcers can result.
Food stays in the stomach for approximately 3-4 hours and moves through another sphincter muscle to pass into the small intestine.
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Small intestine
Nearly 7 meters in length, the small intestine is folded and curled around a small area in the abdominal cavity. The inside surfaces of the intestine are covered with projections called villi. These finger-like structures are covered in smaller projections called microvilli and work to absorb food molecules that have been broken down by the processes of chemical digestion.
The small intestine has three distinct parts: the duodenum, the jejunum, and the ileum. Each day, about 9 liters of fluid enters the duodenum. Most chemical digestion takes place in the duodenum by chemicals secreted by the liver, pancreas and small intestine. The other two sections of the small intestine, the jejunum and the ileum, absorb food molecules by way of the villi directly into the blood stream.
Large intestine
The large intestine receives the material “left-over” from chemical digestion that is basically nutrient free. Only water, cellulose, and undigestible materials are left. The main job of the large intestine is to remove water from the undigested material. Water is quickly removed from the material through villi and returns to the blood stream.
Liver
The liver is a large organ located just above the stomach. The liver produces bile which helps digest lipids. Bile is stored in the gallbladder and flows from the gallbladder to the duodenum where it helps digest fats.
The picture at the left shows a human liver.
Gall bladder
The gall bladder is a small, greenish organ located just under the liver. It stores bile produced by the liver until it is secreted directly into the first section of the small intestine.
Pancreas
The pancreas has three important functions that help the digestive system change food into a form that can be used by the cells.
1) It produces enzymes which help break down proteins, lipids, and carbohydrates.
2) It produces the hormone, insulin, which helps regulate blood glucose levels.
3) It produces sodium bicarbonate which helps to neutralize stomach acids.
Checking for Understanding.......
1. What is the function of the digestive system?
To change ingested food into a form that can be used by the cells, to get the nutrients into the blood stream, to reabsorb water, and to eliminate wastes.
2. What is the function of the following parts/organs of the digestive system?
a. mouth—houses teeth, salivary glands and tongue for mechanical and chemical digestion
b. teeth—chews, grinds, and tears food into smaller pieces
c. esophagus—food tube; leads from the pharynx to the stomach
d. stomach—
churns food to mix with gastric enzymes and acid to continue mechanical and chemical diges
What is the average speed (mph) for a car journey of 140 miles that began at
9:30 am and finished at 12:00 noon?
Answer:
The car is going 60 miles per hour✔✔
Explanation:
Describe an example of how forests are used as a resource. What is one advantage of using the resource in this way? What is a disadvantage?
Please help!!
Answer:
They are used as resources because of the trees. the government uses the trees to make paper and other necessary objects for the public. the disadvantage is that it makes the earth unhealthier and clearcutting can lead to major problems.
Explanation:
please answer i really need help
Mutations can produce a beneficial change in an organism after many generations.
True or False
which type of asexual reproduction would be seen in a kitchen? In a Garden? On a walk in the woods? State which types of reproduction can be observed in everyday "real life".
Need help with this ASAP!
Answer:
1 Binary Fission, budding, fragmentation, spore formation, Regeneration and vegetative propagation.
2
The type of asexual reproduction would be seen in a kitchen Binary Fission and budding. In a garden, vegetative propagation, fragmentation, spore formation, and regeneration.
What is Asexual reproduction?Asexual reproduction may be characterized as a mode of reproduction that does not involve the fusion of gametes or a change in the number of chromosomes. In this mode of reproduction, a new offspring is produced by a single parent. The new individuals produced are genetically and physically identical to each other, i.e., they are clones of their parents.
The types of asexual reproduction that can be observed in everyday "real life" are as follows:
Binary fission: Single parent cell doubles its DNA, then divides into two cells.Budding: Small growth on the surface of the parent breaks off, resulting in the formation of two individuals.Fragmentation: Organisms break into two or more fragments that develop into a new individual.Regeneration: The natural process of replacing or restoring damaged or missing cells, tissues, organs, and even entire body parts to full function in plants and animals.Vegetative propagation: It is an asexual method of plant reproduction that occurs in its leaves, roots, and stem.To learn more about Asexual reproduction, refer to the link:
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Giving brainliest
Describe the levels of organization in a complex system. Write about a sports team, a supermarket, a digital audio player, or an orchestra. Or choose your own example.
Answer:
An orchestra made up of instruments that are grouped with others of the same kind like the , then group moto sections of instruments that are similar, like the strings, brass, and percussion.
Explanation:
It takes Stephen 12 minutes to drive to school. His route is 16 km long. What is Stephen’s average speed on his drive to school?
Answer:
Two more than the sum of a number and three is more than fifteen. (Write the equation and solve it)
Explanation:
Answer:
I think the answer would be 80 kilometers/hour which would also be 49.71 miles/hour.
Explanation:
I could be wrong though.... sorry if I am
A group of students is investigating whether air resistance depends on the size of an object. The students throw two paper pieces each with the same force. One piece of paper is flat and the other is scrunched into a ball. The distance traveled by each paper piece is shown.
Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by flat paper 0.2 m 1.2 m 1.5 m 0.8 m
Distance traveled by scrunched paper 1.5 m 2.4 m 3 m 2 m
What was the test variable (independent variable) in this experiment?
Distance traveled by flat paper
The shape of the paper
Distance traveled by scrunched paper
The number of students
Answer:
The shape of the paper.
Explanation:
Flat Piece of Paper: Flat, (quite obvious haha) and not the easiest to throw
Scrunched up piece of paper: Easier to throw because it's simply in the shape of a ball, hence a ball being easy to throw. (:
A wastewater plant in Houston had a sewage leak that spilled a million gallons of raw sewage pollution into a lake. If the pollution was only spilled in the lake, why is the government warning farmers that live 5 miles away not to drink their well water?
A.Pollution will be evaporated and contaminate the farmers' wells when it rains.
B.Lake water remains surface water and eventually affects all surface water in the area.
C.Lake water eventually becomes groundwater and could contaminate area wells.
D.Groundwater does not flow so pollution remains in the area forever.
Answer:
it has to be either B or C
Explanation:
Which is a harmful role of bacteria?
making antibiotics
producing oxygen
decomposing waste
causing tooth decay
What are some ways in which you can protect yourself from collisions?
Answer:
Limit your night driving, limit your passengers, Get as much supervised practice driving as possible, and always use your seatbelt.
Explanation:
Simple search
Answer:
wearing a seat belt
Explanation:
because when you slam on the brakes the seatbelt locks so you wont go flying
*spam answers won't be tolerated* Could somebody help, please? Will give brainliest and 100 points!
Which of the following is being used to catch fish?
electricity
light
sound
all of the above
Answer:
I Believe your answer would be
All Of The Above
Explanation:
have a nice day!
Answer:
D would be your answer all of the above
Explanation:
Is D because i took this question before and is was correct
Mutations are sudden changes that may occur in a gene or chromosome. These changes may affect the way traits are inherited. If a mutation occurs in a body cell, such as a bone cell, the mutation affects only the organism that has it. If the mutation occurs in a sex cell, then it can be passed on to an offspring. Some mutations are helpful and can be desirable in an offspring.
Determine whether each item below is part of the human life cycle, the cell cycle, or both.
Answer:
I need an image or something to answer this please include one in your question.
Explanation:
Mitosis is a type of cell division that occurs
I. to make more cells so organisms can grow.
II. so organisms can replace old or damaged cells.
III. when organisms make sex cells for reproduction.
IV. only during fetal stages of development.
Answer Choices:
A. I, II, and III only
B. II, III, and IV only
C. I and II only
D. I and IV only
Answer: a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
In cell biology, mitosis is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei. Cell division gives rise to genetically identical cells in which the total number of chromosomes is maintained
Answer:
C. I and II only
Explanation:
Statement I is correct because mitosis is the process that allows for cell growth, since it creates more cells in the body.
Statement II is also correct because mitosis allows for growth and repair. It creates new cells that replace old ones.
Statements III and IV are wrong. Meiosis, instead of mitosis, is the process that creates sex cells. Additionally, mitosis does not only occur during fetal stages of development but occurs throughout one's life.
So, C is the correct answer because only I and II are correct.
Which is correct about pressure distribution due to uneven heating of the earth’s surface? (1 point)
A. The pressure distribution remains the same.
B. The air moves from low to high pressure systems.
C. The air moves from high to low pressure systems.
D. The heating of the earth’s surface does not affect pressure.
whoever gets it right gets brainilest!!!
SCIENCE
Answer:
The Air moves to high to low system.
Explanation:
I think because of hot temperature it is hot.
The correct statement about pressure distribution due to uneven heating of the earth’s surface is the air moves from low to high-pressure systems. The correct option is B.
What is pressure distribution?Pressure distribution is sometimes different in different areas. This happens due to the uneven warmth of the earth. The uneven heating causes a difference in temperature and cause different pressure in areas.
Where there is a low temperature, the air pressure is higher. During uneven heating, the air blows from low to high-pressure systems. The uneven heating of the earth is due to the reason that water heat slower than the land. This causes air to warm and expand and rise.
Thus, the correct option is B. The air moves from low to high-pressure systems.
To learn more about pressure distribution, refer to the link:
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i need help w/ both so plz help
Answer:
6,000 years, Erosion
Explanation:
Thats what i gathered i didnt have enough information
Which of the following organisms would be considered the most important part of the ocean's ecosystem because they are producers?
A: Clams
B: Dolphins
C: Jellyfish
D: Phytoplankton
Question 9 (ID=3246988)
The Zooplankton in this food chain get their energy from consuming the -
A: shrimps
B: algae
C: damselfish
D: barracuda
Answer:
b:algae
Explanation:
its obvious.....look at the diagram
Answer:
b: algae
Explanation:
Suppose Gene A on the left chromosome is damaged and no longer function. What form of the trait would show? Why ?
Answer:
An X-linked recessive gene almost never has a counterpart on the Y chromosome. Therefore excessive traits on the X chromosome
Explanation:
Which option below is NOT used to control the flow of electricity in a circuit?
A
switch
B
fuse
C
protons
Answer:
protons its the flow of electricity but does not controll it
Protons is not used to control the flow of electricity in a circuit. The correct option is C.
What is a circuit?A circuit is a closed loop that allows for electricity to flow through it. There are different parts that make up a circuit. For example, a battery is the energy source of a circuit, and wires allow for the flow of electricity. In a circuit, the flow of electricity can be controlled with different tools or devices, such as switches and fuses.
The flow of electricity can be controlled with switches and fuses in a circuit. The purpose of a switch is to open or close the circuit, allowing or blocking the flow of electricity.
On the other hand, a fuse is a safety device that is designed to protect a circuit from electrical overloads. When the electrical current in a circuit becomes too high, the fuse will blow, stopping the flow of electricity to prevent damage or fire.
Therefore, the correct option is C.
Learn more about Electricity here:
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Plz help will mark brainliest if correct answer only
to which three stimuli do plants respond
Answer:
D
Explanation:
I remember this from when I was studying this!
Sorry I don't know how to explain this.
To which domain would we assign extremophiles that can survive in steam, in acid, and in high radiation?
Answer:
I would say Acidophiles since you said Acid.
Explanation:
Please i need this NOW lkjsadfljasvjlijocj
In deep ocean environments, there is no sunlight and pressures are very great. Energy would not be used for:
Answer:
Energy from the sun (solar) will not be used to light up the oceans, if there is no sunlight, no solar energy would be present. Good day. This was in my own words.
Every DNA strand has an EQUAL number of adenine and thymine nucleotides in a molecule. Explain why.
Is this true for cytosine and guanine nucleotides? Explain your answer.
Is this true for cytosine and adenine nucleotides? Explain your answer.
all you need to know is in the pic bellow
Answer:
D.
Explanation:
Answer: The answer is D!
Explanation: This is because once the equation is added it needs to be balanced, and D yields a balanced equation.
Soney listed two structures found in seedless vascular plants.
1 - stems 2 - roots
Which structures in nonvascular plants are similar to these two structures?
1 - leaves 2 - spores
1 - stalks 2 - rhizoids
1 - rhizoids 2 - stalks
1 - spores 2 - leaves
Answer:
b
Explanation:
What is the tool that scientist use to analyze the genetics of a family
A. an pedigree
B. An phenotype
C. An genetic engineering
D.an Punnett square
Science
please answer for me
What are some activities you may engage in that could involve collisions?
Answer:Football
Explanation:
How is excess thermal energy released from your body?
A: Running
B: Increased breathing rate
C: Perspiration
D: Laughing
Answer:
Perspiration
Explanation:
