P4 Science · Chapter 17brightbit.net/worksheets
Human Digestive System (Advanced)
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- 1.
What is the role of the digestive system?
(a) To pump blood around the body(b) To break down food into simple substances that can be absorbed into the bloodstream(c) To remove waste gases from the body(d) To produce hormones that regulate growth
- 2.
Where does digestion begin?
(a) The stomach(b) The small intestine(c) The mouth(d) The large intestine
- 3.
What is the function of enzymes in digestion?
(a) To kill bacteria in the food(b) To speed up the chemical breakdown of large food molecules into smaller ones(c) To absorb water from the digested food(d) To provide energy for the digestive process
- 4.
Which organ produces hydrochloric acid to help digest food and kill harmful bacteria?
(a) Liver(b) Pancreas(c) Small intestine(d) Stomach
- 5.
Where does most chemical digestion and absorption of nutrients take place?
(a) The mouth(b) The stomach(c) The small intestine(d) The large intestine
- 6.
What is the main function of the large intestine?
(a) To digest proteins(b) To absorb nutrients from digested food(c) To absorb water from undigested food and compact waste into faeces(d) To produce digestive enzymes
- 7.
What does bile do in the digestive process?
(a) It digests proteins chemically(b) It emulsifies (breaks up) fat into tiny droplets to increase the surface area for lipase to act on(c) It kills harmful bacteria in the small intestine(d) It absorbs glucose into the bloodstream
- 8.
Why is the small intestine lined with millions of tiny finger-like projections called villi?
(a) To produce digestive enzymes(b) To increase the surface area for absorption of digested nutrients(c) To move food along the digestive tract using waves of muscle contraction(d) To produce bile for fat digestion
- 9.
List the organs of the digestive system in order, starting from the mouth.
- 10.
Explain why it is important that digested food molecules are small enough to pass through the wall of the small intestine.
Answer key — P4 Science: Human Digestive System (Advanced)
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- 1.(b) To break down food into simple substances that can be absorbed into the bloodstream
- 2.(c) The mouth
- 3.(b) To speed up the chemical breakdown of large food molecules into smaller ones
- 4.(d) Stomach
- 5.(c) The small intestine
- 6.(c) To absorb water from undigested food and compact waste into faeces
- 7.(b) It emulsifies (breaks up) fat into tiny droplets to increase the surface area for lipase to act on
- 8.(b) To increase the surface area for absorption of digested nutrients
- 9.mouth oesophagus stomach small intestine large intestine rectum anus
- 10.only small molecules like glucose and amino acids can pass through the intestine wall into the blood to be transported to cells; large molecules cannot cross the wall
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