AnswersBiology - SC3209 ICThe Digestive System

The Digestive System — Unit test Answers

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How does the cardiovascular system help the body maintain homeostasis?

A
osmosis and capillary action
B
capillary action and thermoregulation
C
thermoregulation and hormone transport
D
hormone transport and osmosis
22
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Which of the following starts to break down as soon as they enter the mouth?

A
carbohydrates
B
proteins
C
fats
D
nucleic acids
23

How does the structure of the alveoli allow for its function of gas exchange?

A
Alveolar sacs have space to hold mucus that makes gas exchange easier.
B
Alveolar sacs rely on valves to ensure that air flows only in one direction.
C
Alveolar sacs are located within muscles that contract, which increases gas exchange.
D
Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
24

Homeostasis is the ability of the body to maintain internal balance despite changing external conditions. How does the respiratory system help maintain homeostasis?

A
The respiratory system helps release hormones to control body processes.
B
The respiratory system helps release unwanted heat and water from the body.
C
The respiratory system produces white blood cells that kill disease-causing organisms.
D
The respiratory system releases enzymes that help in the break down of food.
25

Which best describes the peripheral nervous system?

A
It is made up of the brain and spinal cord.
B
It transmits information that is received from stimuli.
C
It is part of the autonomic nervous system.
D
It processes information that is received from stimuli.

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