Question 1

Which of the following best describes the four steps of gas exchange in animals?

Accepted Answer

Ventilation, gas exchange, circulation, cellular respiration

Question 2

Why do large animals require a circulatory system, while small or thin animals like flatworms do not?

Accepted Answer

Diffusion is only efficient over small distances, so large animals need a circulatory system to transport gases and nutrients.

Question 3

Which of the following is a key difference between open and closed circulatory systems?

Accepted Answer

Open systems have hemolymph that is not confined to vessels, while closed systems have blood confined to vessels.

Question 4

In a four-chambered heart, which of the following correctly describes the flow of blood?

Accepted Answer

Right atrium → right ventricle → lungs → left atrium → left ventricle → body

Question 5

Which equation correctly represents cardiac output (CO) in terms of heart rate (HR) and stroke volume (SV)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 6

What is the main advantage of countercurrent exchange in fish gills?

Accepted Answer

It maintains a large partial pressure difference for oxygen across the entire gill surface.

Question 7

Which of the following statements about capillaries is correct?

Accepted Answer

Capillaries are composed of a single layer of endothelial cells to facilitate exchange.

Question 8

A patient has a defect in their AV (atrioventricular) node. Which of the following is most likely to be affected?

Accepted Answer

The transmission of electrical signals from the atria to the ventricles.

Question 9

Which of the following best explains why water breathers expend more energy ventilating their respiratory surfaces than air breathers?

Accepted Answer

Water is denser and contains less oxygen than air.

Question 10

Which of the following is a function of the lymphatic system in vertebrates?

Accepted Answer

It returns excess interstitial fluid to the circulatory system.

Question 11

Which of the following animals is most likely to have a single circulatory circuit?

Accepted Answer

Fish

Question 12

What is the primary role of hemoglobin in the blood?

Accepted Answer

To transport oxygen from the lungs to the tissues.

Question 13

Which of the following best describes the relationship between diffusion time and distance?

Accepted Answer

Diffusion time is proportional to the square of the distance ($$t \propto d^2$).

Question 14

A mammal is experiencing a drop in blood pressure. Which of the following physiological responses is most likely to occur?

Accepted Answer

Constriction of arterioles in noncritical tissues to divert blood to vital organs.

Question 15

Which of the following is a unique feature of the avian (bird) respiratory system compared to mammals?

Accepted Answer

Birds have unidirectional airflow through their lungs, allowing gas exchange during both inhalation and exhalation.

Question 16

Which of the following best explains why hemolymph in open circulatory systems is less efficient at delivering oxygen than blood in closed systems?

Accepted Answer

Hemolymph is not confined to vessels, resulting in lower pressure and slower flow rates.

Question 17

Which of the following statements about the mammalian heart is correct?

Accepted Answer

The left ventricle pumps oxygenated blood to the systemic circulation.

Question 18

Which of the following best describes the function of baroreceptors in the circulatory system?

Accepted Answer

They detect changes in blood pressure and trigger compensatory responses.

Question 19

A person is exposed to high altitude, where the partial pressure of oxygen is lower. Which of the following adaptations would help improve oxygen delivery to tissues?

Accepted Answer

Increased production of red blood cells to enhance oxygen-carrying capacity.

Question 20

Which of the following is a correct statement about the role of the medulla oblongata in breathing?

Accepted Answer

It regulates the rate and depth of breathing in response to pH changes in cerebrospinal fluid.

Circulation and Gas Exchange: Structure, Function, and Evolution

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