Question 1

Which of the following best describes the main function of the gill structures seen on the animal in the first image?

Accepted Answer

They increase the surface area for gas exchange with water.

Question 2

Referencing the chemical equation for cellular respiration in the second image, what is the primary biological purpose of this process?

Accepted Answer

To release energy stored in glucose for cellular activities.

Question 3

Based on the third image, which process is responsible for the movement of oxygen from the alveoli into the blood in human lungs?

Accepted Answer

Diffusion

Question 4

The animals shown in the fourth image (a jellyfish and a flatworm) rely on which of the following for internal transport of nutrients and gases?

Accepted Answer

Gastrovascular cavity

Question 5

According to the fifth image, which of the following is NOT a function of the circulatory system?

Accepted Answer

Production of glucose from sunlight

Question 6

In the sixth image, which type of blood vessel is primarily responsible for the exchange of gases and nutrients with tissues?

Accepted Answer

Capillaries

Question 7

Based on the seventh image, which organ is responsible for pumping blood throughout the body and maintaining circulation?

Accepted Answer

Heart

Question 8

The eighth image shows a human heart. Which chamber receives oxygen-poor blood from the body?

Accepted Answer

Right atrium

Question 9

In the ninth image, which of the following statements best distinguishes an open circulatory system from a closed circulatory system?

Accepted Answer

In an open system, the circulatory fluid is not always confined to vessels.

Question 10

Which of the following animals, as shown in images 10–14, is most likely to have a closed circulatory system?

Accepted Answer

Octopus

Question 11

The fish circulatory system shown in image 15 is best described as:

Accepted Answer

Single circulation with a two-chambered heart

Question 12

Refer to images 16–18. Which animal has a three-chambered heart and both pulmonary and systemic circuits?

Accepted Answer

Frog

Question 13

In the mammalian heart (see image 19), which vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Question 14

Based on the circulatory diagram in image 20, which of the following best describes the direction of blood flow through the systemic circuit?

Accepted Answer

From the left ventricle to the body tissues and back to the right atrium

Question 15

Which of the following equations correctly represents the process of cellular respiration as shown in image 2?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 16

Which of the following best explains why capillaries (see image 6) are only one cell layer thick?

Accepted Answer

To maximize the rate of diffusion of gases and nutrients

Question 17

Which of the following statements about the mammalian circulatory system (see image 20) is correct?

Accepted Answer

The right side of the heart pumps oxygen-poor blood to the lungs.

Question 18

Which of the following is a key difference between the open circulatory system of a snail (image 10) and the closed circulatory system of an octopus (image 12)?

Accepted Answer

In a closed system, blood is always contained within vessels.

Question 19

Which of the following best describes the function of valves in veins (see image 6)?

Accepted Answer

They prevent the backflow of blood.

Circulation and Gas Exchange in Animals

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