Question 1

Which of the following best explains why multicellular animals require a circulatory system, whereas unicellular organisms do not?

Accepted Answer

Multicellular animals cannot exchange materials directly with the environment due to the distance between cells and the external surface.

Question 2

A fish’s circulatory system is less efficient at delivering oxygen to tissues compared to mammals. Which feature of fish circulation is primarily responsible for this?

Accepted Answer

Blood pressure drops significantly after passing through the gill capillaries, slowing the delivery of oxygen-rich blood to tissues.

Question 3

Which of the following correctly matches the heart structure with the type of circulation in mammals and birds?

Accepted Answer

Four-chambered heart; double circulation with complete separation of oxygen-rich and oxygen-poor blood

Question 4

During the cardiac cycle, what is the primary function of the atrioventricular (AV) valves?

Accepted Answer

To prevent blood from flowing back into the atria during ventricular contraction

Question 5

Which equation best represents the calculation of partial pressure of oxygen ($$P_{O_2$}) in $$atmospheric air, given that oxygen is 21% by volume and atmospheric pressure is 760 mmHg?

Accepted Answer

$$P_{O_2$} = 0.21 	imes 760$$

Question 6

Which of the following statements about capillary exchange is correct?

Accepted Answer

Fluid moves out of capillaries at the arteriole end due to higher blood pressure and into capillaries at the venule end due to higher osmotic pressure.

Question 7

A patient’s blood pressure is measured as 120/70 mmHg. What do these values represent?

Accepted Answer

120 mmHg is the systolic pressure, and 70 mmHg is the diastolic pressure.

Question 8

Which of the following best describes the function of platelets in the blood?

Accepted Answer

Platelets are fragments of cells involved in blood clotting.

Question 9

Which mechanism is primarily responsible for the return of blood to the heart in veins?

Accepted Answer

Contraction of skeletal muscles squeezes veins and pushes blood toward the heart.

Question 10

Which of the following is a consequence of atherosclerosis?

Accepted Answer

Plaques narrow arteries and interfere with circulation, increasing the risk of heart attack and stroke.

Question 11

Which respiratory pigment is responsible for oxygen transport in almost all vertebrates, and how many oxygen molecules can it bind?

Accepted Answer

Hemoglobin; it can bind four oxygen molecules.

Question 12

During exercise, the Bohr shift occurs. What is the effect of a drop in pH on hemoglobin’s affinity for oxygen?

Accepted Answer

A drop in pH lowers hemoglobin’s affinity for oxygen, causing more oxygen to be released to tissues.

Question 13

Which of the following best describes the process of negative pressure breathing in mammals?

Accepted Answer

Air is pulled into the lungs as the diaphragm and rib muscles contract, increasing lung volume.

Question 14

Which equation best represents cardiac output ($$CO) in $$humans?

Accepted Answer

$$CO = 	ext{Heart Rate} 	imes 	ext{Stroke Volume}$$

Question 15

Which of the following is a function of plasma proteins in blood?

Accepted Answer

Plasma proteins influence blood pH, osmotic pressure, and viscosity.

Question 16

Which of the following statements about the lymphatic system is correct?

Accepted Answer

The lymphatic system returns fluid to the body from the capillary beds and aids in body defense.

Question 17

Which of the following is a real-world consequence of hemophilia?

Accepted Answer

Excessive bleeding from minor cuts due to defects in the clotting process.

Question 18

Which of the following best describes the role of the sinoatrial (SA) node in the heart?

Accepted Answer

The SA node sets the rate and timing at which cardiac muscle cells contract.

Question 19

Which of the following is a direct effect of exercise on the cardiovascular system?

Accepted Answer

Exercise increases heart rate and cardiac output to supply additional oxygen to the body.

Circulation and Gas Exchange: Structure, Function, and Regulation in Animals

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