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4 Cardiovascular System Physiology Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Cardiovascular System Physiology, test your knowledge, and prepare for your next test or exam.

20 questions
01
Fill in the blank
1 point

The formed elements that defend the body against pathogens are .

02
True or false
1 point

Pulmonary arteries carry oxygen-poor blood from the heart toward the lungs.

  1. A

    True

  2. B

    False

03
Choose one
1 point

Which function of albumin helps keep fluid in the bloodstream?

  1. A

    It forms clots at sites of vessel damage.

  2. B

    It helps maintain the osmotic pressure that keeps fluid in the bloodstream.

  3. C

    It carries most of the blood's oxygen.

  4. D

    It initiates the electrical signal for each heartbeat.

04
Choose one
1 point

What directly causes heart valves to open and close in a way that helps prevent backflow?

  1. A

    They actively pump blood using contractions of their own muscle.

  2. B

    They open only when the SA node sends them an electrical signal.

  3. C

    They respond to pressure differences to support one-way blood flow.

  4. D

    They prevent blood from entering the heart during diastole.

05
Fill in the blank
1 point

Blood returning from the lungs first enters the .

06
Choose one
1 point

A ventricle beats at 80 beats per minute and ejects 60 mL per beat. Using CO=HR×SV\text{CO}=\text{HR}\times\text{SV}, what is its cardiac output?

  1. A

    140 mL/min

  2. B

    1,200 mL/min

  3. C

    4,800 mL/min

  4. D

    8,000 mL/min

07
Written response
1 point

Which structure normally sets the pace by initiating each heartbeat?

08
Choose all
1 point

Select all statements that accurately describe local control of blood flow to active tissues.

  1. A

    Active tissues can release chemical signals that dilate nearby arterioles.

  2. B

    Local dilation can increase blood flow to tissues with greater metabolic demand.

  3. C

    Local tissue signals always constrict nearby arterioles to reduce flow.

  4. D

    During exercise, local control can help direct more blood to working skeletal muscle.

09
Written response
1 point

Which blood vessels are major resistance vessels that adjust their diameter to help direct blood into different tissues?

10
True or false
1 point

At rest, the right and left ventricles pump approximately equal volumes of blood over time.

  1. A

    True

  2. B

    False

11
Choose all
1 point

Select all factors identified as especially important determinants of stroke volume.

  1. A

    Preload, or how much the ventricle fills before contraction

  2. B

    Contractility, or the strength of contraction at a given filling level

  3. C

    Afterload, or the pressure or resistance the ventricle must overcome to eject blood

  4. D

    The oxygen concentration in the air entering the lungs

12
Choose one
1 point

How can contraction of nearby skeletal muscles help circulation in the limbs?

  1. A

    Skeletal muscle contractions push arterial blood away from the heart.

  2. B

    Contraction of nearby skeletal muscles helps move venous blood toward the heart.

  3. C

    Skeletal muscles replace the valves in every vein.

  4. D

    Skeletal muscle contractions stop blood from flowing through limb veins.

13
Open ended
1 point

A person's arterial blood pressure falls. Explain how the rapid baroreceptor reflex can respond, from sensing the pressure change to the cardiovascular effects that help restore pressure.

14
True or false
1 point

True or false: A blood vessel is classified as an artery because it carries oxygen-rich blood.

  1. A

    True

  2. B

    False

15
Choose one
1 point

Which role of albumin helps limit fluid from leaving the bloodstream?

  1. A

    It carries most of the blood's oxygen.

  2. B

    It helps maintain osmotic pressure in the bloodstream.

  3. C

    It initiates the electrical signal for each heartbeat.

  4. D

    It forms the thin walls of capillaries.

16
Choose one
1 point

Which feature makes capillaries especially suited for exchange between blood and tissues?

  1. A

    Their muscular walls maintain high pressure between heartbeats.

  2. B

    Their valves prevent blood from flowing back toward the heart.

  3. C

    Their thin walls permit exchange of gases, nutrients, and wastes.

  4. D

    Their smooth muscle directs blood away from the heart.

17
Written response
1 point

Which heart structure briefly delays the electrical signal after it spreads across the atria and before it travels through the ventricles?

18
Written response
1 point

A person's heart rate is 8585 beats per minute and stroke volume is 6060 mL per beat. Using CO=HR×SV\text{CO} = \text{HR} \times \text{SV}, what is the cardiac output in mL/min?

19
Choose one
1 point

What explains how heart valves help maintain one-way blood flow?

  1. A

    Pressure differences cause them to open and close, helping prevent backflow.

  2. B

    They contract actively to push blood through each chamber.

  3. C

    They generate the electrical signal that initiates each heartbeat.

  4. D

    They direct blood according to its oxygen content.

20
Choose one
1 point

Why does the left ventricle have a thicker muscular wall than the right ventricle?

  1. A

    It receives blood directly from the body and must withstand the highest return pressure.

  2. B

    It pumps blood through the pulmonary circuit, which requires greater pressure than systemic circulation.

  3. C

    It must contract before the right ventricle to open the pulmonary valve.

  4. D

    It must generate enough pressure to drive blood through systemic circulation.