Q: A patient has a blood pressure of 120/80 mmHg. What is their pulse pressure, and what does this value represent?

$$\text{Pulse Pressure} = \text{Systolic Pressure} - \text{Diastolic Pressure} = 120\ \mathrm{mmHg} - 80\ \mathrm{mmHg} = 40\ \mathrm{mmHg}$$; it represents the force the heart generates with each contraction

Question 1

A red blood cell travels from the right atrium through the systemic circuit and returns to the heart. Which of the following correctly lists the sequence of major structures it passes through, starting from the right atrium?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle → Aorta → Systemic arteries → Systemic veins → Right atrium

Question 2

Which of the following is an exception to the rule that the systemic and pulmonary circuits are arranged in parallel?

Accepted Answer

The hepatic portal circulation, where blood from the gastrointestinal tract passes through the liver before returning to the heart

Question 3

Which of the following correctly matches a layer of the heart with its function?

Accepted Answer

Myocardium: responsible for the contractile force that pumps blood

Question 4

Which statement best explains why veins have valves but most arteries do not?

Accepted Answer

Valves in veins prevent backflow of blood due to lower pressure, especially in the limbs

Question 5

What is the primary function of the pericardium?

Accepted Answer

To reduce friction between the heart and surrounding structures during contraction

Question 6

Which of the following best describes the role of pacemaker cells in the heart?

Accepted Answer

They spontaneously generate action potentials that initiate each heartbeat

Question 7

A patient has a blockage at the atrioventricular (AV) node. Which of the following is the most likely effect on the heart's electrical conduction?

Accepted Answer

The ventricles will contract at a slower, independent rate from the atria

Question 8

During the cardiac action potential, which phase is primarily responsible for the rapid depolarization of ventricular muscle cells?

Accepted Answer

Phase 0, due to the rapid influx of $$\mathrm{Na^+}$$ ions

Question 9

Which of the following best describes the refractory period in cardiac muscle?

Accepted Answer

It prevents tetanus by ensuring the heart muscle cannot be re-excited until contraction is complete

Question 10

A patient has a blood pressure of 120/80 mmHg. What is their pulse pressure, and what does this value represent?

Accepted Answer

$$	ext{Pulse Pressure} = 	ext{Systolic Pressure} - 	ext{Diastolic Pressure} = 120\ \mathrm{mmHg} - 80\ \mathrm{mmHg} = 40\ \mathrm{mmHg}$$; it represents the force the heart generates with each contraction

Question 11

Which of the following best explains the difference between systolic and diastolic pressure?

Accepted Answer

Systolic pressure is the maximum arterial pressure during ventricular contraction; diastolic pressure is the minimum arterial pressure during ventricular relaxation

Question 12

Which formula correctly calculates cardiac output, and what does each variable represent?

Accepted Answer

$$	ext{Cardiac Output} = 	ext{Heart Rate} 	imes 	ext{Stroke Volume}$$, where heart rate is beats per minute and stroke volume is the volume of blood pumped per beat

Question 13

A patient has an end-diastolic volume (EDV) of 120 mL and an end-systolic volume (ESV) of 50 mL. What is their stroke volume (SV)?

Accepted Answer

$$	ext{SV} = 	ext{EDV} - 	ext{ESV} = 120\ \mathrm{mL} - 50\ \mathrm{mL} = 70\ \mathrm{mL}$$

Question 14

Which of the following best describes the ejection fraction and its clinical significance?

Accepted Answer

$$	ext{Ejection Fraction} = \frac{	ext{SV}}{	ext{EDV}} 	imes 100\%$$; it indicates the percentage of blood ejected from the ventricle with each beat and is used to assess heart function

Question 15

If a patient’s heart rate increases but their stroke volume remains constant, what will happen to their cardiac output?

Accepted Answer

Cardiac output will increase, since $$	ext{CO} = 	ext{HR} 	imes 	ext{SV}$$

Question 16

Which of the following is an example of an extrinsic factor that can increase heart rate?

Accepted Answer

Release of epinephrine from the adrenal medulla during stress

Question 17

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of the ventricular muscle (preload), the greater the force of contraction

Question 18

Which of the following best distinguishes between preload and afterload?

Accepted Answer

Preload is the initial stretching of cardiac muscle fibers before contraction; afterload is the pressure the heart must overcome to eject blood

Question 19

Which of the following best describes the function of the lymphatic system in relation to the cardiovascular and immune systems?

Accepted Answer

It returns excess interstitial fluid to the bloodstream and provides sites for immune cell activation

Study Notes: The Cardiovascular System – Cardiac Function

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