Heart rate $$= \text{beats in 30 seconds} \times 2$$

Question 1

Which of the following best describes the path of blood flow in the mammalian heart, as illustrated in the figure-eight diagram?

Accepted Answer

Blood flows from the lungs to the heart, then to the body tissue capillaries, and returns to the heart before going back to the lungs.

Question 2

Which chamber of the heart receives deoxygenated blood from the systemic circuit?

Accepted Answer

Right atrium

Question 3

What is the function of the interventricular septum in the mammalian heart?

Accepted Answer

To prevent mixing of oxygenated and deoxygenated blood between the ventricles

Question 4

Which valve prevents backflow of blood from the left ventricle to the left atrium?

Accepted Answer

Bicuspid (mitral) valve

Question 5

During which phase of the ECG does ventricular contraction occur?

Accepted Answer

QRS-complex

Question 6

If a patient has a heart murmur, which of the following is most likely true?

Accepted Answer

There is a defect or damage in one of their heart valves causing blood to leak backwards.

Question 7

Which vessels carry blood toward the heart?

Accepted Answer

Veins

Question 8

What is the largest artery in the human body, and from which chamber does it receive blood?

Accepted Answer

Aorta; left ventricle

Question 9

Which of the following statements about blood pressure is correct?

Accepted Answer

Blood pressure in arteries fluctuates between systolic and diastolic values due to ventricular contractions.

Question 10

When measuring blood pressure with a sphygmomanometer, what does the first Korotkoff sound indicate?

Accepted Answer

Systolic pressure

Question 11

Which node generates the rhythmic impulses that set the heart rate?

Accepted Answer

Sinoatrial node

Question 12

Which of the following best explains why mammals have a double circulation system?

Accepted Answer

To separate oxygenated and deoxygenated blood and maintain high pressure in the systemic circuit

Question 13

Which chamber of the heart is three times thicker than the other, and why?

Accepted Answer

Left ventricle; because it pumps blood throughout the systemic circuit

Question 14

Which of the following equations correctly represents the calculation of heart rate if you count the number of beats in 30 seconds?

Accepted Answer

Heart rate $$= 	ext{beats in 30 seconds} 	imes 2$$

Question 15

Which part of the ECG corresponds to the relaxation of the ventricles?

Accepted Answer

T-wave

Question 16

If the pressure in the sphygmomanometer cuff is higher than the systolic pressure, what will you hear through the stethoscope?

Accepted Answer

No sound (silence)

Question 17

Which of the following is true about the pulmonary and systemic circuits in mammals?

Accepted Answer

Pulmonary circuit operates at low pressure, systemic circuit at high pressure.

Question 18

Which valve guards the entrance to the pulmonary artery?

Accepted Answer

Pulmonary semilunar valve

Question 19

Which vessels bring oxygenated blood back to the left side of the heart?

Accepted Answer

Pulmonary veins

Question 20

How many chambers does an amphibian heart have?

Accepted Answer

Three

The Structure and Function of the Mammalian Heart: Circulation, Heart Rate, ECG, and Blood Pressure

Study Guide - Practice Questions