Control of heart rate

Question 1

What is the primary function of the heart?

Answer 1

To pump blood throughout the body.

Question 2

True or False: The heart rate is controlled solely by the nervous system.

Answer 2

False.

Question 3

Fill in the blank: The _____ node initiates the heartbeat.

Answer 3

sinoatrial (SA)

Question 4

What role does the atrioventricular (AV) node play in heart rate control?

Answer 4

It delays the electrical signal before it passes to the ventricles.

Question 5

Which part of the autonomic nervous system increases heart rate?

Answer 5

Sympathetic nervous system.

Question 6

What is the effect of the parasympathetic nervous system on heart rate?

Answer 6

It decreases heart rate.

Question 7

Identify the hormone that increases heart rate during stress.

Answer 7

Adrenaline (epinephrine).

Question 8

What is the term for the electrical conduction pathway in the heart?

Answer 8

Cardiac conduction system.

Question 9

True or False: Heart rate can be influenced by physical activity.

Answer 9

True.

Question 10

What is the normal resting heart rate range for adults?

Answer 10

60 to 100 beats per minute.

Question 11

Fill in the blank: The _____ system is responsible for the involuntary control of heart rate.

Answer 11

autonomic nervous

Question 12

What is tachycardia?

Answer 12

An abnormally fast heart rate, typically over 100 beats per minute.

Question 13

What is bradycardia?

Answer 13

An abnormally slow heart rate, typically below 60 beats per minute.

Question 14

Which structure in the heart is responsible for pumping blood to the lungs?

Answer 14

Right ventricle.

Question 15

What is the role of baroreceptors in heart rate control?

Answer 15

They detect changes in blood pressure and help regulate heart rate.

Question 16

True or False: Exercise has no effect on heart rate.

Answer 16

False.

Question 17

What is the relationship between heart rate and cardiac output?

Answer 17

Cardiac output is the product of heart rate and stroke volume.

Question 18

Fill in the blank: The _____ is the primary pacemaker of the heart.

Answer 18

sinoatrial (SA) node

Question 19

What effect does increased body temperature have on heart rate?

Answer 19

It typically increases heart rate.

Question 20

What is the function of the Purkinje fibers?

Answer 20

To distribute electrical impulses throughout the ventricles.

Question 21

What role does calcium play in heart muscle contraction?

Answer 21

Calcium ions are essential for the contraction of heart muscle fibers.

Question 22

True or False: The heart can generate its own electrical impulses.

Answer 22

True.

Question 23

What is the effect of caffeine on heart rate?

Answer 23

It usually increases heart rate.

Question 24

What does ECG stand for?

Answer 24

Electrocardiogram.

Question 25

What does an ECG measure?

Answer 25

The electrical activity of the heart.

Question 26

Fill in the blank: The _____ phase of the cardiac cycle is when the heart muscle relaxes.

Answer 26

diastole

Question 27

What is the cardiac cycle?

Answer 27

The sequence of events in one heartbeat, including contraction and relaxation of the heart.

Question 28

What can an increased heart rate indicate?

Answer 28

It can indicate stress, exercise, or medical conditions.