Control And Order Of Heart Rate Including All The Nodes

Question 1

What is the primary function of the heart’s conduction system?

Answer 1

To control the heart rate and coordinate the contraction of heart muscles.

Question 2

Which node is known as the natural pacemaker of the heart?

Answer 2

Sinoatrial (SA) node.

Question 3

True or False: The atrioventricular (AV) node is located in the right atrium.

Answer 3

False.

Question 4

Fill in the blank: The __________ node is responsible for delaying the electrical signal before it enters the ventricles.

Answer 4

Atrioventricular (AV)

Question 5

What is the role of the Bundle of His?

Answer 5

To conduct impulses from the AV node to the ventricles.

Question 6

Where are the Purkinje fibers located?

Answer 6

In the walls of the ventricles.

Question 7

Multiple Choice: Which structure has the highest rate of depolarization?

Answer 7

A) SA node

Question 8

What effect does the sympathetic nervous system have on heart rate?

Answer 8

It increases heart rate.

Question 9

What effect does the parasympathetic nervous system have on heart rate?

Answer 9

It decreases heart rate.

Question 10

True or False: The heart rate can be influenced by hormones such as adrenaline.

Answer 10

True.

Question 11

What is the normal resting heart rate range for adults?

Answer 11

60 to 100 beats per minute.

Question 12

Fill in the blank: The __________ node receives impulses from the SA node.

Answer 12

Atrioventricular (AV)

Question 13

What is the term for the electrical pathway that spreads impulses through the ventricles?

Answer 13

Purkinje system.

Question 14

Multiple Choice: Which of the following is not part of the conduction system of the heart? A) SA node B) AV node C) Aorta D) Bundle of His

Answer 14

C) Aorta

Question 15

What is the primary ion that influences cardiac action potentials?

Answer 15

Sodium (Na+).

Question 16

True or False: The heart can function independently of the nervous system.

Answer 16

True.

Question 17

What is the term for the period of time when the heart muscle is relaxing?

Answer 17

Diastole.

Question 18

What is the term for the period of time when the heart muscle is contracting?

Answer 18

Systole.

Question 19

Fill in the blank: The __________ system releases neurotransmitters that affect heart rate.

Answer 19

Autonomic

Question 20

What structure connects the atria and ventricles of the heart?

Answer 20

Atrioventricular (AV) bundle.

Question 21

True or False: The heart’s conduction system is composed entirely of nervous tissue.

Answer 21

False.

Question 22

What is the resting membrane potential of cardiac pacemaker cells?

Answer 22

-60 mV.

Question 23

Multiple Choice: Which ion is primarily responsible for depolarization in cardiac action potentials? A) Calcium B) Sodium C) Potassium D) Chloride

Answer 23

B) Sodium

Question 24

What is the function of the vagus nerve in heart rate control?

Answer 24

To decrease heart rate.

Question 25

Fill in the blank: The __________ node initiates the electrical impulse that starts each heartbeat.

Answer 25

Sinoatrial (SA)