4.3 Physiology of the Cardiovascular System Part 3

Question 1

What is heart rate?

Answer 1

number of beats per minute

Question 2

What are the two main neurotransmitters that help regulate heart rate?

Answer 2

norepinephrine
acetylcholine

Question 3

Where do the electrical impulses of the heart begin?

Answer 3

sinoatrial node

Question 4

Where is the SA node?

Answer 4

right atrium

Question 5

What is known as the pacemaker of the heart?

Answer 5

SA node

Question 6

What is the SA node?

Answer 6

small mass of specialized cardiac muscle that contains cardiac and nervous tissue characteristics

Question 7

What happens once the electrical impulse is started at the SA node?

Answer 7

spreads throughout the atria creating the left and right atrial systole

Question 8

Where does the electrical impulse travel after the atria?

Answer 8

AV node

Question 9

What is the AV node also known as?

Answer 9

bundle of His

Question 10

Where does the impulse travel after the AV node?

Answer 10

towards the ventricular apex (down point of the heart)

Question 11

Where does the electrical impulse travel after the ventricular apex?

Answer 11

purkinje fibers causing the left and right ventricles to contract

Question 12

What is an EKG?

Answer 12

electrocardiogram

Question 13

What is the purpose of an EKG?

Answer 13

device used to measure electrical impulses in the heart

Question 14

What is atrial depolarization?

Answer 14

active firing of a nerve impulse

Question 15

What is detonated by the P wave on the EKG?

Answer 15

atrial depolarization and atrial systole

Question 16

What is represented by the QRS complex of an EKG?

Answer 16

ventricular depolarization and ventricular systole

Question 17

What is denoted by the T wave on an EKG?

Answer 17

ventricular diastole and ventricular repolarization

Question 18

Is there a way to note atrial repolarization on an EKG?

Answer 18

no; it is lost in the QRS wave