Quiz 3

Question 1

Cardiac cycle is

Answer 1

all the events associated with one heart beat caused by a wave of depolarization through the heart. starts in the atria- brief pause- followed by the ventricles

Question 2

contraction of the ventricles is

Answer 2

systole

Question 3

relaxtion of the ventricles is

Answer 3

diastole

Question 4

Na+ into cells is

Answer 4

depolarization (towards positive lead)

Question 5

K+ out of cells is

Answer 5

repolarization (away from positive lead)

Question 6

cardiac depolarization starts in the

Answer 6

right atrium (SA node)

Question 7

bundle brances

Answer 7

depolariation continues to the ventricles from the atria through bundle brancjes

Question 8

Explain why HR differs between pre-exercise and post-excercise sitting states

Answer 8

excercise: Hr Increases bc body needs more O2 and nutrients to be delivered
post exercise: body works to repay O2 debt, removes metabolic waste products, restores homeostasis (EPOC: post excercise oxygen consumption)

Question 9

differences in HR with respuratory cycle

Answer 9

inhalation: decreased thoracic pressure causes increased venus return to the heart and increased HR

exhalation: increased thoracic pressure, decreased venus return to heart and HR

Question 10

Duration between systole and diastole during post excercise is

Answer 10

shorter

Question 11

ECG intervals during excercise causes

Answer 11

reduction in interval durations, particualrly RR intervals

Question 12

is amplitude of waves consistent in different cardiac cycles

Answer 12

yes

Question 13

effect of para and symp activity on the heart

Answer 13

PARA: decreases heart contractility and conduction velocity

SYMP: Increases heart contractility and conduction velocity

Question 14

waves representing the atria contracting (before the ventricles)

Answer 14

P waves

Question 15

Which EKG waves represent the largest movement of sodium ions

Answer 15

QRS complex

Question 16

which wave represents the largest movement of K+ ions

Answer 16

repolarization phase of action potential

Question 17

Name all the structures of the cardiac conduction system in order, starting w normal pacemaker

Answer 17

1. SA node
2. AV Node
3. Bundle of His (AV bundle)
4. R and L bundle branches
5. purkinje fibers

Question 18

ventricular systrole sound

Answer 18

S1 “lub”

Question 19

early ventricular diastole

Answer 19

S2 “Dub”

Question 20

What branches from the L coronary artery?

Answer 20

-Anterior interventricular artery

-circumflex artery

Question 21

What part of the heart does the anterior interventricular a. serve?

Answer 21

front of ventricles

Question 22

What part of the heart does the circumflex serve?

Answer 22

L atrium and back of L ventricle

Question 23

What branches from the R coronary a.

Answer 23

-R marginal a.

-posterior interventricular a.

Question 24

What part of the heart does the right marginal a. serve?

Answer 24

R side of heart

Question 25

What part of the heart does the posterior interventricular a. serve?

Answer 25

back of ventricles

Question 26

What part of the heart does the coronary sinus serve?

Answer 26

posterior heart

Question 27

what branches from the coronary sinus

Answer 27

-great cardiac vein -middle cardiac vein -small cardiac vein

Question 28

What part of the heart does the great cardiac vein serve?

Answer 28

anterior interventricular sulcus and left coronary groove

Question 29

What part of the heart does the middle cardiac vein serve?

Answer 29

posterior interventricular sulcus

Question 30

What part of the heart does the -small cardiac vein serve

Answer 30

r margin of heart

Question 31

what part of the heart do the anterior cardiac veins serve

Answer 31

front of heart