ch 19 pt 4

Question 1

Beats per minute

Answer 1

60-100

Question 2

What is coronary circulation?

Answer 2

Delivers blood to hearts thick wall

Question 3

Coronary arteries transport what?

Answer 3

Oxygenated blood to heart wall

Question 4

Coronary veins transport what?

Answer 4

Deoxygenated blood away from heart wall toward right atrium

Question 5

What is circumflex artery?

Answer 5

Wrap arounds and supplies left atrium and ventricle

Question 6

What is anastomoses?

Answer 6

Connection between blood vessels

Question 7

What do coronary sinus do?

Answer 7

Receives blood from cardiac veins and drains into right atrium

Question 8

What is conduction system?

Answer 8

Conducts electrical event ensuring contraction

Question 9

What does the Nodal cell in SA node do?

Answer 9

Initiates heartbeat

Question 10

What is parasympathetic innervation?

Answer 10

Decreases heart rate, cardioinhibitory center, vagus nerve

Question 11

What is sympathetic innervation?

Answer 11

Increases heart rate and force of contraction, cardioacceleratory center, T-1,T-5

Question 12

What is the conduction system?

Answer 12

Initiates and propagates an action potential

Question 13

What is cardiac muscle cells?

Answer 13

Fire action potentials and contract after conduction system

Question 14

RMP is

Answer 14

-60mV

Question 15

Threshold value is

Answer 15

-40mV and Na+ flows

Question 16

Depolarization is

Answer 16

0mV and Ca2+ flows

Question 17

Repolarization is

Answer 17

-60mV and K+ flows