Ch 20: Continued

Question 1

What happens when there is an increase pressure in the atrium

Answer 1

The atrium is open which allows ventricles to relax for blood flow 
-ventricular diastole

Question 2

What happens when there’s an increase in pressure of the ventricle

Answer 2

The AV valve closes and the aortic semi lunar valve opens
-Ventricular systole

Question 3

Diostole

Answer 3

Relaxation

Question 4

Systole

Answer 4

Contraction

Question 5

Blood pressure

Answer 5

systolic/diastolic

Question 6

Blood pressure units

Answer 6

MmHg

Question 7

What happens when any valve closes?

Answer 7

It produces a sound in the heart
-Lub- dub

Question 8

S1

Answer 8

AV valves are closed

Question 9

S2

Answer 9

Aortic semi lunar valves are closed

Question 10

Definition of isovolumetric

Answer 10

Same volume
-All four valves are closed

Question 11

When does isovolumic occur?

Answer 11

Occur shortly before valves are open in right before contraction

Question 12

S3

Answer 12

Passive filing a ventricle

Question 13

S4

Answer 13

Pathologically

Question 14

EDV

Answer 14

Volume is measured at the end of diastole

Question 15

ESV

Answer 15

Volume is measured at the end of the systole

Question 16

Actively filing a ventricle

Answer 16

Atrium contracts, ventricles are relaxed, and AV is open

Question 17

Blood flow through the heart

Answer 17

1. Blood comes from Superior and inferior Venna cava to right atrium from tricuspid valve.
2. Blood flows from right ventricle through pulmonary semilunar valve.
   3 blood flows to the pulmonary trunk.
3. From the pulmonary trunk, it goes to the pulmonary arteries. (Lungs)
4. Blood from the lungs goes to pulmonary veins.
5. From the vans flows to the left atrium through the bicuspid valve.
6. From the valve, it flows to the left ventricle through the aortic semilunar valve to the aorta.
7. From the aorta, it goes to coronary and systemic circuits to the coronary sinus and cardiac veins. Then back to right atrium.

Question 18

Arteries in the right side of the coronary artery

Answer 18

1. Right marginal artery.
2. Posterior interventricular artery.

Question 19

Arteries on the left coronary artery

Answer 19

1. Anterior interventricular artery.
2. Circumflex artery.
3. Left marginal artery.

Question 20

Two arteries that causes heart attacks

Answer 20

1. MI - left marginal artery.
2. Posterior interventricular artery.

Question 21

Conducting cells

Answer 21

Electrical system of the heart

Question 22

Contractile cells

Answer 22

Contracting property of the heart

Question 23

Action potential in cardiac muscle

Answer 23

Action potential is slow because of gap junctions
1. Increase in Na+ channels, K+ channels are closed.
2. Early repolarization phase
3. Voltage Ca2+ channels are open with influx of Ca2+
-K+ channels are open to counter influx of Ca2+
4. Na+ is open, K+ is closed, Ca2+ begins to open

Question 24

Electrical pathway of heart

Answer 24

1. Sino atrial node.
2. Atrioventricular node.
3. Atrioventricular bundle.
4. Left and right bundle branches.
5. Purkinje fibers.

Question 25

Sino atrial node

Answer 25

-Hearts natural pacemaker
-If SA node isn’t working, it’s replaced with artificial pacemaker

Question 26

P-wave

Answer 26

Atrial depolarization

Question 27

QRS complex

Answer 27

Ventricular depolarization
-Systolic

Question 28

T-wave

Answer 28

Ventricular repolarization

Question 29

PR interval

Answer 29

Atria contracts and begins to relax, ventricles begin to contract

Question 30

QT interval

Answer 30

Ventricles contract and begin to relax