Cardiac cycle and conduction

Question 1

Cardiac cycle made of two alternating states, __ and __

Answer 1

systole; diastole

Question 2

In cardiac cycle, this means contraction

Answer 2

systole

Question 3

In cardiac cycle, this means relaxation

Answer 3

diastole

Question 4

____% passes from atrium to ventricle passively

Answer 4

70

Question 5

Three steps to cardiac style

Answer 5

1. atrial systole/ventricular diastole
2. ventricular systole/atrial diastole
3. brief moment of nothing

Question 6

valves open and close in the heart due to changes in __

Answer 6

pressure

Question 7

During atrial systole, the ____ valves are open and the ___ valves are closed

Answer 7

AV; semilunar

Question 8

During ventricular systole, the ____ are open and the ___ are closed

Answer 8

semilunar; AV

Question 9

pacemaker of the heart

Answer 9

SA (sinoatrial) node

Question 10

what are the 7 stops of impulses through the heart?

Answer 10

1. SA node
2. Atrial syncytium
3. Junctional fibers
4. AV node
5. AV bundle (Bundle of His)
6. Bundle branches
7. Purkinje fibers

Question 11

this structure in the cardiac cycle delays passing on the impulse until the atria have finished contracting

Answer 11

AV node

Question 12

these structures in the cardiac cycle spreads impulses to the ventricular wall and causes the ventricles to contract

Answer 12

Purkinje fibers

Question 13

these structures in the cardiac cycle divide into left and right pathways down the septum

Answer 13

bundle branches

Question 14

Answer 14

A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers

Question 15

What is an ECG?

Answer 15

Recording of electrical changes that occur during cardiac cycle

Question 16

3 parts of ECG

Answer 16

1. P wave
2. QRS complex
3. T wave

Question 17

In this section of an ECG, the atria depolarize

Answer 17

P wave

Question 18

In this part of an ECG, the ventricles depolarize and the atria repolarize

Answer 18

QRS

Question 19

In this part of an ECG, the ventricles repolarize

Answer 19

T

Question 20

What is happening during the first heart sound?

Answer 20

Ventricular systole - AV valves close

Question 21

What is happening during the second heart sound?

Answer 21

Semilunar valves close

Question 22

what is a heart murmur?

Answer 22

abnormal heart sound; happens because of valve damage

Question 23

As blood is pushed out of the heart, what happens to ventricular pressure?

Answer 23

Increases

Question 24

As blood gets pushed out of the heart, what happens to ventricular volume?

Answer 24

Decreases

Question 25

What is the average adult heart rate?

Answer 25

70-75

Question 26

When a person’s heart rate is over 100 bpm, it’s called

Answer 26

tachycardia

Question 27

When a person’s heart rate is below 60, it’s called

Answer 27

bradycardia

Question 28

How does an increased body temperature affect heart rate?

Answer 28

Increeas

Question 29

condition where there is too much K+; decreases heart rate and force contraction; can be life-threatening

Answer 29

Hyperkalemia

Question 30

condition where there is too much Ca+; increases heart rate

Answer 30

hpercalcemia

Question 31

condition where there is too little calcium; decreases heart rate

Answer 31

hypocalcemia