Heart Test 2

Question 1

how many quarts of blood is in the body

Answer 1

6 quarts

Question 2

how long does it take to replace the body’s supply of blood?

Answer 2

one day

Question 3

The atrial cells beat about… per minute

Answer 3

60 times

Question 4

operation of the AV Valves

Answer 4

• causes heart muscle depolarization in only one direction from the atria to the venticles

Question 5

AV valve contraction rate

Answer 5

75 beats per min
enables the heart beat as a coordinated unit

Question 6

when the valves contract what does it do?

Answer 6

effectively ejects blood superiority into the large arteries leaving the heart

Question 7

what is electrocardiography?

Answer 7

the clinical procedure for mapping the electrical activity of the heart

Question 8

when atria relaxes…

Answer 8

ventricles contract

Question 9

systole

Answer 9

contraction

Question 10

diastole

Answer 10

relaxation

Question 11

explain the cardiac cycle

Answer 11

• both atria and ventricles contract and then relax
• length of this cycle is 0.8 seconds based on the average heart beating 75 times per minute

Question 12

three periods of the cardiac cycle

Answer 12

mid-to late diastole
ventricular systole
early diastole

Question 13

what happens during ventricular systole?

Answer 13

contraction begins
-pressure within the ventricles increases rapidly
- av valves close creating the first heart sound
LUB

Question 14

What happens during early diastole?

Answer 14

systole ends, ventricles relax
- semilunar valves snap shut and create the second heart sound DUB

Question 15

What is Cardiac Output?

Answer 15

the amount of blood pumped out by each side of the heart (actually each ventricle) in one minute

Question 16

cardiac output is the product of the…

Answer 16

heart rate and stroke volume

Question 17

average adult cardiac output

Answer 17

75 beats/min x 70 ml/beat
5250 ml/min

Question 18

as the heart beats, blood is propelled into the…

Answer 18

large arteries leaving the heart

Question 19

what is the tunica interna?

Answer 19

lines the lumen cavity
- interior of the vessels
- thin layer of the endothelium (squamous epithelial cells) resting on a scanty layer of loose connective tissue

Question 20

what is the tunica media?

Answer 20

bulky middle coat made up of smooth muscle and elastic tissue
- some of the larger arteries have elastic laminae
- complete sheets of elastic tissue in addition to the scattered elastic fibers

Question 21

what are capillary beds?

Answer 21

the tiny interweaving network of capillaries

Question 22

microcirculation is

Answer 22

the flow of blood from an arteriole to a venule that is through a capillary bed.

Question 23

(capillary bed) Vascular shunt

Answer 23

a vessel that directly connects the arteriole to the venule at opposite ends of the bed

Question 24

Capillary bed - precapillary sphincter

Answer 24

surrounds the root of each true capillary and acts as a valve to regulate the flow of blood into the capillary

Question 25

two routes blood flowing though a terminal arteriole

Answer 25

1. through the true capillaries 2. through the shunt

Question 26

when sphincters are relaxed

Answer 26

blood flows through the true capillaries and takes part in exchanges with tissue cells"

Question 27

when sphincters are contracted

Answer 27

blood flows through the shunts and bypasses the tissue cells