anatomy and physiology

Question 0

leaflet

Answer 0

flat structure that comprises the valves of the heart

Question 1

autonomic nervous syster

Answer 1

regulated involuntary actions

Question 2

lumen

Answer 2

tubular space or channel within an organ

Question 3

regurgitation

Answer 3

ejecting of contents through an opening

Question 4

sphincter

Answer 4

circular muscle that constricts or dilates to regulate passage of substances

Question 5

vasoconstriction

Answer 5

narrowing of the lumen of a blood vessel that limits blood flow

Question 6

vasodilation

Answer 6

widening of the lumen of a blood vessel caused by the relaxing of the muscles of the vascular walls

Question 7

viscosity

Answer 7

state of being sticky or gummy

Question 8

arteries

Answer 8

carry blood from the heart

Question 9

tunica externa

Answer 9

outer coat of connective tissue

Question 10

tunica media

Answer 10

middle layer of smooth muscle

Question 11

tunica intima

Answer 11

thin inner lining of endothelial cells

Question 12

capillaries

Answer 12

microscopic vessels that join the arterial system with the venous system

Question 13

veins

Answer 13

return blood to the heart

Question 14

valves

Answer 14

small structures within veins that prevent backflip of blood

Question 15

pericardium

Answer 15

sac that contains heart; three layers

Question 16

endocardium

Answer 16

serous membrane that lines chambers of the heart

Question 17

myocardium

Answer 17

muscular layer of the heart

Question 18

epicardium

Answer 18

uttermost layer of the heart

Question 19

right and left atrium

Answer 19

collect blood; upper chambers

Question 20

right and left ventricle

Answer 20

pump blood from the heart; lower chambers

Question 21

superior vena cava

Answer 21

collects and carries blood from the upper body

Question 22

inferior vena cava

Answer 22

collects and carries blood from the lower body

Question 23

conduction tissue

Answer 23

initiates and spreads contraction impulses

Question 24

sinoatrial node

Answer 24

pacemaker of the heart

Question 25

sequence of a contraction impulse

Answer 25

SA node-AV node-bundle of His-Purkinje fibers

Question 26

P wave

Answer 26

depolarization of the atria

Question 27

QRS complex

Answer 27

depolarization of the ventricles

Question 28

At wave

Answer 28

repolarization of the ventricles