blood flow through the heart Flashcards Preview

Human Body Lecture > blood flow through the heart > Flashcards

Flashcards in blood flow through the heart Deck (13):
1

systole

contraction

2

diastole

relaxation

3

during systole blood cannot do what

during systole blood cannot enter or flow into a chamber
BLOOD CAN ONLY ENTER A CHAMBER DURING DIASTOLE

4

job of the auricle

increase the volume of blood that can be collected by the atrium
-this is especially helpful during intense exercise when venous return to the heart increases substancially

5

function of trabeculae carnea

reduce suction between ventricular walls during contraction and relaxation

6

pulmonary arteries are unlike any other artery in the body in that they carry what type of blood

they carry deoxygenated blood
-all other arteries carry oxygenated blood

7

finistrative capillaries

endothelial lining has very obvious gaps
1 cell thick
great for producing filtrate (not regulated)

8

what would cause an increase in pericardial fluid?

-35 mL is the normal
-clogged lymph vessels (cardiac tamponade= sac full of too much fluid)

9

why is the bicuspid valve stronger

it has only two flaps making it stronger protecting against the actual contraction of the left side of the heart

10

what would happen if one of the atrioventricular valves failed?

you would no longer be able to generate enough pressure
-blood flows in the path of least resistance

11

why do the vessels emerging from the base of the heart have pressure associated with them?

-elasticity (snap back of aorta) pulmonary trunk also has elastic fibers
-due to blood itself causing pressure

12

what if the atrioventricular valves failed during contraction? where does the blood go or what happens to cardiac output?

-blood would go back into the atria when the ventricles contract
-it would be able to create enough pressure for cardiac output

13

what controls the timing and coordination of these mechanisms?

-electrical events of the heart
-the nodes