blood flow through the heart Flashcards
systole
contraction
diastole
relaxation
during systole blood cannot do what
during systole blood cannot enter or flow into a chamber
BLOOD CAN ONLY ENTER A CHAMBER DURING DIASTOLE
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
function of trabeculae carnea
reduce suction between ventricular walls during contraction and relaxation
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
finistrative capillaries
endothelial lining has very obvious gaps
1 cell thick
great for producing filtrate (not regulated)
what would cause an increase in pericardial fluid?
- 35 mL is the normal
- clogged lymph vessels (cardiac tamponade= sac full of too much fluid)
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
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
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
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
what controls the timing and coordination of these mechanisms?
- electrical events of the heart
- the nodes
