Cardiovascular system

capillaries

tiny vessels that facilitate the exchange of gases, proteins, liquid with tissues

R atrium, R ventricle, L atrium, L ventricle

4 chambers of the heart

mono-nucleated, dense

Cardiac muscle is ___ and ___ with mitochondria.

systolic

contraction, sending blood out

diastolic

relaxation, filling

isovolumic relaxation (ventricular diastole)

SL vales close at end of ejection stage, blood flow stops

ventricle filling

ventricles and atria relax and expand, blood flows to the heart via vena cava and pulmonary veins

atrial contraction

ventricles relaxed and expanded, atrial contraction (atrial systole) forces blood into ventricles

isovolumic contraction (ventricular contraction)

AV valves close at end of ventricular diastole, blood flow stops, ventricles begin to contract

ventricular ejection

ventricles contract, blood flows from the heart, high pressure

isovolumic relaxation (ventricular diastole), ventricle filling, atrial contraction, isovolumic contraction (ventricular contraction), ventricular ejection

phases of the cardiac cycle

tricuspid, mitral

AV valves

pulmonary, aortic

SL valves