The heart (scheurink)

Question 1

open blood circulation

Answer 1

no difference between blood and extracellular fluid

Question 1

closed blood circulation

Answer 1

transport, regulation and immune system

Question 2

ventricular relaxation

Answer 2

diastole, semilunar valves closed, opened mitral valve

Question 3

ventricular contraction

Answer 3

systole, semilunar valves opened, closed AV valves

Question 4

sinoatrial node

Answer 4

pacemaker of the heart

Question 5

late diastole

Answer 5

both sets of chambers are relaxed and ventricles fill passively

Question 6

atrial systole

Answer 6

atrial contraction forces a small amount of additional blood into the ventricles

Question 7

isovolumic ventricular contraction

Answer 7

first phase of ventricular contraction, pushes AV valves closed but does not create enough pressure to open semilunar valves

Question 8

ventricular ejection

Answer 8

ventricular pressure rises so the semilunar valves open and blood is ejected

Question 9

isovolumic ventricular relaxation

Answer 9

as ventricles relax, pressure in ventricles falls. blood flows back into cusps of semilunar valves and snaps them closed

Question 10

cardiac output

Answer 10

strength of contraction + heart rate

Question 11

baroreceptor complex

Answer 11

important in providing a constant blood flow to the brain (to avoid fainting)