pulmonary artery takes blood to the lungs --> to get more oxygen
pulmonary vein = only vein with oxygenated blood (back from lungs)
pulmonary artery = only artery to carry deoxygenated blood
aorta = extremely high pressure
no valves = blood pressure so high backflow cannot happen
left side = thicker muscles --> to pump blood further around body + at higher pressure
right side = thinner muscles --> only has to pump blood to lungs (close) + not so high pressure
vena cava = vein
atria = plural for atrium
Vena cava -> right atrium -> right ventricle -> pulmonary artery -> lungs -> pulmonary vein -> left atrium -> left ventricle -> aorta -> around body organs -> back to vena cava
blood becomes deoxygenated due to respiring organs (O2 = aerobic respiration = ATP)
systematic circuit = whole body
pulmonary circuit = lungs
Atria & Ventricles contract -> high pressure -> open/close valves
blood gets reoxygenated from the oxygen in the alveoli in the lungs
muscle contracts = increasing pressure
heart = muscle
double circulatory system = blood passes through heart twice in one cycle
REASON FOR DOUBLE CIRC SYS = blood enters lungs: decreased blood pressure for diffusion in alveoli -not enough pressure to travel through whole body -> back to heart so pressure can increase
systematic circuit = higher pressure ( left = thicker walls can pump b further)
Aorta -> coronary arteries : provide heart muscle with oxygenated blood = can carry out resp + produce ATP to contract
label this heart:
A) vena cava
B) pulmonary vein
C) pulmonary artery
D) aorta
E) left ventricle
F) left atrium
G) right atrium
H) right ventricle
I) tricuspid valve
J) bicuspid valve
K) semi-lunar valves
L) right
M) left
why does the left ventricle have a thicker muscle wall than the right ventricle?
to pump blood further around the body at a higher pressure
why is the right ventricle's muscle wall thinner?
it transports blood to lungs, which is a shorter distance than what the left ventricle transports blood to - the entire body - so needs less pressure
why is the blood pumped in the systematc circuit at a higher pressure than the pulmonary circuit?
the thicker muscle walls of the left ventricle allow blood to be pumped at a further distance and higher pressure