1A Circulatory System

Question 1

important properties of water

Answer 1

Dipole
Cohesive- helps to flow/transport
Good solvent

Question 2

why do large organisms need mass transport systems

Answer 2

large distance for travel- diffusion rate is low
SA:Volume ratio is low

Question 3

Vein structure n function

Answer 3

Transport blood to the heart
large lumen
thin muscle wall
low pressure
valves to prevent backflow

Question 4

artery structure and function

Answer 4

carry blood away from the heart
small lumen
thick muscle wall
high pressure
folded endothelium-withstand high pressure

Question 5

capillary structure and function

Answer 5

one cell thick endothelium- facilitate fast diffusion
smallest vessel

Question 6

how do valves work

Answer 6

when there is more pressure in front of the valve than behind the valve stays closed.
when there is more pressure behind the valve opens

Question 7

Order of systole/diastole

Answer 7

1.Atrial systole, ventricular diastole
2. ventricular systole atrial diastole
3.cardiac diastole

Question 8

Cardiac cycle steps

Answer 8

atria contract in systole, increasing pressure opening the AV valves, blood moves into the ventricles
ventricles contract in systole, pressure increases. AV valves close, semilunar valves open, blood moves into the arteries.
the ventricles and atria relax, SL valves close, atria fill. AV valves open, ventricles fill passively.
repeat