Cardiovascular system haemodynamics and cardiac muscle

Question 1

what is systematic circulation

Answer 1

there is not enough blood to fully support the needs of every tissue so blood must be directed to where it is needed

Question 2

what is Darcy’s Law

Answer 2

flow = pressure difference/resistance

Question 3

how do you work out resistance

Answer 3

resistance = 8Ln/Pir4
L = length
N= viscosity
Pi = 3.14
r = Radius
4 = to the power of 4

Question 4

what things can be ignored in the equation to work out resistance

Answer 4

8/Pi, Viscosity, length

Question 5

what does the parasympathetic NS do

Answer 5

rest and digest - slows down heart

Question 6

what does the sympathetic NS do

Answer 6

fight or flight - speed up

Question 7

what are the two abbreviations of cardiac output

Answer 7

CO, the correct one is a Q with a . over it

Question 8

what are the units of cardiac output

Answer 8

ml/min-1

Question 9

what are the typical values at rest of an untrained person of cardiac output, heart rate, stroke volume, peak exercise

Answer 9

cardiac output - 5.6
heart rate - 70
stroke volume - 80
peak exercise - 20

Question 10

what happens when people train more

Answer 10

heart rate decreases and stroke volume increases

Question 11

what is the frank starling mechanism

Answer 11

end-diastolic volume can be increased by greater filling of the heart. stretching cardiac muscle fibers causes them to contract more forcefully.