PHYSIOLOGY

Question 1

What is the spherical cow model?

Answer 1

The most simplified model of the cardiovascular system , 1 vein 1artery, lungs are excluded, non pulsating flow, linear pressure excluded ( poiuselles applies) (because too hard to model)

Question 2

When can the spherical cow model be applied?

Answer 2

. Spherical cow model can be applied when the heart stop. There is still flow until the hydrostatic pressure is equalised and still hydrostatic pressure.

Question 3

What is starlings Law

Answer 3

Heart strength depends on venous return- the more blood is returned to the heart the

Question 4

What is compliance?

Answer 4

Compliance is change in volume over change in pressure (gradient)

Question 5

What is unstressed volume?

Answer 5

The amount of water that an be filled without the walls expanding and enlarging

Question 6

Resting membrane potential?

Answer 6

a) It arises because of the negatively charged proteins on the inside of the cell creating a negative charge
b) -70 mV because of the difference of permeability. The nerst equation has the theoretical value of -90mV but this is different because the permeability of the ions is taken into account
By altering the concentrations