1 CVS Haemodynamics

Question 1

What are the resistance vessels?

Answer 1

Arterioles and pre capillary sphincters

Question 2

What are the capacitance vessels?

Answer 2

The veins, a store of blood that can be called upon to cope with temporary imbalance between the amount of blood returning to the heart and the amount required to pump out

Question 3

What is the difference between plasma and serum?

Answer 3

Fluid collected from unclotted blood is called plasma

Fluid collected from clotted blood is called serum

Question 4

What is peripheral resistance?

Answer 4

The resistance of the arteries to blood flow, as arteries constrict the resistance increases, as they dilate, resistance decreases.

Question 5

What are the two types of blood flow in the body?

Answer 5

Turbulence and laminar

Question 6

What is turbulent flow?

Answer 6

Blood flows in all directions and mixes within the vessel, can be described as chaotic, occurs when passes a rough surface or there is an increased resistance to blood flow

Question 7

What is pulse pressure?

Answer 7

Peak Systolic pressure - end diastolic pressure

120mmhg - 80mmHg = 40mmHg

Question 8

How can the mean arterial pressure be estimated?

Answer 8

Diastolic pressure + 1/3 of the pulse pressure

80mmHg + 13mmHg

Question 9

What is the strength of a pulse determined by?

Answer 9

• the force the left ventricle is able to eject blood

- the pulse pressure - the greater the pulse pressure the stronger the pulse?

Question 10

What do the words thread and bounding mean?

Answer 10

Thready - a weak pulse

Bounding - a strong pulse