Heart

Question 1

How do you work out time for diffusion?

Answer 1

t = x^2/2D

t= distance for diffuse^2/ diffusion coefficient x 2

Question 2

What are the functions of the circulatory system?

Answer 2

To transport nutrients, maintain pH, maintain osmotic pressure, heat (temperature)

Question 3

How close does the circulation take nutrients to the cell?

Answer 3

10-20um of the cell

Question 4

Where is most of the blood found?

Answer 4

in the veins, venules and venous sinuses (64%)

Question 5

What are the three main components of a vessel wall?

Answer 5

Intima, media, adventitia

Question 6

What is the Adventitia?

Answer 6

The adventitia is the outer layer of the vessel wall. It consists of connective tissue produced by fibroblasts and gradually merges with the surrounding connective tissue

Question 7

What is Vasa vasorum?

Answer 7

blood vessels in arterial wall

Question 8

What is Nervi vascularis?

Answer 8

Nerve endings on vascular smooth muscle

Question 9

What is the media?

Answer 9

The media in the middle layer of the vessel wall. It is made up of circular smooth muscle cells and contains elastic fibres and collagen to make vessel walls flexible

Question 10

What is the intima?

Answer 10

The intima is the inner most layer of the vessel wall. It is made up of endothelial cells surrounded by subendothelial cells (collagen and smooth muscle) and elastic fibres.
It helps act as a barrier to the movement of substances in the vessel