Exchange and the Lymphatic System

Question 1

Continuous capillaries, containing no clefts or pores are found in the

Answer 1

Brain

Question 2

Continuous capillaries containing clefts only and no pores are found in the

Answer 2

Muscle

Question 3

Fenestrated capillaries containing clefts and pores are found in the

Answer 3

Intestine (kidney as well)

Question 4

Discontinuous capillaries containing clefts and massive pores are found in the

Answer 4

Liver

Question 5

Diffusion of oxygen from capillaries to ECF to cell is:

Answer 5

• Self-regulating
• Non-saturable
• Non-polar substances across the membrane
• Polar substances through clefts/channels

Question 6

Hydrostatic pressure going away from the capillaries is greatest at the ______ while oncotic pressure going towards the capillaries is greatest at the ______

Answer 6

Arterioles (hydrostatic)

Venules (Oncotic)

Question 7

Explain the significance of the blood brain barrier.

Answer 7

• Blood brain barrier is composed of continuous capillary endothelium with no clefts or channels, which help it act as a barrier.
• It is an important mechanism for protecting the brain from fluctuation in plasma composition,

Question 8

What is oedema?

Answer 8

Accumulation of excess fluid

Question 9

State the 4 causes of oedema.

Answer 9

• Hypoproteinemia
• Increased capillary permeability
• Lymphatic obstruction
• Raised CVP