Heart And Haemoglobin

Question 1

Why are elastic fibres important in the aorta?

Answer 1

They stretch - high pressure/when ventricle contracts.
They recoil - low pressure/when ventricle relaxes.
Smooth blood flow

Question 2

Importance of muscle fibres in wall of arteriole

Answer 2

Muscle contracts.

Causing arteriole to constrict to regulate the blood flow to the capillaries.

Question 3

Benefit of slower blood flow

Answer 3

Longer to exchange substances

Question 4

Things to remember for oxygen dissociation curves

Answer 4

Haemoglobin’s affinity for oxygen.
Partial pressure - and saturation at this pressure.
Whether or not the oxygen loads or unloads.

Question 5

Formation of tissue fluid

Answer 5

High blood/high hydrostatic pressure/pressure filtration. 
Forces water/fluid out. 
Large proteins remain in capillary. 
Low water potential in capillary/blood. 
Due to (plasma) proteins. 
Water enters capillary/blood. 
(By) osmosis. 
Reference to a lymph.

Question 6

Which chamber in the heart has the thickest walls and why?

Answer 6

Left ventricle- needs to pump blood to extremities of the body but right ventricle only needs to pump blood to the heart.