Cardiac Cycle, Tissue Fluid and Oxygen Dissociation Curve

AI Thread Summary
The discussion revolves around a student seeking help with AS exam questions related to the cardiac cycle, oxygen dissociation in hemoglobin, and capillary function. The pressure difference between the left ventricle and aorta is attributed to the aorta's smaller diameter, resulting in higher pressure. The temperature's effect on the oxygen dissociation curve is noted as being optimal at 37°C for oxygen uptake and release in mammals. For capillaries, the permeability of the basement membrane is highlighted as a key feature for tissue fluid formation, along with the role of proteins in reabsorption. Finally, it is confirmed that the lymphatic system manages the remaining tissue fluid not reabsorbed by capillaries.
garytse86
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Hello people I am currently having problems doing my AS exam paper. Can you please help?

The question is:

During the cardiac cycle, the pressure in the left ventricle falls to a much lower level than in the aorta. Give an explanation for this difference?

I have no idea about this because we were not taught about this.

The second question was:

How the effect of temperature on the oxygen dissociation curve of haemoglobin might be advantageous to mammals?

The third question was:

State two features of capillaries that enable tissue fluid to be formed:

I only can think of one: Basement membrane is permeable so plasma can escape from the blood.

The third question was:

It is estimated that 85% of tissue fluid is reabsorbed at the venous end of a capillary. Describe what happens to the remaining tissue fluid.

It is a three-mark question: but I put:
The rest of tissue fluid is drained into the lymphatic system throught he lymph capillaries. And some fluid bathe the cells.

I really appreciate your help. Thanks a lot.
 
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Originally posted by garytse86
The question is:

During the cardiac cycle, the pressure in the left ventricle falls to a much lower level than in the aorta. Give an explanation for this difference?
Well, what is the volume of the left ventricle and what is the diameter of the aorta? The aorta is smaller, thus the pressure will be higher.

The second question was:

How the effect of temperature on the oxygen dissociation curve of haemoglobin might be advantageous to mammals?
The dissociation must have the best value for take-up and give-off of oxygen at 37oC?

The third question was:

State two features of capillaries that enable tissue fluid to be formed:

I only can think of one: Basement membrane is permeable so plasma can escape from the blood.
Uhm, let me think. This was way back.. there is something to do with proteins.. First plasma can escape from the blood, but it has to be resorbed to the blood later. Proteins are essential in this process, that is what causes those swollen hunger-bellies.

The third question was:

It is estimated that 85% of tissue fluid is reabsorbed at the venous end of a capillary. Describe what happens to the remaining tissue fluid.
The lymphatic system takes care of it, you are right.
 
Thanks a lot for your help, it was very useful!:smile:
 

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