MEDIUM
AS and A Level
IMPORTANT
Earn 100
Suggest why there are no blood capillaries in the cornea of the eye. How the cornea is supplied with oxygen and nutrients?
Important Questions on Transport in Mammals
HARD
AS and A Level
IMPORTANT
Suggest reason that why normal venous pressure in the feet is about 25 mm Hg. When a soldier stands motionless at attention, the blood pressure in his feet rises very quickly to about 90 mm Hg.
HARD
AS and A Level
IMPORTANT
Suggest reason-When you breathe in that is when the volume of the thorax increases the blood moves through the veins towards the heart.
HARD
AS and A Level
IMPORTANT
Using the given graph. Explain how blood pressure varies in different parts of the circulatory system?
HARD
AS and A Level
IMPORTANT
Construct a table comparing the structure of arteries, veins and capillaries. Include both similarities and differences. And give reasons for the differences you describe.
HARD
AS and A Level
IMPORTANT
The given table shows the relative permeability of the capillary walls in a muscle to different substances.
Use the given information and your knowledge to discuss whether there is a relationship between the RMM of a substance and the permeability of the capillary walls to that substance. If so, how can you explain this relationship.?
HARD
AS and A Level
IMPORTANT
The most abundant plasma protein is albumin. Why it is important that the capillary walls are not permeable to this protein?
HARD
AS and A Level
IMPORTANT
The disease Kwashiorkor is caused by diet which is very low in protein. The concentration of proteins in blood plasma is much lower than usual. One of the symptoms of Kwashiorkor is the swelling caused by build-up of tissue fluid. Suggest why this is so?
HARD
AS and A Level
IMPORTANT
Assuming that you have 2.5 1013 red blood cells in your body, that the average life of a red blood cell is 120 days, and that the total number of red blood cells remains constant, calculate how many new red blood cells must be made, on average, in your bone marrow each day.
