Physiology

Question 1

Why is blood considered to be a separate chamber?

Answer 1

chamber of its own, circulatory sytem

Question 2

In which aspect is the blood volume especially important?

Answer 2

control of cardiovascular dynamics.

Question 3

What is the average blood volume of an adult?

Answer 3

7 % of body weight, about 5 liters ,

Question 4

what % of blood is plasma?

Answer 4

60%

Question 5

Are the percentages of RBCs and plasma constant ?On what factors does it depend?

Answer 5

No,on gender,weight and other factors

Question 6

The fraction of blood composed if RBCs is called?

Answer 6

Hematocrit( Packed RBC volume)

Question 7

How is Hematocrit determined?

Answer 7

centrifuging in Hematocrit tube

Question 8

What percentage of plasma remains entrapped between RBCS after centrifugation?

Answer 8

3 to 4 %

Question 9

What are the Hematocrit values for male,female,anemic and polycythemic people?

Answer 9

male 0.40, female 0.36 , anemic 0.10,polycythemic can rise to 0.65

Question 10

What happens in polycythemia?

Answer 10

excessive production of RBCS.

Question 11

What is the major function of RBCs?

Answer 11

transport of Hb

Question 12

Is there a possibility for Hb to circulate as a free protein normally?

Answer 12

Yes, in some animals

Question 13

What are the other functions of RBCs?

Answer 13

carrying of carbonic anhydrase

Question 14

Which reaction does carbonic anhydrase catalyse?

Answer 14

reaction of water and CO2

Question 15

What makes blood transport enormous amount of CO2?

Answer 15

rapidity of carbonic acid formation

Question 16

Which component of blood is an excellent acid-base buffer?

Answer 16

Hb

Question 17

which components of blood are most responsible for buffering power of blood?

Answer 17

RBCs

Question 18

What is the shape of RBC?

Answer 18

Biconcave disk

Question 19

What is diameter and thickness of RBC?

Answer 19

diameter 7.8 micrometers, thickness 2.5 micrometers at thickest point 1 micrometer at center

Question 20

What is volume of RBC?

Answer 20

90 to 95 cubic micrometers

Question 21

Can the RBC be deformed?

Answer 21

Its is basically like a ‘bag’ its is deformed when it squeezes through the capillaries.

Question 22

What do you think of the RBC cell membrane?

Answer 22

RBC has a great excess of cell membrane for quantity of material inside it. Deformation does not stretch it greatly so the cell doesn’t rupture unlike most of the other cells.

Question 23

What is the concentration of RBCs in blood?

Answer 23

male 5200000 per cubic ml (+-300000), female 4700000 per cubic ml (+-300000).

Question 24

People living at high altitude have —– no. of RBCs than normal.

Answer 24

greater