Question

Which of the following assists in the return of venous blood to the heart? OA) valves B) skeletal muscle contractions C) respiratory movements D) reduction in cross-sectional area from venules to veins E) All of these are correct.

Answer 1

All of the factors helps in return of venous blood to the heart.

Skeletal muscle contrcation increases the return.

Respiratory activity also increases this.

Valve control this return.

Cross sectional area decrease will reduce the peripheral resistance.

15) complement system is the protein molecules assisted system which makes pore in the cell wall of bacteria and kill the bacteria .

Adaptive is broad spectrum term it is the axis which is mediated after antigen sense.

Antibody may help in this process but it perform many other functions..

18)Hemoglobin is composed of hemoglobin , iron and four polypeptide chains.

24)option B is correct , atrioventricular includes both bicuspid and tricuspid which is responsible for lub.

Then, semilunar valve closes and is responsible for dup.

28)options D is correct , because first part is mouth then esophagus then stomach then duodenum and then jejunum and then colon and finally rect.

30)B is incorrect because RBC is not associated with blood clot it's Function is carry respiratory gases (oxygen and carbon dioxide).

And other cells and associated Functions are correct.

Thank you