(a) Name the red pigment which carries oxygen in the blood
(b) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds ?
(c) How many chambers are there in the heart of : (i) an amphibian, (ii) a mammals, and (ii) a fish ?
(d) Describe the circulatory system in a fish.

Name the red pigment which carries oxygen in blood

Name the red pigment which carries oxygen in blood.

Name the red pigment in blood which carries oxygen in the human body ?

(a) Explain how the separation of oxygenated and deoxygenated blood is useful in humans ? (b) Why is double circulation of blood necessary in humans ?

NH_(3) is excretory waste in which of the following :- ( A )Bird (B) Amphibians (C) Mammals (D) Fishes

Explain the following : (a) Why does the atrial systole normally precedes the ventricular systole ? (b) Why is S-A node called the pacemaker of the heart ? (c ) Why does the ventricle relax as a closed chamber in the early phase of its diastole ? (d) Why is there no mixing of deoxygenated and oxgenated blood in mammalian heart ? (e ) Why can you palpate the pulse on an artery in each heart beat ? (f) Why does the lymph contain much less proteins than the plasma ? (g) Why does the ventricle contract as a closed chamber in the early phase of its systole ? (h) Why is the closed circulatory system more efficient than the open one ? (i) Why does the left ventricle has a thicker wall than the right ventricle ?