Single circulation is characteristic of

1.	Fish heart
2.	Frog heart
3.	Crocodilian heart
4.	Marsupial heart

Consider the following diagrams depicting a cardiac cycle:

The correct sequence in which these vents occur would be:

1. 2, 3, 1 
2. 1, 2, 3
3. 2, 1, 3 
4. 3, 1, 2

Which is the correct pathway of pulmonary circulation?

1. Rt. ventricle $\underset{\mathrm{bolld}}{\overset{\mathrm{Deoxygenated}}{\to }}$ Lungs $\underset{\mathrm{blood}}{\overset{\mathrm{Oxygenated}}{\to }}$ Lt. atrium

2. Rt. ventricle $\underset{\mathrm{blood}}{\overset{\mathrm{Oxygenated}}{\to }}$Lungs $\underset{\mathrm{bolld}}{\overset{\mathrm{Deoxygenated}}{\to }}$ Lt. atrium

3. Lt ventricle $\underset{\mathrm{bolld}}{\overset{\mathrm{Deoxygenated}}{\to }}$ Lungs $\underset{\mathrm{blood}}{\overset{\mathrm{Oxygenated}}{\to }}$ Rt. atrium

4. Lt ventricle body$\underset{\mathrm{blood}}{\overset{\mathrm{Oxygenated}}{\to }}$ Body tissues $\underset{\mathrm{bolld}}{\overset{\mathrm{Deoxygenated}}{\to }}$ Rt ventricle

Three chamber heart of frog is not as efficient as four chambered human heart because :-

Which of the following type of cells lack a nucleus?

Agranulocytes responsible for the immune response of the body are:

The second heart sound (dubb) is associated with the closure of

1. tricuspid valve

2. semilunar valve

3. bicuspid valve

4. tricuspid and bicuspid valve

Which of the following correctly explains a phase/event in cardiac cycle in a standard electrocardiogram?

Which of the following is most numerous leucocytes, they have fine granules and are phagocytic in nature?

The haemoglobin content per 100 ml of blood of a normal healthy human adult is: