Mention the causes of high blood pressure.

2

(a)

Which coronary artery disease is caused due to narrowing of the lumen of arteries?

2

(a)

Give the reason for reduced blood flow to the heart muscles leading to their death.

2

(a)

What are two heart sounds? When and how are these sounds produced?

2

(a)

Explain heart sounds.

2

(a)

What is meant by P-Q interval and S-T interval in electrocardiography?

2

(a)

A fish's heart pumps only deoxygenated blood Why?

2

(a)

If a patient's ECG reveals an abnormally long delay between the P-wave and the QRS deflection, what does this suggest?

2

(a)

What is the role of WBCs?

2

(a)

What happens in haemophilia?

2

(a)

Explain thrombocytes.

2

(a)

What is the role of pulmonary vein and how is it different from other veins?

2

(a)

Define a portal vein? Explain the functions of such a vein in our digestive system.

2

(a)

Explain why the blood of earthworm is less efficient oxygen carrier than that of man?

2

(a)

Why is swelling of feet or leg caused when a person stands immobile for a long time?

2

(a)