It is seen that RBC count is more in the persons living at high altitudes. Indicate the reason behind this.

1

(a)

It is due to the low concentration of O₂ in the air, which enables less O₂ binding capacity of the haemoglobin, this increases RBC count in persons living at high altitude.

Why is blood group identification not needed or serum identification?

1

(a)

Because serum does not have the coagulation/clotting factor.

What is the effect of dengue fever on the platelets of blood in humans?

1

(a)

One of the major effect of dengue fever is the low platelet counts. It leads to life threatening condition if left untreated.

Heart failure is called congestive heart failure. Why?

1

(a)

The congestion of lungs is a symptom of heart failure. Thus, it is also called congestive heart failure.

Indicate the blood vessel that transports hormones from the hypothalamus to the anterior pituitary.

1

(a)

Hypophyseal portal vein.