Question

a) Explain why people on reaching high altitude may suffer from unsteady vision, loss of hearing, lack of muscular coordination and even complete blackout.

b) Give the characteristics of hormones pertaining to:
i) site of action
ii) Chemical nature
iii) manner of transport [5 MARKS]

Answer 1

a) 2 Marks
b) 3 Marks

a) Amount of oxygen decreases with altitude, therefore its supply to the nervous system is decreased leading to unsteady vision, loss of hearing, lack of muscular coordination and even complete blackout.

b) i) hormones usually act on target organs or cells usually away from their source.
ii) Hormones are proteins, amino acids or steroids in nature.
iii) Hormones are transported through blood.