Question

Humans perspire when body temperature is warm and ______________.
A. Precipitation is low
B. Precipitation is high
C. Humidity is low
D. Humidity is high

Answer 1

Hint: Perspiration or sweating in humans is a normal phenomenon when sweat glands secrete watery fluids and salt. Sweat glands through small pores in the skin releases sweat. Sweating is also a way by which the body cools down itself in high heat. Two types of sweat glands are known - apocrine and eccrine. The apocrine sweat glands are found in the armpits and produce sweat with odor due to bacterial decomposition while eccrine glands are distributed all over the body.

Complete answer:
Option A: Precipitation has nothing to do with perspiration and therefore this option is not correct.
Thus, Option A is not correct.
Option B: As mentioned above, precipitation does not affect perspiration.
Thus, Option B is not correct.
Option C: During low humidity, the sweat evaporates immediately and hence we do not see perspiration.
Thus, Option C is also not correct.
Option D: During high humidity, the sweat does not evaporate easily and hence perspiration is observed. In humid weather when the body is warm sweating occurs, further due to humidity the atmospheric temperature is also low which does not allow for ready evaporation of sweat.
Thus, Option D is correct.

Hence, Option D. Humidity is high, is the correct answer.

Note:
Sweating is a process occurring in the bodies of mammals that helps in thermoregulation. Also known as perspiration, sweating is the discharge of a salty fluid through sweat glands. Changes in body temperature, the environment temperature, or mental stress can trigger sweating. Common regions of sweating include: armpits, face, arms of the hand’s soles of the feet. Sweating in ordinary quantities is a crucial physical process. Not sweating sufficient and sweating an excessive amount can be problematic. The absence of sweat may be risky due to the fact your chance of overheating increases. Excessive sweating can be greater psychologically detrimental than bodily detrimental.