Question

When the environmental temperature is hot and humid, it causes

• A. contraction of both dartos and cremaster muscles
• B. relaxation of both dartos and cremaster muscles
• C. contraction of dartos and relaxation of cremaster muscles
• D. relaxation of dartos and contraction of cremaster muscles

Answer 1

The correct option is B relaxation of both dartos and cremaster muscles

The dartos muscles and cremaster muscles contract or relax in response to variations in temperature.
In response to low temperature, they both contract and in response to high temperature, they both relax.

Contraction of cremaster muscles raises the testes closer to the body which enables them to absorb heat from the body.

The contraction of dartos muscles tightens the scrotum thus reducing the heat loss from the scrotum. Exposure to warmth or hot temperatures reverses these conditions.