Test: MCAT Biology

1.

Other than acting as a barrier for the body from the environment, the integumentary system is also responsible for thermoregulation. Which of the following occurs when body temperature drops below a certain threshold?

Mechanoreceptors in the skin are primed for easier activation of action potentials

Erector muscles contract and causes hair to stand up

The skin opens vital pores, which allow more water exchange

The skin secretes sodium, and water passively follows through the process of osmosis

Erector muscles contract and causes hair to lay flat against the skin

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