Question

what is a reflex?
multiple choice
a stereotyped, involuntary response to a stimulus
a series of nerve signals resulting in voluntary skeletal muscle contraction
a sensation of pain or pressure
a rapid mechanism for maintaining a constant body temperature
a reaction to an external stimulus that threatens homeostasis

Explanation:

A reflex is an involuntary and stereotyped response to a stimulus. It does not involve voluntary muscle contractions (which rules out the option about voluntary skeletal - muscle contraction), is not just a sensation of pain or pressure, is not specifically about maintaining body temperature, and is not only related to threats to homeostasis. It's a basic, automatic response to a stimulus.

Answer:

A. A stereotyped, involuntary response to a stimulus