Question

You duck your head when a baseball is thrown at your face. You are responding to:

• A. An internal stimulus
• B. An external stimulus
• C. A hormonal change
• D. An internal threat

Answer 1

The correct option is B

An external stimulus

An external stimulus is a change in the surroundings that causes the body to respond. In this case, you duck your head because the ball is thrown at your face. The ball acts as a source of external stimulus and ducking of face is the response for it.