An automatic response that involes only one part of an organism is?

Question

a spider spinning web

b thinking

c instinct

d a reflect

e taxis

Answer 1

An automatic response that involves only one part of an organism is a reflex ( twinkle reflex as reaction on dazzled with light or knee jerk - the reflex tested by tapping just below the knee causing the lower leg to suddenly jerk forward. f.e. )

A taxis means in medicine the moving of a body part by manipulation into normal position, as after a dislocation, fracture, or hernia.

In Biology a taxis means the responsive movement of a free-moving organism or cell toward or away from an external stimulus, such as light.

http://www.answers.com/topic/taxis?cat=h...

Spinning a web is a "voluntary act", not an automatism.

Thinking is cognitive too.

Instinct is an inborn pattern of behavior that is characteristic of a species and is often a response to specific environmental stimuli: the spawning instinct in salmon; altruistic instincts in social animals

http://www.answers.com/topic/instinct?ca...