Reflex
The term for responding to a stimulus is called a reaction or a response.
A response.
The term for the length of time it takes for you to respond to a stimulus is called reaction time. It is the time from when a stimulus is presented to when a response is initiated.
The term you are looking for is "reaction" or "response." It describes the action taken as a result of a stimulus or influence.
I think is reaction.
Reaction time
The term is "reaction time." It is the time it takes for your body to process a stimulus and generate a response. A shorter reaction time is often associated with quicker reflexes and coordination.
A reflex is an automatic or involuntary response to a stimulus, typically involving a sensory nerve and a motor nerve. It is a rapid and predictable reaction that helps protect the body from harm. Examples include the knee-jerk reflex and the pupillary reflex.
A response is the reaction to the change in a person or something's change in their surroundings. This is the scientific term for the behavior.
Neutral stimulus
The word closest in meaning to "tensed the body flinched" is "tensed." This term conveys a state of muscular contraction or readiness, often in response to a stimulus. "Flinched" suggests a quick involuntary reaction to fear or surprise, reinforcing the idea of tension in the body.
Yes, it is possible to jerk backwards, which typically refers to a sudden, involuntary movement in a backward direction. This can occur due to reflexive actions, loss of balance, or external forces. The term can also be used figuratively to describe a sudden realization or reaction to something surprising.