Which type of spasm is a reflexive reaction against injury?

Answer 1

What occurs when you try to protect yourself from immediate injury is a phenomenon called the Central Nervous System Reflex Arc. For example, if you inadvertently touch a hot stove, an involuntary Concentric contraction occurs, which shortens your muscles (your Biceps being one of the major groups in this instance). This involuntary action helps to prevent you from being burned, so that you can quickly withdraw your hand. It works like this: Sensory info from the hot stove is processed by the nerves in your spinal cord without the involvement of your brain. Although your brain also receives the painful stimulus, the benefits of this involuntary Central Nervous System Reflex Arc protects you from immediate harm.