Peter suffers damage to his left frontal lobe and loses the ability to speak, although he can still understand speech. Despite the permanence of this damage, he is able to recover some of his speech due to the ability of other parts of the brain to take over lost function. This phenomenon is known by neuroscientists as:

This phenomenon is known by neuroscientists as Neuroplasticity, or brain plasticity

Explanation:

Think of plasticity, Neuroplasticity, or brain plasticity, is the simplest terms, as the ability of parts of the brain to adapt their function or ability to change throughout life.

Structural plasticity - brains ability to change in response to the environment.

Functional plasticity-brains ability to change in response to the activities.

the endocrine system secretes hormones into blood and other body fluids. these chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. hormones provide feedback to the brain to affect neural processing. reproductive hormones affect the development of the nervous system.