Hardening of the arteries, also called atherosclerosis, occurs when fat, cholesterol, and other substances build up in the walls of arteries. These deposits are called plaques.efinition. Hardening of the arteries, also called atherosclerosis, occurs when fat, cholesterol, and other substances build up in the walls of arteries. These deposits are called plaques. Over time, these plaques can block the arteries and cause problems throughout the body.
CNS fatigue (CNS = central nervous system) is a slightly more convoluted phenomenon, but the term is thrown around frequently in the world of fitness. By itself, the acronym evokes notions of frailty, complication, and extreme caution.NS fatigue (CNS = central nervous system) is a slightly more convoluted phenomenon, but the term is thrown around frequently in the world of fitness. By itself, the acronym evokes notions of frailty, complication, and extreme caution.
1 Central nervous system (CNS): a part of the nervous system which includes the brain and spinal cord. 2  Parasympathetic nervous system: the part of your nervous system that unconsciously controls your organs and glands when your body is at rest.how/hide words to know. 1  Central nervous system (CNS): a part of the nervous system which includes the brain and spinal cord. 2  Parasympathetic nervous system: the part of your nervous system that unconsciously controls your organs and glands when your body is at rest.