Contractions
Contractions
Contractions (/kənˈtrækʃənz/) are a physiological process that occurs in various systems of the body, most notably in the muscular and digestive systems. The term is derived from the Latin contractio, meaning "a drawing together".
Muscular Contractions
In the muscular system, contractions refer to the shortening or tightening of a muscle. This can occur in response to a stimulus, such as nerve impulse or hormonal signal. There are three types of muscle contractions: isotonic, isometric, and eccentric.
Isotonic Contraction
An isotonic contraction occurs when a muscle shortens while maintaining a constant tension. This is the type of contraction that occurs during most physical activities, such as lifting a weight or running.
Isometric Contraction
An isometric contraction occurs when a muscle maintains the same length while increasing its tension. This type of contraction is often used to maintain posture or stabilize a joint.
Eccentric Contraction
An eccentric contraction occurs when a muscle lengthens while maintaining a constant tension. This type of contraction is often used to slow down a movement or lower a weight.
Digestive Contractions
In the digestive system, contractions refer to the rhythmic tightening and relaxing of the muscles in the walls of the digestive tract. These contractions, also known as peristalsis, help to move food and waste through the system.
Related Terms
External links
- Medical encyclopedia article on Contractions
- Wikipedia's article - Contractions
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