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Tortora Chapter 1.4

Homeostasis

QuestionAnswer
What is Homeostasis? The condition in which to body's internal environment remains relatively constant within physiological limits.
What is Intracellular Fluid? ICF Fluid located within cells.
What is Extracellular Fluid? ECF Fluid outside body cells, such as interstitial fluid and plasma.
What is Interstitial Fluid? The portion of extracellular fluid that fills the microscopic spaces between the cells of tissues; the internal environment of the body. Also called intercellular or tissue fluid.
What is ECF called within the blood vessels? Blood plasma.
What is ECF called within the lymphatic vessels? Lymph.
What is ECF called in and around the brain and spinal cord? Cerebrospinal fluid.
What is ECF called in joints? Synovial fluid.
What is ECF of the eyes called? Aqueous humor and vitreous body.
What is a feedback system or feedback loop? A cycle of events in which the status of a body condition is monitored, evaluated, changed, remonitored, reevaluated, and so on.
What are the three basic components of a feedback system? A receptor, a control centre, and an effector.
What is a receptor? A body structure that monitors changes in a controlled condition and sends input to a control center. Typically the input is in the form of nerve impulses or chemical signals.
What is a control centre? For example, the brain, sets the range of values within which a controlled condition should be maintained, evaluates the input it receives from receptors, and generates output commands when they are needed. Output can be nerve impulses or hormones.
What is an effector? it is a body structure that receives output from the control centre and produces a response or effect that changes the controlled condition. Nearly every organ or tissue in the body can behave as an effector
What is a negative feedback system? It reverses a change in a controlled condition.
What is a positive feedback system? Continually reinforces a change in a controlled condition, some event outside the system must shut it off.
Created by: melijono2
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