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Kariis Allen

Physiology Wk 1

TermDefinition
Homeostasis is used to describe the relatively constant states maintained by the body—internal environment around body cells remains constant
Examples of Homeostasis 1. Temperature regulation 2. Regulation of blood carbon dioxide level 3. Regulation of blood glucose level
Models of Homeostasis 1. The body can be envisioned as a bag of fluid 3. The body is compared with a circus high-wire walker 4. The body is like a home with a thermostat 5. Each different model of homeostasis emphasizes different aspects of the overall concept
Feedback Loops 1. Communication maintaining or restoring homeostasis by self-regulation through feedback 2. Afferent communication goes toward a control center or other point of reference 3. Efferent communication goes away from a control center
Basic components of Control Mechanisms 1. Sensor mechanism 2. Integrating, or control, center 3. Effector mechanism 4. Feedback
Intracellular Control 1. Regulation within cells 2. Genes or enzymes can regulate cell processes
Intrinsic Control 1. Regulation within tissues or organs 2. May involve chemical signals 3. May involve other “built-in” mechanisms
Extrinsic Control 1. Regulation from organ to organ 2. May involve nerve signals 3. May involve endocrine signals (hormone
Positive feedback in Control Systems 1. Are stimulatory 2. Can sometimes bring specific body functions to swift completion 3. Can result from damage, which may cause negative feedback loops to operate improperly
Negative feedback in Control Systems 1. Are inhibitory; they negate changes in a variable 2. Are responsible for maintaining homeostasis 3. Are much more common than positive feedback in control systems 4. Can be described in terms of stimulus and response
Created by: Nursereesie
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