Homeostasis - ANS * Presence of stable internal environment
* Failure to maintain homeostasis leads to illness or death
Homeostatic Regulation - ANS Physiological adjustment to preserve homeostasis in variable environments
Feedback - ANS Stimulation of a receptor triggers response that...
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EXAM REVIEW QUESTIONS
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WITH CORRECT ANSWERS
ALL VERIFIED BY AN EXPERT
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A+ GRADED (LATEST UPDATE)
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, Homeostasis - ANS * Presence of stable internal environment
* Failure to maintain homeostasis leads to illness or death
Homeostatic Regulation - ANS Physiological adjustment to preserve homeostasis in variable
environments
Feedback - ANS Stimulation of a receptor triggers response that changes environment at that
receptor
Negative Feedback - ANS * Effector opposes or negates the original stimulus
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* Minimizes change
* Primary mechanism of homeostatic regulation in the body
* Dynamic process: Set point varies with varying environments & activity levels
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Negative Feedback Receptors - ANS Temperature receptors in skin & brain are stimulated &
send signals to the control center
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Negative Feedback Control Center - ANS The temperature control center received information
from the two sets of temperature receptors & sends commands to the effectors
Negative Feedback Effectors - ANS Sweat glands & smooth muscle in the walls of blood
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vessels supplying the skin respond
Positive Feedback - ANS * Stimulus produces a response that exaggerates or enhances the
original change (rather than opposing it)
* Tends to produce extreme responses
* Does not restore homeostasis
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Positive Feedback Loop - ANS * Escalating cycle
* Typically occurs when a potentially dangerous or stressful process must be completed quickly
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before the body can restore homeostasis
Steps of Positive Feedback in Blood Clotting - ANS 1. Damage to cells in the blood vessel wall
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releases chemicals that begin the process of blood clotting
2. The chemicals start chain reactions in which cells, cell fragments, & soluble proteins in the
blood begin to form a clot
3. As clotting continues, each step releases chemicals that further accelerate the process
4. This escalating process is a positive feedback loop that ends with the formation of a blood
clot, which patches the vessel wall & stops the bleeding
Functions of Epithelial Tissue - ANS * Provide physical protection
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