Homeostasis Flashcards

1
Q

Explain the importance of physiological control systems

A

If disruption is too severe or homeostasis is crucial to survival, death will result
BALANCE

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2
Q

Explain the meaning of homeostasis

A

Physiological control systems maintain a relatively stable internal environment (i.e., within safe limits or a “normal range”) in a fluctuating environment

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3
Q

Example of negative feedback

A

blood pressure

Thermoregulation

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4
Q

Example of positive Feedback

A

Blood clotting

Oxytocin

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5
Q

Example of feedforward control

A

Digestive system

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6
Q

What percentage of fluid is ECF and ICF

A

70%ICF

30%ECF

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7
Q

Nervous response to homeostasis

A

quick, short duration response

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8
Q

endocrine response to homeostasis

A

long, longer duration response

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9
Q

Open Loop:

A

controller - controller component - output
THIS OUTPUT NOT INFLUENCED BY RESULTING CONDITIONS
Can result in run away reactions if there is no termination

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10
Q

Closed Loop:

A

Controller - controller component - output - sensor - feedback - controller
INFLUENCED BY RESULTING CONDITIONS

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11
Q

negative feedback

A

returns to set point

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12
Q

feedforward

A

response is generated in anticipation of change

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13
Q

positive feedback

A

moves away from set point

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14
Q

negative feedback control of arterial BP

A

baroreceptors (stretch receptors in carotid arteries and aortic arch) are SENSOR
nucleus in medulla oblongata references set point and notices change in bp CONTROL CENTRE
EFFECTORS
CONTROLLED = rise or fall in BP
SENSOR

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15
Q

Gain

A

degree of effectiveness of a negative feedback control system
= Correction/error

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