Homeostasis Flashcards

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1
Q

How is the ECF divided?

A

80% is interstitial fluid (ISF)

20% is Plasma

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2
Q

Explain how a negative feedback control works?

A
  • Change in value (e.g. temp) detected by receptors
  • Data fed to integrating centre
  • Compared to reference level
  • If different, a signal is sent to an effector
  • Change is negated
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3
Q

What is the magnitude of the error signal proportional to? (-ve feedback)

A

The magnitude of the error signal is proportional to the size of deviation

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4
Q

Example of negative feedback?

A
Core body temp rises
Fed to integrating centre
Error signal fired
capillaires vasodilate & sweat glands activate
Core Body temp returns to normal
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5
Q

What is feed forward control?

A

Similar to negative feedback but with more sensors so changes be anticipated & negated in advance
E.g. our skin detecting temp changes before they affect our core body temp

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6
Q

How much of body water is in the ICF?

A

66% of body water (28L) in intracellular fluid

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7
Q

How much water is in the ECF?

A

33% of body water (14L) in extracellular fluid.

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