communication and homeostasis Flashcards

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1
Q

what is excretion?

A

the removal of metabolic waste from the body

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2
Q

what is cell signalling?

A

the way in which cells communicate with each other.

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3
Q

what is an effector?

A

a cell, tissue or organ that brings about a response

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4
Q

what is homeostasis?

A

maintaining a constant internal environment despite changes in the external and internal factors

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5
Q

what is negative feedback?

A

the mechanism that reverses a change, bringing the system back to optimum

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6
Q

what is positive feedback?

A

the mechanism that increases a change, taking the system further away from the optimum

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7
Q

what are sensory receptors?

A

respond to stimuli

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8
Q

what are the aspects maintained by homeostasis?

A
  • body temp
  • blood glucose
  • blood salt conc
  • water potential of blood
  • blood pressure
  • co2 concentration
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9
Q

what is an ectotherm?

A

relies on external sources of heat to maintain body temperature

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10
Q

what is an endotherm?

A

uses heat from metabolic reactions to maintain boy temp

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