5.1 Communication And Homeostasis Flashcards

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1
Q

Define cell signalling

A

The way in which cells communicate with each other

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2
Q

Define effector

A

A cell, tissue or organ that brings about a response

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3
Q

Define homeostasis

A

Maintaining a constant internal environment despite changes in external and internal factors

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4
Q

Define negative feedback

A

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

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5
Q

Define positive feedback

A

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

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6
Q

Define sensory receptors

A

Cells/sensory nerve endings that respond to a stimulus in the internal or external environment of an organism and can create action potentials

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7
Q

Define ectotherm

A

An organism that relies on external sources of heat to maintain body temperature

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8
Q

What does homeostasis control?

A
Body temp
Blood glucose
Blood salt
Water potential of blood
Blood pressure 
Carbon dioxide concentration
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9
Q

Examples of positive feedback

A

Activity of neurons

oxytocin and cervical dilation

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10
Q

Advantages of ectotherms

A

less food is used in respiration
more energy and nutrients for growth
need to find less food
can survive for long periods without food

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11
Q

Disadvantages of ectotherms

A

Less active in cooler temperatures

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12
Q

Define hypothalamus

A

the part of the brain that coordinates homeostatic responses

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