A2 Biology Unit 5 Flashcards - Coordination

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What are the two main forms of coordination in mammals?
The nervous system and the hormonal system
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What does the nervous system do?
Uses nerve cells to pass electrical impulses along their length. Neurotransmitters are stimulated which are used in communication
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What does the hormonal system do?
Produce chemicals used for communication
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What are two examples of chemical mediators?
Histamine and Prostaglandins
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What are chemical mediators?
Chemicals that are released from certain mammalian cells
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What is an example of a plant growth factor?
Indoleacetic acid (IAA)
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Name the features of a neurone
Cell body, dendrons, axon, schwann cells, myelin sheath, nodes of ranvier
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What is a neurone described as at resting potential?
Polarised
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What affects the speed of a nerve impulse?
Myelin sheath, diameter of the axon, temperature and the potassium pump
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What is the refractory period?
Period where action potential is impossible as it limits the amount of action potentials and means its only in one direction
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Card 2

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What does the nervous system do?

Back

Uses nerve cells to pass electrical impulses along their length. Neurotransmitters are stimulated which are used in communication

Card 3

Front

What does the hormonal system do?

Back

Preview of the front of card 3

Card 4

Front

What are two examples of chemical mediators?

Back

Preview of the front of card 4

Card 5

Front

What are chemical mediators?

Back

Preview of the front of card 5
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