Biology - Nervous System - B1.2.1

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What does the nervous system do?
It enables us to react to our surroundings and coordinate our behaviour
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What are receptors?
Cells that detect stimuli
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What are stimuli?
Changes in the environment
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Name two receptor located on the head that detect waves
In the eye- light. In the ears - sound
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Where is the receptor that enables us to keep our balance?
In the ears - changes in position
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What are the stimuli that receptors in the skin can detect?
Touch, pressure, pain and temperature
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What are receptors on the tongue and in the nose sensitive to?
Chemicals that enable us to taste and smell
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Light receptor cells have...
... a nucleus, cytoplasm and a cell membrane
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What happens when a receptor detects a change?
Information from receptors passes along neurones in nerves to the brain. The brain coordinates a response.
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Describe a reflex action in two words.
Automatic and rapid
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Which neurones do they involve?
Sensory, relay and motor neurones
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What happens first in a simple reflex action?
1. impulses from a receptor pass along a sensory neurone to the central nervous system
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What happens first in the central nervous system during a reflex action?
2. At a junction (synapse) between a sensory neurone and a relay neurone in the CNS, a chemical is released that causes an impulse to be sent along a relay neurone
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What happens second in the CNS during a reflex action?
A chemical is then released at the synapse between a relay neurone and motor neurone in the CNS, causing impulses to be sent along a motor neurone to the organ (effector) that brings about the response
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What is an effector and how does it work?
It's either a muscle or gland, a muscle responds by contracting and a gland responds by secreting chemical substances.
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Other cards in this set

Card 2

Front

What are receptors?

Back

Cells that detect stimuli

Card 3

Front

What are stimuli?

Back

Preview of the front of card 3

Card 4

Front

Name two receptor located on the head that detect waves

Back

Preview of the front of card 4

Card 5

Front

Where is the receptor that enables us to keep our balance?

Back

Preview of the front of card 5
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