The nervous system: Homeostasis and response: Biology: GCSE (9:1)

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17 Terms

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Nervous system

The network of nerve cells and fibres that transmits nerve impulses between parts of the body

<p>The network of nerve cells and fibres that transmits nerve impulses between parts of the body</p>
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Neurones

Basic cells of the nervous system that carry electrical impulses around the body

<p>Basic cells of the nervous system that carry electrical impulses around the body</p>
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Electrical impulses

The impulses or signals that are carried by neurones

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Central nervous system (CNS)

The brain and the spinal cord

<p>The brain and the spinal cord</p>
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Peripheral nervous system

The parts of the nervous system outside of the brain and spinal cord such as the sensory and motor neurones

<p>The parts of the nervous system outside of the brain and spinal cord such as the sensory and motor neurones</p>
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Stimulus

A change in an organism's surroundings

<p>A change in an organism's surroundings</p>
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Receptors

Special structures that allow living organisms to sense the conditions of their internal or external environment

<p>Special structures that allow living organisms to sense the conditions of their internal or external environment</p>
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Sensory neurone

A neurone that carries impulses from the sensory organs to the central nervous system

<p>A neurone that carries impulses from the sensory organs to the central nervous system</p>
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Coordinator

The central nervous system which formulates a response to a stimulus before sending impulses to an effector

<p>The central nervous system which formulates a response to a stimulus before sending impulses to an effector</p>
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Motor neurone

A neurone that sends impulses from the CNS to an effector

<p>A neurone that sends impulses from the CNS to an effector</p>
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Effector

A structure that acts in response to a stimulus such as muscles which contract or glands which secrete hormones

<p>A structure that acts in response to a stimulus such as muscles which contract or glands which secrete hormones</p>
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Response

A reaction to a stimulus

<p>A reaction to a stimulus</p>
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Reflex arc

A shorter nerve pathway involved in a reflex action made up of a sensory neurone, relay neurone and a motor neurone

<p>A shorter nerve pathway involved in a reflex action made up of a sensory neurone, relay neurone and a motor neurone</p>
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Relay neurone

A short type of neurone that is involved in reflex actions and is found in the spinal cord

<p>A short type of neurone that is involved in reflex actions and is found in the spinal cord</p>
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Reflex response

A quick and involuntary reaction to a stimulus such as moving a hand away from a hot object

<p>A quick and involuntary reaction to a stimulus such as moving a hand away from a hot object</p>
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Synapse

A junction or gap between neurones where information in chemical form is transmitted from one neurone to the next

<p>A junction or gap between neurones where information in chemical form is transmitted from one neurone to the next</p>
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Neurotransmitter

A chemical that is released from the ends of an active neurone and diffuses across the synapse to other neurones

<p>A chemical that is released from the ends of an active neurone and diffuses across the synapse to other neurones</p>

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