The Nervous System Definitions Flashcards

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1
Q

CNS

A

Brain and spinal cord

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2
Q

What is the peripheral nervous system?

A

The nerves and ganglia outside of the CNS

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3
Q

What is the somatic nervous system?

A

Associated with skeletal muscle to provide voluntary control of body movements (part of PNS)

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4
Q

what is the autonomic nervous system?

A

Provides unconscious control of functions of internal organs, e.g. heartbeat, digestion (part of PNS)

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5
Q

what is the reflex arc?

A

An inborn response to a stimulus and is rapid, automatic and beneficial

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6
Q

what is resting potential?

A

the potential difference across the membrane when no nervous impulse is being conducted

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7
Q

What is an excitable cell?

A

A cell which can change its resting potential

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8
Q

What is the all or nothing law?

A

Law stating that “An action potential is either initiated or it is not, and it is always the same size”

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9
Q

what is saltatory conduction?

A

Jumping of action potentials from one Node of Ranvier to the next due to the electrical insulation of myelin

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10
Q

what is a nerve net?

A

The most simple type of nervous system found in simple organisms such as hydras, jellyfish and sea anemones.

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11
Q

What is a synapse?

A

Tiny gap between neurones. An impulse can be transmitted across electrically or chemically

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12
Q

What is an Excitatory drug?

A

A substance which increases the likelihood of depolarisation at a post-synaptic membrane

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13
Q

What is an inhibitory drug?

A

A substance which decreases the likelihood of depolarisation at a post-synaptic membrane

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