reflex arcs Flashcards

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1
Q

the nerve pathway shown in the diagram may be regarded as a simple reflex arc. Use the diagram to explain why (1)

A

only 3 neurones

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2
Q

suggest 2 advantages of simple reflexes (2)

A

don’t have to be learned
can escape from predators
protect against damage to body tissues

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3
Q

central nervous system

A

consists of brain and spinal cord

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4
Q

peripheral nervous system

A

made up of pairs of nerves which originate from the brain or spinal cord

made up of sensory and motor neurones-

sensory neurones- carry impulses from receptor to central nervous system

motor nueorones- carry impulse away from central nervous system and to effector

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5
Q

voluntary nervous system

A

voluntary/conscious actions
impulses transmitted to body muscles

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6
Q

autonomic nervous system

A

involuntary/subconscious actions
impulses transmitted to body glands, smooth muscle and cardiac muscle.

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7
Q

what is a reflex?

A

involuntary response to a sensory stimulus

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8
Q

what is a reflex arc?

A

the sequence of nerve cells involved in reflex- is reflex arc

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9
Q

sequence

A

stimulus- detectable change in environment e.g. hot plate.

receptor- cells which detect change e.g. temperature sensitive cells on the back of your hand
sensory neurone carries impulse from receptor to spinal cord/coordination centre
coordinator- links motor and sensory neurones in the spinal cord
motor neurones- tranmits impulse from coordination to effector

effector- muscle in upper arm, which contracts

response- hand moves away from hot object.

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10
Q

benefits of reflex arc

A

increased speed of transmissions
this is due to few synapses

protects body tissues from damage
doesn’t have to be learnt.

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