reflex actions Flashcards

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1
Q

are reflex actions voluntary?

A

no

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2
Q

why are reflex arcs important

A

to minimise damage to the body

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3
Q

what happens when a pin is touched (reflex action)

A
  • The pin (the stimulus) is detected by a receptor in the skin
  • A sensory neurone sends electrical impulses to the spinal cord (the coordinator)
  • Impulse is passed to a relay neurone in the spinal cord
  • Relay neurone synapses with a motor neurone
  • Motor neurone carries an impulse to a muscle in the leg (the effector)
  • Muscle contracts and pulls the foot away from sharp object (the response) when stimulated by the motor neurone
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4
Q

three types of neurons in a reflex action

A

sensory, relay, motor

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5
Q

what do sensory neurones do

A

carry impulses from sense organs to the CNS (brain or spinal cord)

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6
Q

what do relay neurons do

A

connect sensory and motor neurones

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7
Q

what do motor neurons do

A

carry impulses from the CNS to effectors (muscles or glands)

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8
Q

description of sensory neurons

A

long and have a cell body branching off the middle of the axon

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9
Q

description of relay neurons

A

short and have a small cell body at one end with many dendrites branching off it

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10
Q

description of motor neurons

A

long and have a large cell body at one end with long dendrites branching off it

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11
Q

what is a synapse

A

gap between two neurons

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12
Q

can electrical impulses pass over synapses?

A

no

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13
Q

where are synapses found in a reflex acc?

A

between the sensory and relay neurons

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14
Q

what is the name of the chemical that diffuses across the synapse

A

neurotransmitters

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15
Q

what is the ordor or action when a stimulus is detected in a reflex action

A

stimulus, receptor, sensory neurone, relay neurone, motor neurone, effector

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