Biology B1 2.2 Reflex actions.

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What are reflex actions?
Reflex actions are rapid, automatic responses to a stimulus.
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What do reflexes do?
Protect us from damage.
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What are the main steps involved in reflex actions (reflexes)?
A receptor detects a stimulus (e.g. sharp pain), a sensory neuron transmits the impulse to the CNS, a relay neuron passes the impulse on, a motor neuron is stimulated, the impulse passes to an effector (muscle or gland) and action is taken.
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What is at the junction between two neurons?
A synapse.
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How do impulses pass across the gap (synapse)?
Chemicals transmit the impulse across the gap.
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What is the sequence from receptor to effector called?
A reflex arc.
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What is the function of a relay neuron?
It links the sensory and motor neurons.
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***LEARN THE SEQUENCE OF A REFLEX ACTION***
***WHATEVER THE EXAMPLE THE SEQUENCE OF EVENTS IS THE SAME SO DONT PANIC IF THE SITUATION IS NEW TO YOU, IDENTIFY THE STIMULUS AND RESPONSE***
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Card 2

Front

What do reflexes do?

Back

Protect us from damage.

Card 3

Front

What are the main steps involved in reflex actions (reflexes)?

Back

Preview of the front of card 3

Card 4

Front

What is at the junction between two neurons?

Back

Preview of the front of card 4

Card 5

Front

How do impulses pass across the gap (synapse)?

Back

Preview of the front of card 5
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