Reflex Action (Leaving Cert Biology): Flashcards
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What is a reflex action?
What is a reflex action?
Automatic, involuntary, unthinking response to a stimulus
Examples of reflex actions
Examples of reflex actions
Knee jerk, sneezing
Three components of most reflex arcs
Three components of most reflex arcs
Sensory neuron, interneuron, motor neuron
Common reflex action example
Common reflex action example
Pulling hand away from hot object
Why are reflex arcs important?
Why are reflex arcs important?
Allow fast responses to protect body from damage
Step 1: What stimulates receptors in hot object reflex?
Step 1: What stimulates receptors in hot object reflex?
Hot object
In reflex arc, what carries impulse to spinal cord?
In reflex arc, what carries impulse to spinal cord?
Sensory neuron
Role of interneuron in reflex arc
Role of interneuron in reflex arc
Carries impulse across spinal cord to motor neuron
In reflex arc, where does motor neuron carry impulse?
In reflex arc, where does motor neuron carry impulse?
Effector
When does person become aware in reflex action?
When does person become aware in reflex action?
When impulse reaches brain (as hand withdraws)
What does effector do in hot object reflex?
What does effector do in hot object reflex?
Hand pulls back from heat source