Reflex Action and Reflex Arc (Grade 12 NSC Matric Life Sciences): Quizzes
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Practise the questions
10 questions from this quiz
What is a reflex action?
What is a reflex action?
A rapid, involuntary reaction to stimulus
Why are reflex actions important for the body?
Why are reflex actions important for the body?
They protect body by enabling immediate response
Which is an example of a reflex action?
Which is an example of a reflex action?
Pulling hand away from hot surface
Where are reflex actions initially processed?
Where are reflex actions initially processed?
In the spinal cord
How quickly do reflex actions occur?
How quickly do reflex actions occur?
In milliseconds
What is the correct sequence of a reflex arc pathway?
What is the correct sequence of a reflex arc pathway?
Stimulus→Receptor→Sensory→Inter→Motor→Effector
What is the function of the interneuron in a reflex arc?
What is the function of the interneuron in a reflex arc?
Acts as relay connecting sensory to motor
Through which root does the sensory neuron enter the spinal cord?
Through which root does the sensory neuron enter the spinal cord?
Dorsal root
What do receptors do in a reflex arc?
What do receptors do in a reflex arc?
Detect stimuli & convert to nerve impulses
Can you consciously control a reflex action once it has begun?
Can you consciously control a reflex action once it has begun?
No, reflexes are involuntary