Reflex Actions (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which three characteristics define reflex actions?
Which three characteristics define reflex actions?
Involuntary, rapid, protective
What is the correct sequence of the reflex arc?
What is the correct sequence of the reflex arc?
Stimulus→Receptor→Coordinator→Effector→Response
What is the effector in a reflex arc?
What is the effector in a reflex arc?
Structure carrying out response (muscle/gland)
How does the response vary for a specific stimulus in a reflex arc?
How does the response vary for a specific stimulus in a reflex arc?
It is always identical
What is the coordinator in the knee-jerk reflex?
What is the coordinator in the knee-jerk reflex?
The spinal cord
What makes the knee-jerk reflex unusual compared to most reflexes?
What makes the knee-jerk reflex unusual compared to most reflexes?
No relay neurone; only one synapse
Why are reflex actions rapid?
Why are reflex actions rapid?
They involve minimal synapses
What is the protective value of the knee-jerk reflex?
What is the protective value of the knee-jerk reflex?
Part of balance system; prevents falling
Which stimuli trigger the blinking reflex?
Which stimuli trigger the blinking reflex?
Cornea contact, drying, approaching objects
Which muscle lowers the upper eyelid in the blinking reflex?
Which muscle lowers the upper eyelid in the blinking reflex?
Superior levator palpebrae muscle