Gce Model Questions Vol1 2018 Biology Question 8

Practice essay / theory question 8 from the 2018 Gce Model Questions Vol1 Biology examination. This question covers Coordination, Reflex arc, Neuromuscular junction, Neurotransmission .

Gce Model Questions Vol1 2018 Biology Essay / Theory

Topics: Coordination Reflex arc Neuromuscular junction Neurotransmission

Question 8 GCE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

During a laboratory experiment a student taps the tip of a frog’s toe and records that the hind leg flexes rapidly and then returns to its original position.

Question Parts

( a )

Describe the neural pathway involved in this withdrawal reflex, naming the receptor, afferent neuron, interneuron (if present), effector muscle and the type of synapse.

( b )

Compare this reflex with a voluntary movement such as lifting a glass of water. Discuss differences in speed, cortical involvement and purpose.

( c )

A toxin that blocks acetylcholine receptors at the neuromuscular junction is introduced. Predict how this would affect the reflex described and explain the underlying physiological basis.

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About This Question

This is Gce Model Questions Vol1 2018 Biology Question 8. It is one of the essay questions from the 2018 Gce Model Questions Vol1 Biology examination.

The question covers Coordination, Reflex arc, Neuromuscular junction, Neurotransmission .

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