Four events in the transmission of nerve impulses across synapses are: I. depolarisation of the presynaptic membrane II. propagation of postsynaptic action potential III. reabsorption of the transmitter substance IV. release of transmitter substance into the synaptic cleft In which sequence do these events occur? FIRST -> LAST
Correct answer: B. I, IV, II and III
- A. I, III, II, and IV
- B. I, IV, II and III
- C. IV, I, III and II
- D. IV, III, I and II
- E. II, I, IV and III
Explanation
The sequence of transmission of nerve impulse is as follows:1.Depolarisation occurs at the presynaptic terminal.2.This leads to the release of the transmitter substance to the cleft.3.This leads to the depolarization at the postsynaptic membrane.4.Then the transmitter substance is reabsorbed back to the presynaptic membrane.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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