During the transmission of nerve impulses through a nerve fibre,the potential on the inner side of the plasma membrane has which type of electric charge?
Correct answer: D. First negative then positive and again back to negative
- A. First positive then negative and continues to be negative
- B. First negative then positive and continues to be positive
- C. First positive then negative and again back to positive
- D. First negative then positive and again back to negative
Explanation
A nerve is a strand of tissue comprising many nerve fibres plus supporting tissue enclosed in a connective tissue sheath. The nerve impulse is the signal that travels along the length of a nerve fibre. This is how information is transmitted through the nervous system. It is marked by the flow of ions across the membrane of the axon caused by changes in the permeability of the membrane, producing a reduction in the potential difference that can be detected as the action potential. The strength of the impulse produced in any nerve fibre is constant.
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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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