How many interneurons does the CNS contain approximately?
Correct answer: D. 100 billion
- A. 1 trillion
- B. 100 trillion
- C. 1 million
- D. 100 billion
Explanation
Humans have an estimated 100 billion interneurons making up about 99% of all neurons in the body.
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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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