Nerve cells transmit messages faster when they have:
Correct answer: D. Myelinated axons
- A. Many dendrites
- B. Many genes
- C. Non-myelinated axons
- D. Myelinated axons
Explanation
Myelinated axons are axons that are surrounded by a myelin sheath, a fatty insulating layer. The myelin sheath acts as an electrical insulator, allowing nerve impulses to "jump" between gaps in the myelin called "Nodes of Ranvier." This phenomenon, known as saltatory conduction, speeds up the transmission of nerve impulses significantly. As a result, myelinated axons can transmit messages much faster than non-myelinated axons.
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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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