Anatomy Practice Exam

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What are nodes of Ranvier?

Points of convergence for nerve signals
Gaps in the myelin sheath that increase conduction speed
Connections between sensory and motor neurons
Areas where neurotransmitters are released

The correct answer is: Gaps in the myelin sheath that increase conduction speed

Nodes of Ranvier are indeed gaps in the myelin sheath surrounding nerve fibers. These nodes play a crucial role in the conduction of nerve impulses along myelinated axons. The myelin sheath acts as an insulator, allowing electrical signals to travel more rapidly. The gaps, or nodes, facilitate a process known as saltatory conduction, where the nerve impulse jumps from one node to the next. This jumping significantly increases the speed of conduction compared to unmyelinated fibers. By enhancing the efficiency of signal transmission, nodes of Ranvier contribute to the overall rapid communication within the nervous system, allowing for quicker reflexes and responses.