A Node of Ranvier (Myelin Sheath Gap)

question 11

Multiple Choice

A node of Ranvier (myelin sheath gap)

• A) occurs only in ganglia.
• B) is one segment of the myelin sheath.
• C) occurs in the PNS but not in the CNS.
• D) is a bare region of axonal membrane in myelinated axons only.

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Definitions:

Seas Saltier

A condition resulting from the evaporation of ocean water, which increases the concentration of salts, making the seas saltier.

Quartzite

A hard, metamorphic rock formed from quartz-rich sandstone that has undergone heat and pressure transformations.

Weather

The state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.

Physical Weathering

The natural breakdown of rocks and minerals at the Earth's surface due to physical processes such as temperature changes, wind, water, and ice, without altering the rock's chemical composition.