Motor Pathways Extending from the Central Nervous System to Muscle

question 47

True/False

Motor pathways extending from the central nervous system to muscle fibers are subject to control by both excitatory or inhibitory interneurons.

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Definitions:

Countercurrent Exchange

A mechanism occurring in nature and designed systems wherein two flowing bodies of water, air, or other substances move in opposite directions of each other to maximize the transfer rate of heat or matter.

Concurrent Exchange

A process in which two substances, such as blood and air in the lungs, flow in opposite directions to maximize the transfer of gases or other molecules.

Tracheal Tubes

A network of air tubes in insects that branch throughout the body for gas exchange.

Spiracles

External respiratory openings in insects and some amphibians and fish, used for breathing.