Examlex
Why is nitrogen necessary in the human body?
Neuron
A specialized cell transmitting nerve impulses; a nerve cell.
Smooth Muscle Fibers
Muscle tissue that is involuntary, non-striated, and found in the walls of internal organs and blood vessels.
Cardiac Muscle Fibers
Specialized muscle fibers found in the heart that enable its contraction and beating.
Involuntary Control
The regulation of bodily functions not under conscious control, such as heartbeat and digestion.
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