A motor unit is

A. a motor neuron and the muscle fibers it innervates.
B. many myofibrils in a sarcolemma.
C. the functional unit of a muscle fiber.
D. many motor end plates at a neuromuscular junction.


Answer: A

Anatomy & Physiology

You might also like to view...

Parasympathetic and sympathetic stimulation both increase salivary secretion, contrary to the usual antagonistic activity of these two components of the autonomic nervous system

Indicate whether the statement is true or false

Anatomy & Physiology

The basal nuclei

A) initiate conscious motor activity. B) activate spinal reflexes. C) adjust and refine learned motor activities. D) exert direct control over lower motor neurons. E) act as gatekeepers, filtering out unnecessary sensory input.

Anatomy & Physiology

An autoimmune disease that destroys acetylcholine receptors on skeletal muscles is

A. fibromyalgia. B. osteoarthritis. C. muscular dystrophy. D. myasthenia gravis.

Anatomy & Physiology

Renin hydrolyzes angiotensinogen, which is released from the ________, to form angiotensin I

A) spleen B) liver C) lungs D) kidneys E) heart

Anatomy & Physiology