They are axons that lead to the skeletal muscle. Each nerve fiber branches out to a number of muscle fibers. Each muscle fiber is supplied by only one motor neuron.
Envelopes and isolates NMJ
During shortening, dystrophin and linking proteins also pull on ____________ proteins. Transfers pull to ____________ tissue.
One nerve fiber ____________ the muscle fiber at several points within the NMJ.
When target cell is a muscle fiber. A chemical synapse formed by the contact between a motor neuron and a muscle fiber.
(electrical potential) a difference in electrical charge from one point to another
Fine degree of control. Three to six muscle fibers per neuron. Eye and hand muscles.
a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane. Nerve impulse causes synaptic vesicles to undergo _________ ACh into synaptic cleft
Down
Dispersed throughtout muscle. Contract in unison. Produce weak contraction over wide area. Provide ability to sustain long term conctraction as motor units take turns contraction. Effective contraction usually requires contraction of several motor units at once.
Nerve cells whose cell bodies are in the brainstem and spinal cord that serve skeletal muscles.
Thin layer of collagen and glycoprotein separating Schwann cell and muscle cell from surrounding tissues. Contains acetylcholinesterase (AChE) that breaks down ACh, allowing for relaxation.
More strength than control. Powerful contractions supplied by large motor units with hundreds of fibers. Gastrocnemius of calf has 1,000 muscle fibers per neuron.
The study of the electrical activity of cells
Swollen end of nerve fiber. Contains synaptic vesicles with acetylcholine(ACh)
Each terminal branch of the _____________ within the NMJ forms separate synapse with the muscle fiber.
Point where a nerve fiber meets its target cell
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