Flashcards in Muscle Vocabulary Deck (16)
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1
A neurotransmitter liberated by many peripheral nervous system neurons and some central nervous system neurons. It is excitatory at neuromuscular junctions but inhibitory at some other synapse.
Acetylcholine
2
A contractile protein that is part of thin filaments in muscle fibers.
Actin
3
The ability of cells or parts of cells to actively generate force to undergo shortening for movements. Muscle fibers (cells) exhibit a high degree of it.
Contractility
4
The ability of tissue to return to its original shape after contraction or extension.
Elasticity
5
The ability of muscle tissue to stretch when it is pulled.
Extensibility
6
Region of the sarcolemma of a muscle fiber (cell) that includes acetylcholine (ACh) receptors, which bind ACh released by synaptic end bulbs of somatic motor neurons.
Motor end plate
7
A moto neuron together with the muscle fibers (cells) it stimulates.
Motor unit
8
A sustained, partial contraction of portions of a skeletal or smooth muscle in response to activation of stretch receptors or a baseline level of action potentials in the innervating motor neurons.
Muscle tone
9
The oxygen-binding, iron-containing protein present in the sarcoplasm of muscle fibers (cells); contributes the red color to muscle.
Myoglobin
10
The contractile protein that makes up the thick filaments of muscle fibers.
Myosin
11
The cell membrane of a muscle fiber (cells), especially of a skeletal muscle fiber.
Sarcolemma
12
A contractile unit in a striated muscle fiber (cell) extending from on Z disc to the next Z disc.
Sarcomeres
13
The cytoplasm of a muscle fiber (cells)
Sarcoplasm
14
A network of saccule and tubes surrounding myofibrils of a muscle fiber (cell), comparable to endoplasmic reticulum; functions to reabsorb calcium ions during relaxation and to release them to cause contraction.
Sarcoplasmic reticulum
15
Invagination of the epimysium that divides muscle into bundles.
Perimysium
16
