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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

A white fibrous cord of dense regular connective tissue that attaches muscle to bone.

Tendon