BSC2085 - Quiz 9 Word Scramble
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Name | Description |
Muscle Fibers | muscle cells - elongated |
Myofilaments | protein for muscle contraction; actin & myosin |
Muscle root words | myo/mys/sarco |
Skeletal Muscle | attach to skeleton = voluntary; stripes = striations |
Striations | stripes |
Cardiac Muscle | heart walls; striated & involuntary |
Smooth Muscle | walls of hollow visceral organs; no striations & involuntary |
Muscle Functions | produce movement, maintain posture, stabilize poorly reinforced joints, generate heat |
Excitability | Irritability |
Neurotransmitter | chemical stimulation |
Acetylcholine (ACh) | neurotransmitter for skeletal muscle |
Contractility | shorten when stimulated |
Extensibility | will stretch or extend |
Elasticity | will return to resting length after stretching |
Endomysium | surrounds each muscle fiber |
Perimysium | surrounds each fascicle bundle |
Epimysium | surrounds entire muscle organ |
Arteries deliver | O2 & nutrients |
Veins remove | metabolic waste |
Sarcolemma | plasma membrane of muscle |
Sarcoplasm | cytoplasm |
Myoglobin | red pigment protein stores O2 |
Myofibrils | contractile elements, run parallel entire length of fiber |
Sarcomere | small contracting units from Z line to Z line |
A bands | dark bands |
H zone | lighter area in middle of A band, thin and thick filaments don't overlap |
M line | dark line bisecting H zone, hold together adjacent thick filaments |
I bands | light bands |
Z line | dark midline thru I band |
Myofilaments | make up myofibril |
Myosin Protein | thick filament; tails bundled with 2 globular heads |
Actin Protein | thin filaments |
Globular actin | G actin, one actin protein |
Fibrous actin | F actin, strand of globular proteins |
Tropomyosin | 2 long, rod-shaped proteins, stiffen F actin |
Troponin | connects tropomyosin to G actin |
Sarcoplasmic Reticulum | regulates intracellular levels of Ca ions, releases Ca when needed to stimulate contractions |
Transverse T Tubules | penetrate cell's interior and pass to all myofibrils to conduct impulses |
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NknmJewel
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