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Human Biology muscle

Human biology October 18th 2007 TRCC Muscle cells

QuestionAnswer
H Zones are made of Thick filaments
A Bands are made of Thick filaments
Thick filaments are made of myosin and actin
what are the gaps in a sarcomere H zones
In a contracted sarcomere, what happens to the H zone becomes very small
Where is the z line in a sarcomere in the very center of the I band
tetanus is muscle stimulation without being able to relax
fatigue is apparent when the muscle relaxes even though stimulation is apparent
skeletal muscle cell is also known as a fiber
sarcolemma is the membrane that surrounds the sarcoplasm
sarcoplasmic reticulum muscle endoplasmic reticulum
T tubes run transversely through sarcoplasm
T Tubes are perpendicular to S and R
Myofibrils are fibers bunched together that contain thick and thin myolfilaments
myosin can be found in which myolfilament? Thick
Thin myofilaments contain actin, tropomyosin, and troponin
sarcomere is the actual contraction piece of the muscle/myofibril
Z lines seperate the sarcomeres
A bands contain Myosin and actin
What is the middle broad section of the sarcomere A Band
What band contains only thin filaments and is makes up ends of two sarcomeres? I band
What is the middle of the A band called? H zone
Innervation means muscle contraction
what stimulates an innervation nerve impulses release a neurotransmitter
sarcomplasmic reticulum relases Ca2+
Calcium ions act as mediators between excitation and contraction
Fx's of musculosckeletal system support, protection, motion, posture, heat production, RBC production, Ca and P storage resevoir
smooth muscles are unstriated and involuntary
agonist muscles are the primary movers such as flexors
antagonistic pairs are opposing muscles
synergists cut down unnecessary energy and assists antagonistic muscles
gaster of the muscle aka belly
origin of the muscle is the end of the muscle on the stationary bone
insertion of the muscle is the end of the muscle on the bone that moves
epimysium is the wrap of the muscle that houses the connective tissue and connects w/ tendons
endomysium surrounds each muscle cell and is a thin connective tissue
muscle breaks down into fascicles, cells, and then myofibrils
Created by: The_Good_Mista
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