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20 terms

Ch 6 Muscles Overview

Marieb
STUDY
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muscle fibers
the long, slender cells that make up muscles
striated muscle
a muscle that is connected at either or both ends to a bone and so move parts of the skeleton
voluntary muscle
a muscle that is under conscious control
perimysium
Connective tissue surrounding a fascicle
fasicle
A discrete bundle of muscle cells
endomysium
Connective tissue surrounding a muscle fiber
tendons
tissue that connects muscle to bone
aponeuroses
broad, fibrous sheets of connective tissue
smooth muscle
a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)
cardiac muscle
the muscle tissue of the heart
muscular system
enables movement of the body and internal organs
sarcolemma
an extensible membrane enclosing the contractile substance of a muscle fiber
myofibrils
Micorsopic, fiber-like structures that occupy most cytoplasm in skeletal muscle cells
light bands
only actin
dark bands
both actin and myosin
sarcomere
The smallest functional unit of muscle tissue
mysoin
AKA thick filaments, A Protein that makes up nearly half of the proteins in muscle cells
actin
AKA thin filaments, A globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other contractile elements in cells.
cross bridges
are formed when tail of myosin molecule, which consists of 2 intertwined helical polypeptide heavy chains, contract and link the thick and thin filaments together; the gobular heads, are business end of myosin;
sarcoplasmic reticulum
corresponds to endoplasmic reticulum, network of membranous channels that surround each myofibril and runs parallel to it