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Anatomy and Physiology-Muscle Tissue
Skeletal muscle tissue
Striated, mostly voluntary (respiratory is involuntary), multinucleate (more than one nucleus) so lots of DNA to code for protein synthesis, tendon attaches muscle to bone
cardiac muscle tissue
Involuntary, straited and branched muscles, circulates, in heart
smooth muscle tissue
no striations and involuntary, found in walls of hollow visceral organs such as the stomach urinary bladder and respiratory packages, forces food and other substances through internal body channels
Functions of muscular tissue
functions of this tissue; body movement, stabilizing body positions, storing/moving substances within the body, producing heat
Properties of muscular tissue
properties that enable muscle to function and contribute to homeostasis. Excitability, Contractility, Extensibility, Elasticity.
separates skin form muscles, provides a pathway in blood vessels and nerves to enter and exit muscles, and protects muscles from physical trauma.
lines the body wall and limbs that surround and support muscles, allows free movement of muscles, carries nerves and blood vessels, and fills space between muscles.
Rope-like Fibrous connective tissue bands that connect skeletal muscles to bones
Wide and flat sheet-like tendon joining one muscle w/another or w/bone.
somatic motor neurons
provide nerve impulses that stimulate skeletal muscle to contract.
bring in O2 and nutrients and rmove heat and waste products of muscle metabolism
Each muscle fiber has ___ or more nuclei b/c it arises from the fusion of many ____
muscle fiber's plasma membrane
small, cylindrical invaginations of the sarcolemma of striated muscle fibers that conduct muscle action potentials toward the center of the muscle fiber.
Each muscle fibers contain hundreds of ____
contractile elements of skeletal muscle
ability to respond to stimuli by producing electrical signals-action potential
travels down plasma membrane and can stimulate contraction
generates force and pulls on attached points
ability to be stretched
the tendency of a body to return to its original shape and length after it has been stretched or compressed
alternating light and dark bands
dense irregular connective tissue, lines body walls and limbs, binds muscles that perform related functions, carries blood and lymph vessels, nerves
OUTER COVERING OF A MUSCLE
surrounds 10-100 muscle fibers and separates them into bundles called fascicles
penetrates interior of each fascicles separates individual muscle fibers from one another.
endoplasmic reticulum of a cell
myoglobin (reddish protein)
sarcoplasm binds___ and releases it to ___
enlarged sacs of SR
Sarcoplasmic reticulum has expanded portions that store...
thick and thin filaments
Myofibril contain 2 smaller structures called....
darker middle part of the sarcomere, contains thick filaments
lighter, less dense contains thin filaments
have head and tail regions
covers myosin binding sites on the actin molecules
holds tropomyosin strands in place
high energy compound built up when muscles rest
slow oxidative fibers are the (size)....
SOF are very ___ resistant
SOF has ___ generation of ATP
SOF have red or white fibers
red-high myoglobin content
SOF- slow or fast contractions?
Fast oxidative fibers are ___ resistant
FOF- ___ generation of ATP
FOF- slow or fast contractions?
Fast glycolytic fibers are the ___ fibers
FGF ___ easily
FGF white or red fibers?
FGF have high levels of ___
FGF- ___ generation of ATP
FGF___, ___ contractions