anatomy nc 39&40

Skeletal Muscle Tissue

contracts under voluntary control move the body by pulling on bones

Cardiac Muscle Tissue

involuntary, found in heart when it contracts, blood is pumped through vessels

Smooth Muscle Tissue

involuntary, found in walks of hollow organs in digestive tract it moves fluids and solids as a lining in small arteries it regulates vessel diameter

Skeltal Muscle Functions and def

Produce Skeletal Movement- pull on tendons, move the bones

Support Soft Tissue- support weight of organs and shield tissues from injury

Maintain Posture and Body Position- stabilizes joints by tension in skeletal muscles to help maintain posture

Guard Entrances and Exits- sphinates encircle openings of digestive & urinary tracts

Maintain Body Temp- whenever energy is used in body some of its converted into heat, heat released by working muscles to keep body temp or normal range

Provide Nutrient Reserves- proteins in skeletal muscles are broken down into amino acids which are released

Order of Skeltal Muscle Structure

Muscle- fascicle-fiber

Epimysium

seperates muscle from surrounding tissues and organs, surrounds and protects entire skeletal muscle

Perimysium

contains blood vessels and nerves that maintain blood flow and innervate muscle fibers, groups skeltal muscle fibers into bunches

Endomysium

interconnects with muscle fibers, wraps around each skeletal muscle fiber

tendon

tough, fibrous connective tissue, connects skeltal muscle to bones, transmitting forces to produce movement

aponeurosis

broaf, flat sheet of dense fibrous connective tissue, anchors muscle to bone or other muscle

skeletal muscle

voluntary, striated muscle tissue attached to bones that drives conscious body movement, posture, body heat generation

muscle fascicle

bundle of skeletal muscle fibers wrapped tog in parallel arrangement by a protective tissue sheath; the perimysium

muscle fiber

single, long, cylindrical muscle that contracts to create movement

mysosatellite cell

adult stem cells found in skeletal muscle that is responsible for muscle regeneration, repair, growth

myoblast

embroyonic progenitor/ stem cell that diffrentates into a muscle cell

sarcolemma

specialized cell membrane, surrounds a stricted muscle fiber or cardiomyocyle

sarcoplasm

specialized cytoplasm of muscle cell/ fiber

Skeltal Muscle Functions- 6 names

Produce Skeletal Movement, Support Soft Tissue, Maintain Posture and Body Position, Guard Entrances and Exits,Maintain Body Temp, Provide Nutrient Reserves