ABOUT MUSCULAR Flashcards
RANDOM QUESTIONS
stimulates skeletal muscle
to contract.
Somatic Motor Neuron
structural and functional unit of a skeletal
muscle.
Muscle Fiber
the plasma membrane of a muscle cell
Sarcolemma
tiny invaginations of the sarcolemma, tunnel in from the surface toward the center of each muscle fiber.
Transverse (T) tubules
the cytoplasm of a muscle fiber.
Sarcoplasm
large molecule composed of many glucose molecule
Glycogen
red-colored protein; found only in muscle
Myoglobin
appears like little threads inside the
sarcoplasm
myofibrils
A fluid-filled system of membranous sacs which encircles the entire myofibrils.
Sarcoplasmic Reticulum
dilated end sacs of the sarcoplasmic reticulum butt against the T tubule
Terminal Cisterns
– is the scientific study of muscles
MYOLOGY
small protein structures within the myofibrils
Myofilaments or filaments
are the basic functional units of a myofibril
Sarcomeres
COMPONENTS OF SACROMERES
Z discs
A band
I band
H zone
M line
the darker middle part of the sarcomere which extends the entire length of the thick filaments.
A band
Is a lighter, less dense area that contains the rest of the thin filaments but no thick filaments
I band
narrow, plate-shaped regions of dense protein material separate one sarcomere from the next.
Z discs
located in the center of each A band contains thick but not thin filaments.
H zone
so named because it is at the middle of the sarcomere; at the center of the H zone.
M line