Muscle Tissue
Multinucleated
Peripherally located nuclei
Has striations (“stripes”)
skeletal
Centrally located nucleus
No striations!
smooth
•Make up sarcomeres
myofilaments
•A muscle cell
•Made of many myofibrils
muscle fiber
•Connects skeletal muscle to bone
tendon
Voluntary control
Functions:
Movement
Maintaining posture
Production of heat
(when you use energy
for it to contract)
Skeletal
Muscle’s ability to respond to stimuli (ex.
motor neurons, electricity)
excitability
thin myofilament
actin
•Connective tissue sheath that surrounds each muscle fiber
endomysium
•The organ (ex. Biceps brachii)
•Made up of fascicles
muscle
Centrally located
nucleus
Has striations
(“stripes”)
Highly branched and
interconnected
cardiac
Muscle’s ability to shorten
contractability
thick myofilament
myosin
•Plasma membrane around each muscle fiber
sacrolema
•Connective tissue sheath that surrounds the entire muscle
epimyisum
Mostly involuntary
control (some people
can mentally slow their
heart rates, though!)
Function:
Pump blood through
arteries and veins
cardiac
Muscle’s ability to be stretched without
tearing
extendability
muscles are made of many
fasicles
•Long proteins that make up each muscle fiber
myofibril
A bundle of muscle fibers
fascile
Found inside many organs!
Examples: stomach, intestines, blood
vessels, bladder, eye, reproductive organs
smooth
Muscle’s ability to return to its original
shape
myofibrils are made of many
sacromeres
•Line up to form myofibrils
Where contraction happens
sarcomere
•Connective tissue sheath that surrounds each fascicle
perimysium