Muscle Physiology Flashcards
Percentage of muscle in the human body.
50%
Percentage of skeletal muscle of a human body.
40%
Percentage of smooth and cardiac muscles that human has?
10%
what are the functions of muscles?
Produce movement
Maintain posture
Stabilize joints
Generate heat
Characteristics of the skeletal muscles.
-Long, Cylindrical
-Multinucleated
-Peripherally located
nuclei
-Striated appearance
-Voluntary
A Properties that has an ability to receive and respond to a stimulus?
Excitability
A Properties that has an ability to shorten forcibly when adequately stimulated?
Contractibility
A Properties that has an ability to be stretched or extended?
Extensibility
A Properties that has an ability of a muscle fiber to resume its resting length?
Elasticity
A cell membrane of the muscle fiber.
Sarcolemma
composed of ACTIN and MYOSIN filaments.
Myofibrils
Basic repeating and functional unit of the muscle
Sacromere
Light Band on either side of Z-line; Actin only.
I- Band
Dark band between I-Bands; Mostly Myosin.
A-Band
Light area in the middle of the sacromere, Myosin only.
H- Zone
Dark line in the middle of the sacromere, Myosin only.
M-line
Bisects the I-band, where ACTIN and MYOSIN attach upon contraction.
Z-dics
intercellular fluid that fills the spaces between myofibrils.
Sarcoplasm
Specialized endoplasmic reticulum of skeletal muscles.
Sarcoplasmic Reticulum
stretching adds new sarcomeres,
disappears if remained shortened
Length Adjustment
muscle total mass decrease
Atrophy
