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Chapter 9

Muscle Tissue & Muscles

QuestionAnswer
which muscle has intercerlated discs? cardiac
where is cardiac muscle found? the heart
which 2 muscles can contract w/o nervous system stimulation? cardiac and smooth muscle
___ and __ muscle is involuntary cardiac and smooth
which 2 muscles are striated? cardiac and skeletal
smooth muscle is found in: walls of hollow organs (stomach, urinary bladder, etc)
___ muscle is the only voluntary muscle skeletal
skeletal muscles attach to: bones or skin
muscle functions include: produce heat, movement of bones/fluid, maintaining posture & stablizing joints
what are the 4 characteristics of muscle tissue? excitability, contractility, extensibility and elasticity
excitability has the ability to: receive & respond to stimuli
contractility has the ability to: shorten forcibly when stimulated
extensibility has the ability to: stretch
elasticity has the ability to: recoil to resting length
skeletal muscles attach in what 2 places? insertion and origin
insertion movable bone
origin immovable bone
muscles are covered by: epimysium
fascicles are covered by: perimysium
what is a fascicle? a portion of the muscle
muscle fibers are covered by: endomysium
sarcolemma is the __ of the muscle fiber plasma membrane
sarcoplasm is the ___ of the muscle fiber cytoplasm
what 2 structures of the muscle fiber help regulate muscle contraction? T-tubules and sarcoplasmic reticulum
myofibrils are composed of : myofilaments
what is a sarcomere? a segment of a myofribil
what are the 2 types of myofilaments? actin and myosin
actin are the __ molecules found in myofilaments thin
myosin are the __ molecules found in myofilaments thick
Created by: Mariahj25