BIOL 2401: Muscular System Study
Guide Exam All Solved Correctly 2026.
What are the functions of muscle? - Answer producing movement
maintaining posture,
stabilizing joints
generating heat
What is the ability of a muscle to recoil after being stretched? - Answer elasticity
What is the ability of an electrical impulse to stimulate a muscle cell to contract? - Answer
excitability
What is the ability of muscle cells to shorten and generate a pulling force? - Answer
contractility
What is the muscles' ability to be stretched back to its original length by contraction of an
opposing muscle? - Answer extensibility
What are the three muscle types in the body? - Answer skeletal, cardiac, smooth
What is the epimysium? - Answer holds/seperates a whole muscle
A whole muscle is a group of? - Answer Fascicles
What is the perimysium? - Answer surrounds 1 fasicle
A fasicle is a group of? - Answer a group of fibers
What is the endomysium? - Answer surrounds each individual fiber
What is a fiber? - Answer a cell which is a bunch of parallel myofibrils
What is the sarcolemma? - Answer specialized plasma membrane of muscle cells
, What is sarcoplasm? - Answer a fiber's cytoplasm
What is the function of the sarcoplasmic reticulum? - Answer surrounds and contacts all the
individual myofibrils
What is the function of transverse tubules- (T-tubes)? - Answer connect the sarcolemma and
the sarcoplasmic reticulum.
What is a myofibril? - Answer complex organells inside the fibers (cells). A whole myofibril is
a chain of sarcomeres
What is a sarcomere? - Answer parallel groupings of two types of proteins called
myofilaments.
What is the contractile unit of muscle? - Answer sarcomere
What is actin? - Answer Thin filament protein. Twisted into a double helix and appears like a
double-stranded chain of pearls. Contains the myosin-binding site.
What is myosin? - Answer Thick filament protein with a head and elongated tail, the heads
form cross bridges with the thin filaments during muscle contraction
What is the sliding filament theory? - Answer theory that actin filaments slide toward each
other during muscle contraction, while the myosin filaments are still
What is the I- Band? - Answer region where there is only actin and the Z-line
What is the H- Zone? - Answer middle region where there is only myosin
Only _____ is attached to the Z- line. - Answer Actin
What is myoglobin? - Answer A protein that holds a reserve supply of oxygen in muscle cells?
In their resting state all cells have a voltage across their membrane; this is called the? - Answer
membrane potential.
When there is a change, or depolarization, that is conducted along the membrane it is called
an? - Answer action potential.
Guide Exam All Solved Correctly 2026.
What are the functions of muscle? - Answer producing movement
maintaining posture,
stabilizing joints
generating heat
What is the ability of a muscle to recoil after being stretched? - Answer elasticity
What is the ability of an electrical impulse to stimulate a muscle cell to contract? - Answer
excitability
What is the ability of muscle cells to shorten and generate a pulling force? - Answer
contractility
What is the muscles' ability to be stretched back to its original length by contraction of an
opposing muscle? - Answer extensibility
What are the three muscle types in the body? - Answer skeletal, cardiac, smooth
What is the epimysium? - Answer holds/seperates a whole muscle
A whole muscle is a group of? - Answer Fascicles
What is the perimysium? - Answer surrounds 1 fasicle
A fasicle is a group of? - Answer a group of fibers
What is the endomysium? - Answer surrounds each individual fiber
What is a fiber? - Answer a cell which is a bunch of parallel myofibrils
What is the sarcolemma? - Answer specialized plasma membrane of muscle cells
, What is sarcoplasm? - Answer a fiber's cytoplasm
What is the function of the sarcoplasmic reticulum? - Answer surrounds and contacts all the
individual myofibrils
What is the function of transverse tubules- (T-tubes)? - Answer connect the sarcolemma and
the sarcoplasmic reticulum.
What is a myofibril? - Answer complex organells inside the fibers (cells). A whole myofibril is
a chain of sarcomeres
What is a sarcomere? - Answer parallel groupings of two types of proteins called
myofilaments.
What is the contractile unit of muscle? - Answer sarcomere
What is actin? - Answer Thin filament protein. Twisted into a double helix and appears like a
double-stranded chain of pearls. Contains the myosin-binding site.
What is myosin? - Answer Thick filament protein with a head and elongated tail, the heads
form cross bridges with the thin filaments during muscle contraction
What is the sliding filament theory? - Answer theory that actin filaments slide toward each
other during muscle contraction, while the myosin filaments are still
What is the I- Band? - Answer region where there is only actin and the Z-line
What is the H- Zone? - Answer middle region where there is only myosin
Only _____ is attached to the Z- line. - Answer Actin
What is myoglobin? - Answer A protein that holds a reserve supply of oxygen in muscle cells?
In their resting state all cells have a voltage across their membrane; this is called the? - Answer
membrane potential.
When there is a change, or depolarization, that is conducted along the membrane it is called
an? - Answer action potential.
