BIOS252 COMPREHENSIVE EXAM 2026 FULL
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ sarcoplasmic reticulum.
Answer: specialized endoplasmic reticulum of muscle cells that
stores calcium
◉ z-disc.
Answer: coin-shaped sheet of proteins that anchors the thin
filaments and connects myofibrils to one another
◉ m-line.
Answer: middle of sarcomere
◉ a band.
Answer: dark area; extends length of the thick filaments (myosin)
◉ i band.
Answer: light area; thin myofilaments only (z disc is center of i band)
◉ zone of overlap.
,Answer: the densest, darkest area on a light micrograph
where thick and thin filaments overlap
◉ thick filament.
Answer: myosin
◉ thin filament.
Answer: actin
◉ contractile protein.
Answer: actin and myosin, generate the force during a muscle
contraction
◉ structural protein.
Answer: a type of protein that offers strength and shape to cells
◉ regulatory protein.
Answer: tropomyosin and troponin; act like a switch to determine
when the fiber can contract and when it cannot
◉ connective tissue of skeletal muscle.
Answer: epimysium, perimysium, endomysium
, ◉ epimysium.
Answer: connective tissue around the whole muscle
◉ perimysium.
Answer: connective tissue around the muscle fascicles
◉ endomysium.
Answer: connective tissue around the muscle fibers
◉ muscle contraction step 1.
Answer: nerve releases ACh, which attaches to sarcolemma, causes
sodium ion channels to open and creates action potential
◉ muscle contraction step 2.
Answer: action potential travels down t-tubule and causes
sarcoplasmic reticulum to release calcium
◉ muscle contraction step 3.
Answer: calcium travels to sarcomere and attaches to troponin to
move it out of the way of the binding site
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ sarcoplasmic reticulum.
Answer: specialized endoplasmic reticulum of muscle cells that
stores calcium
◉ z-disc.
Answer: coin-shaped sheet of proteins that anchors the thin
filaments and connects myofibrils to one another
◉ m-line.
Answer: middle of sarcomere
◉ a band.
Answer: dark area; extends length of the thick filaments (myosin)
◉ i band.
Answer: light area; thin myofilaments only (z disc is center of i band)
◉ zone of overlap.
,Answer: the densest, darkest area on a light micrograph
where thick and thin filaments overlap
◉ thick filament.
Answer: myosin
◉ thin filament.
Answer: actin
◉ contractile protein.
Answer: actin and myosin, generate the force during a muscle
contraction
◉ structural protein.
Answer: a type of protein that offers strength and shape to cells
◉ regulatory protein.
Answer: tropomyosin and troponin; act like a switch to determine
when the fiber can contract and when it cannot
◉ connective tissue of skeletal muscle.
Answer: epimysium, perimysium, endomysium
, ◉ epimysium.
Answer: connective tissue around the whole muscle
◉ perimysium.
Answer: connective tissue around the muscle fascicles
◉ endomysium.
Answer: connective tissue around the muscle fibers
◉ muscle contraction step 1.
Answer: nerve releases ACh, which attaches to sarcolemma, causes
sodium ion channels to open and creates action potential
◉ muscle contraction step 2.
Answer: action potential travels down t-tubule and causes
sarcoplasmic reticulum to release calcium
◉ muscle contraction step 3.
Answer: calcium travels to sarcomere and attaches to troponin to
move it out of the way of the binding site
