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Chamberlain University-Illinois
BIOS 252
Chamberlain BIOS 252 Exam 1 Questions
and Answers 2026 Latest Update
skeletal muscle Ans: A muscle that is attached to the bones of the skeleton
and provides the force that moves the bones.
Location of skeletal muscle Ans: in skeletal muscles attached to bones or
occasionally to skin
Excitability Ans: ability to respond to stimuli
Conductivity Ans: The ability of an object to transfer heat or electricity to
another object.
Extensibility Ans: ability to be stretched
Elasticity of muscle Ans: Ability of muscle fibers to recoil and resume their
resting length after being stretched.
Contractibility Ans: ability to shorten/contract
Sarcomere Ans: Contractile unit of muscle (z disc to z disc)
Sarcolemma Ans: muscle cell membrane
sarcoplasmic reticulum (SR) Ans: organelle of the muscle fiber that stores
calcium
Z disc Ans: coin-shaped sheet of proteins that anchors the thin filaments
and connects myofibrils to one another
M line Ans: middle of sarcomere
A band Ans: dark area; extends length of the thick filaments
I band Ans: light band, actin only
© 2026 All rights reserved
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Zone of Overlap Ans: where thick and thin filaments overlap
Thick filaments Ans: myosin
Thin filaments Ans: actin
contractile proteins in muscle Ans: actin and myosin
structural proteins Ans: proteins that form an organism's physical
attributes
regulatory proteins Ans: tropomyosin and troponin
Microfilaments Ans: Long, thin fibers that function in the movement and
support of the cell
Myofibrils Ans: Microscopic protein filaments that make up muscle cells.
muscle fiber Ans: muscle cell
muscle fassicle Ans: bundle of muscle fibers
Epimysium Ans: surrounds entire muscle
Perimysium Ans: Connective tissue surrounding a fascicle
Endomysium Ans: Connective tissue surrounding a muscle fiber
steps of neuromuscular junction Ans: 1. action potential generates release
of acetylcholine
2. action potential is generated in sarcolemma of muscle cell and travels
through T tubules
3. sarcoplasmic reticulum releases Ca2+
4. myosin cross bridges can form
steps of sliding filament theory Ans: 1) A sarcomere shortens as a result of
the z lines moving closer together
2) The z lines converge as the result of myosin heads attaching to the actin
filament and asynchronously pulling (power strokes) the actin filament
across the myosin, resulting in shortening of the muscle fiber.
© 2026 All rights reserved
Chamberlain University-Illinois
BIOS 252
Chamberlain BIOS 252 Exam 1 Questions
and Answers 2026 Latest Update
skeletal muscle Ans: A muscle that is attached to the bones of the skeleton
and provides the force that moves the bones.
Location of skeletal muscle Ans: in skeletal muscles attached to bones or
occasionally to skin
Excitability Ans: ability to respond to stimuli
Conductivity Ans: The ability of an object to transfer heat or electricity to
another object.
Extensibility Ans: ability to be stretched
Elasticity of muscle Ans: Ability of muscle fibers to recoil and resume their
resting length after being stretched.
Contractibility Ans: ability to shorten/contract
Sarcomere Ans: Contractile unit of muscle (z disc to z disc)
Sarcolemma Ans: muscle cell membrane
sarcoplasmic reticulum (SR) Ans: organelle of the muscle fiber that stores
calcium
Z disc Ans: coin-shaped sheet of proteins that anchors the thin filaments
and connects myofibrils to one another
M line Ans: middle of sarcomere
A band Ans: dark area; extends length of the thick filaments
I band Ans: light band, actin only
© 2026 All rights reserved
, 2 | Page
Zone of Overlap Ans: where thick and thin filaments overlap
Thick filaments Ans: myosin
Thin filaments Ans: actin
contractile proteins in muscle Ans: actin and myosin
structural proteins Ans: proteins that form an organism's physical
attributes
regulatory proteins Ans: tropomyosin and troponin
Microfilaments Ans: Long, thin fibers that function in the movement and
support of the cell
Myofibrils Ans: Microscopic protein filaments that make up muscle cells.
muscle fiber Ans: muscle cell
muscle fassicle Ans: bundle of muscle fibers
Epimysium Ans: surrounds entire muscle
Perimysium Ans: Connective tissue surrounding a fascicle
Endomysium Ans: Connective tissue surrounding a muscle fiber
steps of neuromuscular junction Ans: 1. action potential generates release
of acetylcholine
2. action potential is generated in sarcolemma of muscle cell and travels
through T tubules
3. sarcoplasmic reticulum releases Ca2+
4. myosin cross bridges can form
steps of sliding filament theory Ans: 1) A sarcomere shortens as a result of
the z lines moving closer together
2) The z lines converge as the result of myosin heads attaching to the actin
filament and asynchronously pulling (power strokes) the actin filament
across the myosin, resulting in shortening of the muscle fiber.
© 2026 All rights reserved
