Chamberlain University BIOS 252 Exam 1
Study Guide 2025/2026 | Anatomy &
Physiology II Practice Questions with
Detailed Answers
skeletal muscle - ANSWER-A muscle that is attached to the bones of the skeleton
and provides the force that moves the bones.
Location of skeletal muscle - ANSWER-in skeletal muscles attached to bones or
occasionally to skin
Excitability - ANSWER-ability to respond to stimuli
Conductivity - ANSWER-The ability of an object to transfer heat or electricity to
another object.
Extensibility - ANSWER-ability to be stretched
Elasticity of muscle - ANSWER-Ability of muscle fibers to recoil and resume their
resting length after being stretched.
Contractibility - ANSWER-ability to shorten/contract
,Sarcomere - ANSWER-Contractile unit of muscle (z disc to z disc)
Sarcolemma - ANSWER-muscle cell membrane
sarcoplasmic reticulum (SR) - ANSWER-organelle of the muscle fiber 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
I band - ANSWER-light band, actin only
Zone of Overlap - ANSWER-where thick and thin filaments overlap
Thick filaments - ANSWER-myosin
Thin filaments - ANSWER-actin
contractile proteins in muscle - ANSWER-actin and myosin
, structural proteins - ANSWER-proteins that form an organism's physical attributes
regulatory proteins - ANSWER-tropomyosin and troponin
Microfilaments - ANSWER-Long, thin fibers that function in the movement and
support of the cell
Myofibrils - ANSWER-Microscopic protein filaments that make up muscle cells.
muscle fiber - ANSWER-muscle cell
muscle fassicle - ANSWER-bundle of muscle fibers
Epimysium - ANSWER-surrounds entire muscle
Perimysium - ANSWER-Connective tissue surrounding a fascicle
Endomysium - ANSWER-Connective tissue surrounding a muscle fiber
steps of neuromuscular junction - ANSWER-1. action potential generates release
of acetylcholine
2. action potential is generated in sarcolemma of muscle cell and travels through T
tubules
Study Guide 2025/2026 | Anatomy &
Physiology II Practice Questions with
Detailed Answers
skeletal muscle - ANSWER-A muscle that is attached to the bones of the skeleton
and provides the force that moves the bones.
Location of skeletal muscle - ANSWER-in skeletal muscles attached to bones or
occasionally to skin
Excitability - ANSWER-ability to respond to stimuli
Conductivity - ANSWER-The ability of an object to transfer heat or electricity to
another object.
Extensibility - ANSWER-ability to be stretched
Elasticity of muscle - ANSWER-Ability of muscle fibers to recoil and resume their
resting length after being stretched.
Contractibility - ANSWER-ability to shorten/contract
,Sarcomere - ANSWER-Contractile unit of muscle (z disc to z disc)
Sarcolemma - ANSWER-muscle cell membrane
sarcoplasmic reticulum (SR) - ANSWER-organelle of the muscle fiber 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
I band - ANSWER-light band, actin only
Zone of Overlap - ANSWER-where thick and thin filaments overlap
Thick filaments - ANSWER-myosin
Thin filaments - ANSWER-actin
contractile proteins in muscle - ANSWER-actin and myosin
, structural proteins - ANSWER-proteins that form an organism's physical attributes
regulatory proteins - ANSWER-tropomyosin and troponin
Microfilaments - ANSWER-Long, thin fibers that function in the movement and
support of the cell
Myofibrils - ANSWER-Microscopic protein filaments that make up muscle cells.
muscle fiber - ANSWER-muscle cell
muscle fassicle - ANSWER-bundle of muscle fibers
Epimysium - ANSWER-surrounds entire muscle
Perimysium - ANSWER-Connective tissue surrounding a fascicle
Endomysium - ANSWER-Connective tissue surrounding a muscle fiber
steps of neuromuscular junction - ANSWER-1. action potential generates release
of acetylcholine
2. action potential is generated in sarcolemma of muscle cell and travels through T
tubules
