BSC 2085 EXAM 3 Question and Answer
2026 A+ Verified 100% Correct Questions
and Answers
• 3 classification of muscle tissue -✓✓skeletal, cardiac, smooth
• skeletal muscle -✓✓surrounds the skeleton; helps with movement and stability;
voluntary
• cardiac muscle -✓✓walls of the heart; contracts in a rhythmic way to pump
blood; involuntary
• smooth muscle -✓✓walls of blood vessels and hollow organs; contracts walls and
controls blood flow; peristaltic contractions (digestion and waste elimination) and
moves contents of organs in one direction; involuntary
• common properties of muscle tissues -✓✓electrical excitability (allows muscles
to respond to stimuli); contractibility (ability to shorten in response to action
potential), extensibility (ability to stretch without injury); elasticity (ability to
restore shape after contraction or extension)
• Order components of skeletal muscle -✓✓skeletal muscle, fascicles, muscle
fibers, myofibrils, myofilaments
• 3 levels of connective tissue and their locations -✓✓endomysium (surrounds each
individual muscle fiber); perimysium (groups muscle fibers into fascicles);
epimysium (surrounds entirety of muscle; muscle belly and tendon)
• sarcolemma -✓✓plasma membrane of muscle fiber
• transverse tubules -✓✓conduct electrical stimuli from sarcolemma
• sarcoplasmic reticulum -✓✓smooth ER of the skeletal muscles; contains large
stores of calcium
, • terminal cisternae -✓✓receives action potential transmitted by transverse tubules
and triggers release of calcium from sarcoplasmic reticulum for myofibril
contraction
• nuclei -✓✓multiple and flattened nuclei
• sarcoplasm -✓✓cytoplasm of cell; densely packed with glycogen and myoglobin
• myofibrils -✓✓myofilaments arranged into contractile elements of the cell
• actin and myosin -✓✓contractile/force generation proteins of sarcomere that
produce movement
• actin -✓✓contractile protein that produces thin filament; bound by myosin with
initiate contraction
• myosin -✓✓contractile protein that produces thick filament; interacts with actin
to produce movement
• neuromuscular junction (nmj) -✓✓site where neuron (sending the electrical
impulse) meets the muscle
-signal is translated into a neurotransmitters (chemical form): acetylcholine in
skeletal muscle
-after action potential is propagated, extracellular calcium is released into
sarcoplasm
• twitch contraction -✓✓fast, brief contraction of the muscle following an external
stimulus
-latent period: time between stimulation of muscle fiber and muscle contraction
-contraction period: period of crossbridge formation as actin and myosin bind
together; influx of intracellular calcium
-relaxation: after reaching peak tension following removal of stimulation,
restoration of calcium to the sarcoplasmic reticulum
• twitch tone -✓✓the small amount of tension maintained by the skeletal muscle,
even at rest
2026 A+ Verified 100% Correct Questions
and Answers
• 3 classification of muscle tissue -✓✓skeletal, cardiac, smooth
• skeletal muscle -✓✓surrounds the skeleton; helps with movement and stability;
voluntary
• cardiac muscle -✓✓walls of the heart; contracts in a rhythmic way to pump
blood; involuntary
• smooth muscle -✓✓walls of blood vessels and hollow organs; contracts walls and
controls blood flow; peristaltic contractions (digestion and waste elimination) and
moves contents of organs in one direction; involuntary
• common properties of muscle tissues -✓✓electrical excitability (allows muscles
to respond to stimuli); contractibility (ability to shorten in response to action
potential), extensibility (ability to stretch without injury); elasticity (ability to
restore shape after contraction or extension)
• Order components of skeletal muscle -✓✓skeletal muscle, fascicles, muscle
fibers, myofibrils, myofilaments
• 3 levels of connective tissue and their locations -✓✓endomysium (surrounds each
individual muscle fiber); perimysium (groups muscle fibers into fascicles);
epimysium (surrounds entirety of muscle; muscle belly and tendon)
• sarcolemma -✓✓plasma membrane of muscle fiber
• transverse tubules -✓✓conduct electrical stimuli from sarcolemma
• sarcoplasmic reticulum -✓✓smooth ER of the skeletal muscles; contains large
stores of calcium
, • terminal cisternae -✓✓receives action potential transmitted by transverse tubules
and triggers release of calcium from sarcoplasmic reticulum for myofibril
contraction
• nuclei -✓✓multiple and flattened nuclei
• sarcoplasm -✓✓cytoplasm of cell; densely packed with glycogen and myoglobin
• myofibrils -✓✓myofilaments arranged into contractile elements of the cell
• actin and myosin -✓✓contractile/force generation proteins of sarcomere that
produce movement
• actin -✓✓contractile protein that produces thin filament; bound by myosin with
initiate contraction
• myosin -✓✓contractile protein that produces thick filament; interacts with actin
to produce movement
• neuromuscular junction (nmj) -✓✓site where neuron (sending the electrical
impulse) meets the muscle
-signal is translated into a neurotransmitters (chemical form): acetylcholine in
skeletal muscle
-after action potential is propagated, extracellular calcium is released into
sarcoplasm
• twitch contraction -✓✓fast, brief contraction of the muscle following an external
stimulus
-latent period: time between stimulation of muscle fiber and muscle contraction
-contraction period: period of crossbridge formation as actin and myosin bind
together; influx of intracellular calcium
-relaxation: after reaching peak tension following removal of stimulation,
restoration of calcium to the sarcoplasmic reticulum
• twitch tone -✓✓the small amount of tension maintained by the skeletal muscle,
even at rest
