BSC 2085 EXAM 3 Question and Answer
2026 A+ Verified 100% Correct Questions
and Answers
• Voluntary Muscle tissue? -✓✓Skeletal.
• Involuntary muscle tissue? -✓✓Cardiac and smooth.
• Multinucleated Muscle tissue? -✓✓Skeletal muscle.
• Striated muscle tissue? -✓✓Skeletal and cardiac.
• Which type of muscle tissue has one (or two) nuclei? -✓✓Smooth muscle and
cardiac muscle.
• Do muscle cells tend to be short or long? -✓✓Long.
• Which muscle tissue has intercalated discs? -✓✓Cardiac muscle.
• What are the four special properties of muscles? -✓✓Excitability, contractility,
extensibility, and elasticity.
• What is excitability or irritability? -✓✓Muscle's ability to receive and respond to
stimuli.
• What is contractility? -✓✓Muscle's ability to shorten forcibly when stimulated.
• What is extensibility? -✓✓Ability of a muscle to stretch without damage.
• What is elasticity? -✓✓Muscle's ability to recoil to its resting length after
stretching.
• What are the major functions of muscle tissue? -✓✓Movement, maintenance of
posture, movement of body structures, stabilizing joints, and generating heat.
,• What are the three connective tissue layers that surround skeletal muscle? -
✓✓Epimysium, perimysium, and endomysium.
• What does the epimysium surround? -✓✓Entire skeletal muscle.
• What does the perimysium surround? -✓✓Surrounds a fascicle.
• What is a muscle fascicle? -✓✓Bundle of muscle fibers that run parallel to each
other in a skeletal muscle.
• What does the endomysium surround? -✓✓Individual muscle fiber.
• What is the structural and functional unit of the skeletal muscle? -✓✓Sarcomere.
• What are the major regions of the sarcomere? -✓✓H zone, A band, Z disc (line),
and I band.
• What is the H zone? -✓✓Region where there are only actin fibers present; it
disappears when the muscle contracts.
• What is the A band? -✓✓Region with both myosin and actin filaments; appears
darker than the I band.
• What is the purpose of the Z disk (line)? -✓✓Border of the sarcomere that
separates neighboring sarcomeres.
• What is the I band? -✓✓Contains only actin filaments and is lighter than A
bands.
• What is the sarcolemma? -✓✓Plasma membrane of the sarcomere containing
Na+ and K+ gates.
• What is the sarcoplasmic reticulum? -✓✓Organelle that stores Ca+ ions until
released into the sarcoplasm.
• What is the myofibril? -✓✓Thread-like structure that is a contractile organelle of
a skeletal muscle fiber.
, • What are T (transverse) tubules? -✓✓Extensions of the sarcolemma that run next
to the terminal cisternae of the sarcoplasmic reticulum.
• What is the sarcoplasm? -✓✓Cytoplasm of muscle cell that receives Ca+ ions
from the sarcoplasmic reticulum.
• What is the triad? -✓✓T tubule along with two terminal cisterns of the
sarcoplasmic reticulum.
• What is myoglobin? -✓✓Oxygen-binding molecule found in muscle.
• What are glycosomes? -✓✓Organelles within skeletal muscle containing
glycogen.
• What is the sliding filament model of contraction? -✓✓Thin filaments slide past
thick filaments.
• What is the thin filament made of? -✓✓Actin.
• What is the thick filament made of? -✓✓Myosin.
• Which filaments appear thicker and darker? -✓✓Myosin.
• Which filaments appear thinner and lighter? -✓✓Actin.
• What is the neuromuscular junction? -✓✓Axon terminal associated with a
skeletal muscle.
• What nerves go to the skeletal muscle? -✓✓Somatic motor fibers.
• What part of the skeletal muscle has acetylcholine (ACh) receptors? -✓✓Motor
end plate.
• What happens at the neuromuscular junction for a skeletal muscle to contract? -
✓✓ACh is released into synaptic cleft and binds to ACh receptors.
2026 A+ Verified 100% Correct Questions
and Answers
• Voluntary Muscle tissue? -✓✓Skeletal.
• Involuntary muscle tissue? -✓✓Cardiac and smooth.
• Multinucleated Muscle tissue? -✓✓Skeletal muscle.
• Striated muscle tissue? -✓✓Skeletal and cardiac.
• Which type of muscle tissue has one (or two) nuclei? -✓✓Smooth muscle and
cardiac muscle.
• Do muscle cells tend to be short or long? -✓✓Long.
• Which muscle tissue has intercalated discs? -✓✓Cardiac muscle.
• What are the four special properties of muscles? -✓✓Excitability, contractility,
extensibility, and elasticity.
• What is excitability or irritability? -✓✓Muscle's ability to receive and respond to
stimuli.
• What is contractility? -✓✓Muscle's ability to shorten forcibly when stimulated.
• What is extensibility? -✓✓Ability of a muscle to stretch without damage.
• What is elasticity? -✓✓Muscle's ability to recoil to its resting length after
stretching.
• What are the major functions of muscle tissue? -✓✓Movement, maintenance of
posture, movement of body structures, stabilizing joints, and generating heat.
,• What are the three connective tissue layers that surround skeletal muscle? -
✓✓Epimysium, perimysium, and endomysium.
• What does the epimysium surround? -✓✓Entire skeletal muscle.
• What does the perimysium surround? -✓✓Surrounds a fascicle.
• What is a muscle fascicle? -✓✓Bundle of muscle fibers that run parallel to each
other in a skeletal muscle.
• What does the endomysium surround? -✓✓Individual muscle fiber.
• What is the structural and functional unit of the skeletal muscle? -✓✓Sarcomere.
• What are the major regions of the sarcomere? -✓✓H zone, A band, Z disc (line),
and I band.
• What is the H zone? -✓✓Region where there are only actin fibers present; it
disappears when the muscle contracts.
• What is the A band? -✓✓Region with both myosin and actin filaments; appears
darker than the I band.
• What is the purpose of the Z disk (line)? -✓✓Border of the sarcomere that
separates neighboring sarcomeres.
• What is the I band? -✓✓Contains only actin filaments and is lighter than A
bands.
• What is the sarcolemma? -✓✓Plasma membrane of the sarcomere containing
Na+ and K+ gates.
• What is the sarcoplasmic reticulum? -✓✓Organelle that stores Ca+ ions until
released into the sarcoplasm.
• What is the myofibril? -✓✓Thread-like structure that is a contractile organelle of
a skeletal muscle fiber.
, • What are T (transverse) tubules? -✓✓Extensions of the sarcolemma that run next
to the terminal cisternae of the sarcoplasmic reticulum.
• What is the sarcoplasm? -✓✓Cytoplasm of muscle cell that receives Ca+ ions
from the sarcoplasmic reticulum.
• What is the triad? -✓✓T tubule along with two terminal cisterns of the
sarcoplasmic reticulum.
• What is myoglobin? -✓✓Oxygen-binding molecule found in muscle.
• What are glycosomes? -✓✓Organelles within skeletal muscle containing
glycogen.
• What is the sliding filament model of contraction? -✓✓Thin filaments slide past
thick filaments.
• What is the thin filament made of? -✓✓Actin.
• What is the thick filament made of? -✓✓Myosin.
• Which filaments appear thicker and darker? -✓✓Myosin.
• Which filaments appear thinner and lighter? -✓✓Actin.
• What is the neuromuscular junction? -✓✓Axon terminal associated with a
skeletal muscle.
• What nerves go to the skeletal muscle? -✓✓Somatic motor fibers.
• What part of the skeletal muscle has acetylcholine (ACh) receptors? -✓✓Motor
end plate.
• What happens at the neuromuscular junction for a skeletal muscle to contract? -
✓✓ACh is released into synaptic cleft and binds to ACh receptors.
