BIO 151 MODULE 5 2026 LEARNING MODULE
ASSESSMENT QUESTIONS AND ANSWERS
100% CORRECT
◉ What is depolarization in muscle tissue? Answer: The change of
the plasma membrane's electrical state from polarized to
depolarized, sending an action potential.
◉ What property of muscle tissue allows it to return to its original
length when relaxed? Answer: Elasticity.
◉ What does extensibility refer to in muscle tissue? Answer: The
ability of muscle tissue to stretch.
◉ What is contractility in muscle tissue? Answer: The ability of
muscle tissue to pull on its attachment points and shorten with force
when stimulated.
◉ Define excitability in muscle tissue. Answer: The ability of muscle
tissue to respond to a stimulus from a motor neuron or a hormone
and contract.
,◉ What are striations in muscle tissue? Answer: Patterns created by
the regular arrangement of actin and myosin proteins in skeletal and
cardiac muscle.
◉ What is a muscle fiber? Answer: An individual skeletal muscle cell
that is long and cylindrical.
◉ How are skeletal muscles controlled? Answer: Skeletal muscles
are under voluntary control.
◉ What is the function of skeletal muscles during contraction?
Answer: To produce movement and maintain body posture.
◉ What is unique about cardiac muscle tissue? Answer: It is found
only in the heart and is involuntary.
◉ What are intercalated discs? Answer: Structures that connect
cardiac muscle fibers, allowing them to contract as a single unit.
◉ What allows cardiac muscle tissue to not fatigue? Answer: It has a
high density of mitochondria and myoglobin for ATP production.
◉ What is the appearance of smooth muscle tissue? Answer: Non-
striated and spindle-shaped with a uniform cytoplasm.
,◉ How is smooth muscle contraction initiated? Answer: From
neurotransmitters, local chemicals, mechanical stretching, and
hormones.
◉ What is the role of smooth muscle in the circulatory system?
Answer: It regulates blood pressure and moves materials through
the body.
◉ What is the primary function of cardiac muscle tissue? Answer: To
continuously pump blood throughout the body.
◉ How does skeletal muscle produce heat? Answer: By contracting
during physical exertion.
◉ What is the significance of muscle fatigue? Answer: Skeletal
muscles can become fatigued after contraction and need time to
recover.
◉ What type of control do smooth muscles have? Answer:
Involuntary control.
◉ What is the shape of smooth muscle cells? Answer: Spindle-
shaped with one nucleus.
, ◉ What is the main difference in the organization of actin and
myosin between muscle types? Answer: Skeletal and cardiac muscle
have regular arrangements (striations), while smooth muscle does
not.
◉ Syncytium Answer: Intercalated discs allow muscle fibers to be
physically and electrically connected to each other so that the entire
heart contracts as one unit.
◉ What is the primary function of skeletal muscle? Answer: To
contract and cause movement by pulling on bones.
◉ How do skeletal muscles help maintain posture? Answer: By
making small, constant adjustments to hold the body upright or
balanced.
◉ What role do skeletal muscles play in joint stability? Answer: They
prevent excess movement of bones and joints, maintaining stability
and preventing misalignment.
◉ What are sphincters in skeletal muscles? Answer: Muscles located
at the openings of internal tracts that allow voluntary control over
bodily functions.
ASSESSMENT QUESTIONS AND ANSWERS
100% CORRECT
◉ What is depolarization in muscle tissue? Answer: The change of
the plasma membrane's electrical state from polarized to
depolarized, sending an action potential.
◉ What property of muscle tissue allows it to return to its original
length when relaxed? Answer: Elasticity.
◉ What does extensibility refer to in muscle tissue? Answer: The
ability of muscle tissue to stretch.
◉ What is contractility in muscle tissue? Answer: The ability of
muscle tissue to pull on its attachment points and shorten with force
when stimulated.
◉ Define excitability in muscle tissue. Answer: The ability of muscle
tissue to respond to a stimulus from a motor neuron or a hormone
and contract.
,◉ What are striations in muscle tissue? Answer: Patterns created by
the regular arrangement of actin and myosin proteins in skeletal and
cardiac muscle.
◉ What is a muscle fiber? Answer: An individual skeletal muscle cell
that is long and cylindrical.
◉ How are skeletal muscles controlled? Answer: Skeletal muscles
are under voluntary control.
◉ What is the function of skeletal muscles during contraction?
Answer: To produce movement and maintain body posture.
◉ What is unique about cardiac muscle tissue? Answer: It is found
only in the heart and is involuntary.
◉ What are intercalated discs? Answer: Structures that connect
cardiac muscle fibers, allowing them to contract as a single unit.
◉ What allows cardiac muscle tissue to not fatigue? Answer: It has a
high density of mitochondria and myoglobin for ATP production.
◉ What is the appearance of smooth muscle tissue? Answer: Non-
striated and spindle-shaped with a uniform cytoplasm.
,◉ How is smooth muscle contraction initiated? Answer: From
neurotransmitters, local chemicals, mechanical stretching, and
hormones.
◉ What is the role of smooth muscle in the circulatory system?
Answer: It regulates blood pressure and moves materials through
the body.
◉ What is the primary function of cardiac muscle tissue? Answer: To
continuously pump blood throughout the body.
◉ How does skeletal muscle produce heat? Answer: By contracting
during physical exertion.
◉ What is the significance of muscle fatigue? Answer: Skeletal
muscles can become fatigued after contraction and need time to
recover.
◉ What type of control do smooth muscles have? Answer:
Involuntary control.
◉ What is the shape of smooth muscle cells? Answer: Spindle-
shaped with one nucleus.
, ◉ What is the main difference in the organization of actin and
myosin between muscle types? Answer: Skeletal and cardiac muscle
have regular arrangements (striations), while smooth muscle does
not.
◉ Syncytium Answer: Intercalated discs allow muscle fibers to be
physically and electrically connected to each other so that the entire
heart contracts as one unit.
◉ What is the primary function of skeletal muscle? Answer: To
contract and cause movement by pulling on bones.
◉ How do skeletal muscles help maintain posture? Answer: By
making small, constant adjustments to hold the body upright or
balanced.
◉ What role do skeletal muscles play in joint stability? Answer: They
prevent excess movement of bones and joints, maintaining stability
and preventing misalignment.
◉ What are sphincters in skeletal muscles? Answer: Muscles located
at the openings of internal tracts that allow voluntary control over
bodily functions.
