BIOL 252 Human Anatomy & Physiology II w/Lab
Final Exam Questions and Answers Summary |
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CONNECTIVE TISSUE & MUSCLE
A student is studying the extracellular matrix of connective tissue and encounters
glycosaminoglycans (GAGs) within the ground substance. What is the primary
physiological role of these molecules in connective tissue?
a. They provide tensile strength to the tissue
b. They attract positive ions and water
c. They facilitate cell-to-cell communication
d. They serve as an energy reserve for cells
✔️ Correct Answer: B
Rationale: Glycosaminoglycans (GAGs) are long, unbranched polysaccharide
chains that carry a net negative charge due to their sulfate and carboxyl groups.
This negative charge attracts positively charged ions such as sodium (Na⁺), which
in turn creates an osmotic gradient that draws water into the extracellular space.
The resulting hydration of the ground substance gives connective tissues their
characteristic viscosity, resilience, and cushioning properties, enabling them to
withstand compressive forces and provide a supportive environment for cells.
,Without GAGs, tissues would lack the ability to maintain hydration and resist
mechanical stress.
A student examining muscle tissue under a microscope identifies organized
protein structures within the muscle fibers. What is the correct term for these
contractile organelles?
a. Sarcomeres
b. Myofibrils
c. Myofilaments
d. Sarcoplasmic reticulum
✔️ Correct Answer: B
Rationale: Myofibrils are the specialized contractile organelles within muscle
fibers that consist of organized arrays of proteins, primarily actin and myosin.
These structures are arranged in repeating units called sarcomeres, which are the
fundamental functional units of muscle contraction. Myofibrils are responsible for
the striated appearance of skeletal and cardiac muscle. While sarcomeres are the
repeating segments within myofibrils and myofilaments are the individual protein
filaments, myofibrils represent the complete organelle that performs the
contractile function.
A histology student identifies a layer of connective tissue surrounding an
individual muscle fiber. What is the correct anatomical term for this structure?
, a. Perimysium
b. Epimysium
c. Endomysium
d. Fascia
✔️ Correct Answer: C
Rationale: The endomysium is the delicate layer of areolar connective tissue that
surrounds each individual muscle fiber (cell). It contains reticular fibers, capillaries,
and nerve endings that provide structural support, facilitate nutrient exchange,
and help transmit contractile force generated by the muscle fiber. The perimysium
surrounds bundles of muscle fibers called fascicles, while the epimysium encases
the entire muscle. The endomysium is the innermost connective tissue layer that
directly contacts the sarcolemma of the muscle fiber, providing insulation and
support at the cellular level.
A researcher is comparing muscle tissue types and notes that one type has fused
cells without gap junctions. Which muscle type does this describe?
a. Cardiac muscle
b. Smooth muscle
c. Skeletal muscle
d. Both cardiac and smooth muscle
✔️ Correct Answer: C
Rationale: Skeletal muscle fibers are formed through the fusion of multiple
myoblasts during embryonic development, resulting in multinucleated cells that
are not connected to one another via gap junctions. Instead, each skeletal muscle
fiber functions independently and requires direct neural stimulation from a motor
neuron to contract. In contrast, cardiac muscle cells are connected by intercalated
Final Exam Questions and Answers Summary |
Portage Learning | For Better Grades A+ Pass
2026/2027 Frequently Most Tested Questions and
100% Accurate From Past papers | Graded A+ ,
Reviewed and Updated | 100% Guarantee Pass |
Latest Exam and Newest Version!!!
CONNECTIVE TISSUE & MUSCLE
A student is studying the extracellular matrix of connective tissue and encounters
glycosaminoglycans (GAGs) within the ground substance. What is the primary
physiological role of these molecules in connective tissue?
a. They provide tensile strength to the tissue
b. They attract positive ions and water
c. They facilitate cell-to-cell communication
d. They serve as an energy reserve for cells
✔️ Correct Answer: B
Rationale: Glycosaminoglycans (GAGs) are long, unbranched polysaccharide
chains that carry a net negative charge due to their sulfate and carboxyl groups.
This negative charge attracts positively charged ions such as sodium (Na⁺), which
in turn creates an osmotic gradient that draws water into the extracellular space.
The resulting hydration of the ground substance gives connective tissues their
characteristic viscosity, resilience, and cushioning properties, enabling them to
withstand compressive forces and provide a supportive environment for cells.
,Without GAGs, tissues would lack the ability to maintain hydration and resist
mechanical stress.
A student examining muscle tissue under a microscope identifies organized
protein structures within the muscle fibers. What is the correct term for these
contractile organelles?
a. Sarcomeres
b. Myofibrils
c. Myofilaments
d. Sarcoplasmic reticulum
✔️ Correct Answer: B
Rationale: Myofibrils are the specialized contractile organelles within muscle
fibers that consist of organized arrays of proteins, primarily actin and myosin.
These structures are arranged in repeating units called sarcomeres, which are the
fundamental functional units of muscle contraction. Myofibrils are responsible for
the striated appearance of skeletal and cardiac muscle. While sarcomeres are the
repeating segments within myofibrils and myofilaments are the individual protein
filaments, myofibrils represent the complete organelle that performs the
contractile function.
A histology student identifies a layer of connective tissue surrounding an
individual muscle fiber. What is the correct anatomical term for this structure?
, a. Perimysium
b. Epimysium
c. Endomysium
d. Fascia
✔️ Correct Answer: C
Rationale: The endomysium is the delicate layer of areolar connective tissue that
surrounds each individual muscle fiber (cell). It contains reticular fibers, capillaries,
and nerve endings that provide structural support, facilitate nutrient exchange,
and help transmit contractile force generated by the muscle fiber. The perimysium
surrounds bundles of muscle fibers called fascicles, while the epimysium encases
the entire muscle. The endomysium is the innermost connective tissue layer that
directly contacts the sarcolemma of the muscle fiber, providing insulation and
support at the cellular level.
A researcher is comparing muscle tissue types and notes that one type has fused
cells without gap junctions. Which muscle type does this describe?
a. Cardiac muscle
b. Smooth muscle
c. Skeletal muscle
d. Both cardiac and smooth muscle
✔️ Correct Answer: C
Rationale: Skeletal muscle fibers are formed through the fusion of multiple
myoblasts during embryonic development, resulting in multinucleated cells that
are not connected to one another via gap junctions. Instead, each skeletal muscle
fiber functions independently and requires direct neural stimulation from a motor
neuron to contract. In contrast, cardiac muscle cells are connected by intercalated
