BIOS 255 Anatomy & Physiology III
Exam 4 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A - Chamberlain
1. Which type of muscle tissue is voluntary and striated?
A. Skeletal muscle
B. Cardiac muscle
C. Smooth muscle
D. Myocardium
Correct Answer: A. Skeletal muscle
Rationale: Skeletal muscle is controlled voluntarily and shows
striations under a microscope.
2. Which type of muscle tissue is involuntary and non-striated?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Tendon
Correct Answer: A. Smooth muscle
,Rationale: Smooth muscle controls organs and vessels involuntarily
without striations.
3. Which type of muscle tissue is involuntary and striated?
A. Cardiac muscle
B. Skeletal muscle
C. Smooth muscle
D. Ligament
Correct Answer: A. Cardiac muscle
Rationale: Cardiac muscle contracts involuntarily and has
striations.
4. The functional unit of a skeletal muscle fiber is called:
A. Sarcomere
B. Myofibril
C. Sarcolemma
D. Mitochondrion
Correct Answer: A. Sarcomere
Rationale: Sarcomeres are repeating contractile units of muscle
fibers.
5. The protein responsible for thick filaments in muscle is:
A. Myosin
B. Actin
C. Tropomyosin
,D. Troponin
Correct Answer: A. Myosin
Rationale: Myosin forms the thick filament in sarcomeres.
6. The protein responsible for thin filaments in muscle is:
A. Actin
B. Myosin
C. Tropomyosin
D. Titin
Correct Answer: A. Actin
Rationale: Actin forms thin filaments in the sarcomere.
7. Tropomyosin and troponin regulate muscle contraction by:
A. Controlling actin-myosin interaction
B. Producing ATP
C. Anchoring muscle to bone
D. Stabilizing sarcolemma
Correct Answer: A. Controlling actin-myosin interaction
Rationale: These regulatory proteins prevent or allow cross-bridge
formation.
8. The neurotransmitter that stimulates skeletal muscle
contraction is:
A. Acetylcholine (ACh)
B. Norepinephrine
, C. Dopamine
D. Serotonin
Correct Answer: A. Acetylcholine (ACh)
Rationale: ACh binds to receptors on the sarcolemma, initiating
contraction.
9. The energy molecule used directly for muscle contraction is:
A. ATP
B. ADP
C. Glucose
D. Creatine
Correct Answer: A. ATP
Rationale: ATP provides energy for cross-bridge cycling.
10. Muscle fatigue is primarily caused by:
A. Lactic acid accumulation
B. Lack of oxygen
C. Excess ATP
D. Excess calcium
Correct Answer: A. Lactic acid accumulation
Rationale: Lactic acid buildup lowers pH and reduces contraction
efficiency.
11. The smallest structural unit of a bone is:
Exam 4 (Latest Update )
Anatomy and Physiology IV with Lab |
Questions & Answers | 100% Correct |
Grade A - Chamberlain
1. Which type of muscle tissue is voluntary and striated?
A. Skeletal muscle
B. Cardiac muscle
C. Smooth muscle
D. Myocardium
Correct Answer: A. Skeletal muscle
Rationale: Skeletal muscle is controlled voluntarily and shows
striations under a microscope.
2. Which type of muscle tissue is involuntary and non-striated?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Tendon
Correct Answer: A. Smooth muscle
,Rationale: Smooth muscle controls organs and vessels involuntarily
without striations.
3. Which type of muscle tissue is involuntary and striated?
A. Cardiac muscle
B. Skeletal muscle
C. Smooth muscle
D. Ligament
Correct Answer: A. Cardiac muscle
Rationale: Cardiac muscle contracts involuntarily and has
striations.
4. The functional unit of a skeletal muscle fiber is called:
A. Sarcomere
B. Myofibril
C. Sarcolemma
D. Mitochondrion
Correct Answer: A. Sarcomere
Rationale: Sarcomeres are repeating contractile units of muscle
fibers.
5. The protein responsible for thick filaments in muscle is:
A. Myosin
B. Actin
C. Tropomyosin
,D. Troponin
Correct Answer: A. Myosin
Rationale: Myosin forms the thick filament in sarcomeres.
6. The protein responsible for thin filaments in muscle is:
A. Actin
B. Myosin
C. Tropomyosin
D. Titin
Correct Answer: A. Actin
Rationale: Actin forms thin filaments in the sarcomere.
7. Tropomyosin and troponin regulate muscle contraction by:
A. Controlling actin-myosin interaction
B. Producing ATP
C. Anchoring muscle to bone
D. Stabilizing sarcolemma
Correct Answer: A. Controlling actin-myosin interaction
Rationale: These regulatory proteins prevent or allow cross-bridge
formation.
8. The neurotransmitter that stimulates skeletal muscle
contraction is:
A. Acetylcholine (ACh)
B. Norepinephrine
, C. Dopamine
D. Serotonin
Correct Answer: A. Acetylcholine (ACh)
Rationale: ACh binds to receptors on the sarcolemma, initiating
contraction.
9. The energy molecule used directly for muscle contraction is:
A. ATP
B. ADP
C. Glucose
D. Creatine
Correct Answer: A. ATP
Rationale: ATP provides energy for cross-bridge cycling.
10. Muscle fatigue is primarily caused by:
A. Lactic acid accumulation
B. Lack of oxygen
C. Excess ATP
D. Excess calcium
Correct Answer: A. Lactic acid accumulation
Rationale: Lactic acid buildup lowers pH and reduces contraction
efficiency.
11. The smallest structural unit of a bone is:
