BIOL251 Human Anatomy & Physiology I w/Lab 2025 Module 7 Exam Review – 110 Questions and Answers Summary (2025–2026)

BIOL251 Human Anatomy & Physiology I w/Lab 2025
Module 7 Exam Review – 110 Questions and Answers
Summary (2025–2026)


Question 1. Which molecule provides the immediate energy for muscle
contraction?
A.Glucose
B. ATP
C. Creatine
D. Glycogen
Rationale: ATP powers the cross bridge cycle allowing myosin heads to
detach and reattach during contraction.



Question 2. What neurotransmitter is released at the neuromuscular
junction?
A.Dopamine
B. Acetylcholine
C. Serotonin
D. GABA
Rationale: Motor neurons release acetylcholine which binds receptors on
muscle fibers triggering depolarization.



Question 3. Which molecule provides the immediate energy for muscle
contraction?
A.Glucose
B. ATP
C. Creatine
D. Glycogen

,Rationale: ATP powers the cross bridge cycle allowing myosin heads to
detach and reattach during contraction.



Question 4. What neurotransmitter is released at the neuromuscular
junction?
A.Dopamine
B. Acetylcholine
C. Serotonin
D. GABA
Rationale: Motor neurons release acetylcholine which binds receptors on
muscle fibers triggering depolarization.

Question 5. What neurotransmitter is released at the neuromuscular
junction?
A.Dopamine
B. Acetylcholine
C. Serotonin
D. GABA
Rationale: Motor neurons release acetylcholine which binds receptors on
muscle fibers triggering depolarization.



Question 6. Which muscle fiber type is most resistant to fatigue?
A.Fast glycolytic fibers
B. Slow oxidative fibers
C. Intermediate fibers
D. Fast oxidative fibers
Rationale: Slow oxidative fibers rely heavily on aerobic metabolism and
have many mitochondria, making them fatigue resistant.

,Question 7. Which ion directly binds to troponin to initiate skeletal muscle
contraction?
A.Sodium (Na+)
B. Calcium (Ca2+)
C. Potassium (K+)
D. Magnesium (Mg2+)
Rationale: Calcium binds to troponin, causing tropomyosin to move away
from actin binding sites so myosin can attach and begin contraction.



Question 8. Which structure forms the functional contractile unit of
skeletal muscle?
A.Myofibril
B. Sarcomere
C. Myosin filament
D. Actin filament
Rationale: The sarcomere is the repeating unit within myofibrils
responsible for muscle contraction.



Question 9. Which molecule provides the immediate energy for muscle
contraction?
A.Glucose
B. ATP
C. Creatine

, D. Glycogen
Rationale: ATP powers the cross bridge cycle allowing myosin heads to
detach and reattach during contraction.



Question 10. Which muscle fiber type is most resistant to fatigue?
A.Fast glycolytic fibers
B. Slow oxidative fibers
C. Intermediate fibers
D. Fast oxidative fibers
Rationale: Slow oxidative fibers rely heavily on aerobic metabolism and
have many mitochondria, making them fatigue resistant.



Question 11. Which ion directly binds to troponin to initiate skeletal
muscle contraction?
A.Sodium (Na+)
B. Calcium (Ca2+)
C. Potassium (K+)
D. Magnesium (Mg2+)
Rationale: Calcium binds to troponin, causing tropomyosin to move away
from actin binding sites so myosin can attach and begin contraction.



Question 12. Which muscle fiber type is most resistant to fatigue?
A.Fast glycolytic fibers
B. Slow oxidative fibers
C. Intermediate fibers
D. Fast oxidative fibers
Rationale: Slow oxidative fibers rely heavily on aerobic metabolism and
have many mitochondria, making them fatigue resistant.