MCQ 81
What is the role of the sarcoplasm in muscle fibers?
A) Store calcium ions
B) Provide energy
C) Store glycogen and myoglobin
D) Transmit nerve impulses
Answer: C) Store glycogen and myoglobin
Explanation: Sarcoplasm contains glycogen and myoglobin, which provide energy and oxygen for muscle contraction.
MCQ 82
Which of the following is an example of a gliding joint?
A) Shoulder
B) Wrist
C) Elbow
D) Hip
Answer: B) Wrist
Explanation: The wrist contains gliding joints that allow limited movement between the small carpal bones.
MCQ 83
What is the main function of the trapezius muscle?
A) Rotate the shoulder
B) Elevate the shoulders
C) Flex the neck
D) Extend the elbow
Answer: B) Elevate the shoulders
Explanation: The trapezius muscle is responsible for shoulder elevation and assists in various shoulder and neck movements.
MCQ 84
Which type of muscle fibers are more resistant to fatigue?
A) Fast-twitch fibers
B) Slow-twitch fibers
C) Intermediate fibers
D) None of the above
Answer: B) Slow-twitch fibers
Explanation: Slow-twitch fibers are designed for endurance activities and resist fatigue better than fast-twitch fibers.
MCQ 85
What is the primary role of the rotator cuff?
A) Stabilize the shoulder
B) Flex the elbow
C) Extend the knee
D) Rotate the wrist
Answer: A) Stabilize the shoulder
Explanation: The rotator cuff consists of muscles and tendons that stabilize the shoulder joint during movement.
MCQ 86
Which of the following muscles is responsible for flexing the hip?
A) Gluteus maximus
B) Iliopsoas
C) Quadriceps
D) Hamstrings
Answer: B) Iliopsoas
Explanation: The iliopsoas muscle is the primary hip flexor, responsible for raising the knee toward the body.
MCQ 87
What is the function of the flexor carpi muscles?
A) Flex the fingers
B) Flex the wrist
C) Extend the elbow
D) Rotate the forearm
Answer: B) Flex the wrist
Explanation: The flexor carpi muscles are responsible for flexing the wrist, enabling movements like gripping.
MCQ 88
Which muscle is primarily responsible for extending the shoulder?
A) Pectoralis major
B) Latissimus dorsi
C) Deltoid
D) Supraspinatus
Answer: B) Latissimus dorsi
Explanation: The latissimus dorsi extends the shoulder joint, playing a key role in movements like pulling.
MCQ 89
What is the primary action of the serratus anterior muscle?
A) Abduct the arm
B) Rotate the scapula
C) Flex the elbow
D) Stabilize the spine
Answer: B) Rotate the scapula
Explanation: The serratus anterior muscle is responsible for protracting and rotating the scapula, important for shoulder movements.
MCQ 90
What is the main function of the gluteus maximus?
A) Flex the hip
B) Extend the hip
C) Rotate the hip
D) Abduct the hip
Answer: B) Extend the hip
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