MCQ 21
Which type of joint allows for sliding movements?
A) Hinge joint
B) Ball-and-socket joint
C) Gliding joint
D) Pivot joint
Answer: C) Gliding joint
Explanation: Gliding joints allow for limited sliding movements between flat or slightly curved surfaces, such as in the wrists and ankles.
MCQ 22
Which protein forms the thin filament in muscle fibers?
A) Myosin
B) Actin
C) Troponin
D) Titin
Answer: B) Actin
Explanation: Actin is the primary protein that makes up the thin filaments in muscle fibers and plays a key role in contraction.
MCQ 23
What is the primary function of synovial fluid?
A) Store nutrients
B) Lubricate joints
C) Transmit signals
D) Protect organs
Answer: B) Lubricate joints
Explanation: Synovial fluid reduces friction between the articular cartilage of synovial joints during movement.
MCQ 24
Which of the following structures protects the ends of bones at a joint?
A) Tendon
B) Ligament
C) Cartilage
D) Synovium
Answer: C) Cartilage
Explanation: Cartilage provides a smooth surface for joint movement and absorbs shock, protecting the ends of bones.
MCQ 25
What is the primary role of myoglobin in muscle cells?
A) Store calcium
B) Store oxygen
C) Produce ATP
D) Facilitate movement
Answer: B) Store oxygen
Explanation: Myoglobin is a protein in muscle cells that binds oxygen, facilitating its storage and use during muscle contraction.
MCQ 26
Which type of joint allows for angular movements?
A) Hinge joint
B) Ball-and-socket joint
C) Both A and B
D) None of the above
Answer: C) Both A and B
Explanation: Both hinge joints (like the elbow) and ball-and-socket joints (like the shoulder) allow for various types of angular movements.
MCQ 27
Which condition results from prolonged muscle contraction?
A) Muscle strain
B) Muscle atrophy
C) Muscle fatigue
D) Muscle hypertrophy
Answer: C) Muscle fatigue
Explanation: Muscle fatigue occurs when a muscle is overworked, leading to a decrease in its ability to contract effectively.
MCQ 28
What type of muscle contraction occurs without changing muscle length?
A) Isometric
B) Isotonic
C) Eccentric
D) Concentric
Answer: A) Isometric
Explanation: Isometric contraction involves muscle tension without changing its length, such as holding a weight in place.
MCQ 29
What type of movement occurs when you lift your arms sideways?
A) Flexion
B) Extension
C) Abduction
D) Adduction
Answer: C) Abduction
Explanation: Abduction refers to moving a limb away from the midline of the body, such as raising arms sideways.
MCQ 30
Which of the following is a characteristic of skeletal muscle?
A) Involuntary control
B) Striated appearance
C) Single nucleus
D) Spindle-shaped fibers
Answer: B) Striated appearance
Explanation: Skeletal muscle is characterized by a striated appearance due to the organized arrangement of actin and myosin filaments.
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