MCQ 71
What type of joint is found at the elbow?
A) Hinge joint
B) Ball-and-socket joint
C) Pivot joint
D) Gliding joint
Answer: A) Hinge joint
Explanation: The elbow is a hinge joint, allowing movement primarily in one direction (flexion and extension).
MCQ 72
Which muscle group is primarily engaged when performing squats?
A) Quadriceps
B) Hamstrings
C) Gluteals
D) All of the above
Answer: D) All of the above
Explanation: Squats engage multiple muscle groups, including the quadriceps, hamstrings, and gluteals, for lower body strength.
MCQ 73
What is the main function of the biceps brachii muscle?
A) Extend the elbow
B) Flex the shoulder
C) Flex the elbow
D) Rotate the shoulder
Answer: C) Flex the elbow
Explanation: The biceps brachii primarily functions to flex the elbow and assist with shoulder flexion.
MCQ 74
What is the main function of the diaphragm during respiration?
A) Contract to increase thoracic volume
B) Relax to decrease thoracic volume
C) Filter air
D) Produce mucus
Answer: A) Contract to increase thoracic volume
Explanation: The diaphragm contracts to increase the volume of the thoracic cavity, allowing air to flow into the lungs during inhalation.
MCQ 75
What type of muscle contraction is used to maintain posture?
A) Eccentric
B) Isometric
C) Isotonic
D) Concentric
Answer: B) Isometric
Explanation: Isometric contractions maintain muscle tension without changing muscle length, which is crucial for maintaining posture.
MCQ 76
Which part of the body has the highest concentration of fast-twitch muscle fibers?
A) Arms
B) Legs
C) Back
D) Abdomen
Answer: B) Legs
Explanation: The legs generally have a higher concentration of fast-twitch muscle fibers, enabling explosive movements like sprinting and jumping.
MCQ 77
What type of exercise is primarily anaerobic?
A) Marathon running
B) Weightlifting
C) Swimming
D) Cycling
Answer: B) Weightlifting
Explanation: Weightlifting primarily relies on anaerobic energy systems for short bursts of high-intensity effort.
MCQ 78
What term describes the process of muscle fibers contracting in response to a nerve impulse?
A) Contraction
B) Innervation
C) Recruitment
D) Extension
Answer: B) Innervation
Explanation: Innervation refers to the supply of nerves to a muscle, allowing it to contract in response to neural signals.
MCQ 79
Which joint movement decreases the angle between two body parts?
A) Extension
B) Flexion
C) Abduction
D) Adduction
Answer: B) Flexion
Explanation: Flexion reduces the angle between two body parts, such as bending the knee or elbow.
MCQ 80
What is the primary energy source for muscle contraction during prolonged aerobic exercise?
A) Creatine phosphate
B) Glucose
C) Fatty acids
D) Lactate
Answer: C) Fatty acids
Explanation: Fatty acids are the primary fuel source during prolonged aerobic exercise, providing sustained energy.
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