MCQ 51
What is the primary function of the skeletal muscle?
A) Produce hormones
B) Generate heat
C) Protect internal organs
D) All of the above
Answer: B) Generate heat
Explanation: Skeletal muscles generate heat through contraction, helping maintain body temperature.
MCQ 52
Which muscle is primarily responsible for plantarflexion of the foot?
A) Tibialis anterior
B) Gastrocnemius
C) Soleus
D) B and C
Answer: D) B and C
Explanation: Both the gastrocnemius and soleus muscles contribute to plantarflexion, pointing the toes downward.
MCQ 53
What type of exercise primarily promotes cardiovascular fitness?
A) Strength training
B) Flexibility exercises
C) Aerobic exercises
D) Balance training
Answer: C) Aerobic exercises
Explanation: Aerobic exercises, such as running or swimming, improve cardiovascular endurance by increasing heart and lung efficiency.
MCQ 54
What is the primary role of ATP in muscle contraction?
A) Store calcium
B) Supply energy
C) Transport oxygen
D) Release neurotransmitters
Answer: B) Supply energy
Explanation: ATP provides the necessary energy for muscle contraction, enabling myosin to pull on actin filaments.
MCQ 55
What movement occurs when a person raises their shoulder towards their ears?
A) Abduction
B) Elevation
C) Depression
D) Rotation
Answer: B) Elevation
Explanation: Elevation involves moving a body part superiorly, such as raising the shoulders.
MCQ 56
What is the primary function of the flexor muscles?
A) Extend joints
B) Flex joints
C) Rotate joints
D) Stabilize joints
Answer: B) Flex joints
Explanation: Flexor muscles are responsible for decreasing the angle at joints, such as bending the elbow or knee.
MCQ 57
Which of the following is a feature of slow-twitch muscle fibers?
A) Fast contraction speed
B) High fatigue resistance
C) Low oxygen supply
D) Large diameter
Answer: B) High fatigue resistance
Explanation: Slow-twitch fibers are designed for endurance activities, as they resist fatigue and rely on aerobic metabolism.
MCQ 58
What type of joint allows for rotational movement in the neck?
A) Hinge joint
B) Ball-and-socket joint
C) Pivot joint
D) Ellipsoidal joint
Answer: C) Pivot joint
Explanation: Pivot joints permit rotational movement, such as the atlas and axis vertebrae in the neck.
MCQ 59
Which structure serves as the attachment point for muscles to bones?
A) Ligament
B) Tendon
C) Cartilage
D) Synovial membrane
Answer: B) Tendon
Explanation: Tendons connect muscles to bones, enabling movement by transmitting the force generated by muscles.
MCQ 60
What term describes a muscle’s ability to stretch and return to its original length?
A) Elasticity
B) Contractility
C) Extensibility
D) Excitability
Answer: A) Elasticity
Explanation: Elasticity is the ability of a muscle to return to its original length after being stretched.
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