MCQ 11
Which type of muscle tissue is involuntary and found in the walls of hollow organs?
A) Skeletal
B) Cardiac
C) Smooth
D) Epithelial
Answer: C) Smooth
Explanation: Smooth muscle is involuntary and located in the walls of hollow organs, such as the intestines and blood vessels.
MCQ 12
What connects bone to bone at a joint?
A) Tendon
B) Ligament
C) Cartilage
D) Synovial fluid
Answer: B) Ligament
Explanation: Ligaments are strong, flexible tissues that connect bones to other bones at joints.
MCQ 13
Which structure in the muscle fiber stores calcium ions?
A) Sarcolemma
B) Myofibril
C) Sarcoplasmic reticulum
D) Mitochondria
Answer: C) Sarcoplasmic reticulum
Explanation: The sarcoplasmic reticulum is an organelle that stores calcium ions, which are essential for muscle contraction.
MCQ 14
Which of the following movements decreases the angle between body parts?
A) Extension
B) Flexion
C) Abduction
D) Adduction
Answer: B) Flexion
Explanation: Flexion is the movement that reduces the angle between two body parts, such as bending the elbow.
MCQ 15
Which joint is primarily responsible for the rotation of the head?
A) Hinge joint
B) Ball-and-socket joint
C) Pivot joint
D) Gliding joint
Answer: C) Pivot joint
Explanation: Pivot joints allow for rotational movement, such as the joint between the first and second cervical vertebrae that enables head rotation.
MCQ 16
What is the main purpose of the skeletal system in locomotion?
A) Protection of organs
B) Storage of minerals
C) Movement and support
D) Blood cell production
Answer: C) Movement and support
Explanation: The skeletal system provides a framework that supports the body and facilitates movement through the attachment of muscles.
MCQ 17
What is the term for the rhythmic contraction and relaxation of muscles?
A) Peristalsis
B) Tetanus
C) Isotonic
D) Synergism
Answer: A) Peristalsis
Explanation: Peristalsis refers to the wave-like muscle contractions that move food through the digestive tract.
MCQ 18
Which muscle type is responsible for the heartbeat?
A) Smooth
B) Skeletal
C) Cardiac
D) Voluntary
Answer: C) Cardiac
Explanation: Cardiac muscle is specialized for continuous contraction and is responsible for pumping blood throughout the body.
MCQ 19
What kind of lever system is used when a person performs a bicep curl?
A) First-class lever
B) Second-class lever
C) Third-class lever
D) None of the above
Answer: C) Third-class lever
Explanation: In a third-class lever, the effort is applied between the load and the fulcrum, as in a bicep curl where the elbow acts as the fulcrum.
MCQ 20
What is the basic unit of contraction in muscle fibers?
A) Myofibril
B) Sarcomere
C) Muscle fiber
D) Fascicle
Answer: B) Sarcomere
Explanation: The sarcomere is the smallest unit of muscle contraction, defined by the region between two Z lines.
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