Skeletal Muscle Anatomy and Function Quiz

Skeletal muscles do not produce red blood cells, which is a function of bone marrow.

Skeletal muscles primarily facilitate voluntary movement, including locomotion and manipulation.

The biceps brachii muscle is primarily responsible for flexing the forearm at the elbow joint.

The rectus femoris muscle is one of the four muscles that make up the quadriceps muscle group located in the front of the thigh.

Teres major is not part of the rotator cuff; the rotator cuff muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis.

The tibialis anterior muscle is primarily responsible for dorsiflexion of the foot, pulling the foot upward toward the shin.

The psoas major muscle, along with the iliacus, is primarily responsible for flexion of the thigh at the hip joint.

Myosin is the primary contractile protein in skeletal muscles, forming cross-bridges with actin during contraction.

Sarcomere is the basic functional unit of skeletal muscle, consisting of actin and myosin filaments.

Endomysium is the connective tissue that surrounds individual muscle fibers within a skeletal muscle.

The insertion of a muscle is the point where it attaches to the bone that moves during muscle contraction.

Type III muscle fibers do not exist; there are only Type I (slow-twitch) and Type II (fast-twitch) fibers.

Sarcomere is the functional unit of a skeletal muscle, where contraction occurs.

Slow-twitch (Type I) muscle fibers have high fatigue resistance and are suited for prolonged, low-intensity activities such as endurance running.

Acetylcholine is released by motor neurons at the neuromuscular junction to initiate muscle contraction by depolarizing the muscle fiber membrane.

During muscle contraction, the distance between the Z-lines (sarcomere length) decreases as actin and myosin filaments slide past each other.

Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, triggering muscle contraction.

The latissimus dorsi muscle is responsible for adduction of the arm at the shoulder joint, pulling the arm toward the body's midline.

Tetany is a condition characterized by involuntary and sustained muscle contractions or spasms due to abnormalities in calcium ion regulation.