Which muscle has a convergent pattern of fascicles?

Correct Answer: C

Rationale: A convergent fascicle pattern features fibers converging from a broad origin to a narrow insertion, like a fan, maximizing force direction versatility, as in the pectoralis major, which spans the chest to insert on the humerus. Biceps brachii has parallel fascicles along its length. Gluteus maximus is multipennate, with angled fibers for power. Rectus femoris has a bipennate structure, not convergent. Pectoralis major's triangular, convergent design, enabling shoulder adduction and flexion, matches this pattern, making 'c' correct.

Correct Answer: B

Rationale: The gastrocnemius, a two-headed muscle overlying soleus, is the largest in the lower leg, spanning from femoral condyles to the Achilles tendon, driving plantarflexion (e.g., calf raises). Soleus , beneath it, is smaller but assists. Tibialis anterior dorsiflexes, and tibialis posterior inverts both are slimmer. Gastrocnemius's bulk and superficial prominence, critical for locomotion, make 'b' the correct answer.

Correct Answer: B

Rationale: The body of a cervical vertebra (C3-C7) is oval-shaped when viewed superiorly, wider side-to-side than front-to-back, supporting the neck's weight and mobility. Round doesn't fit cervical bodies aren't circular. Heart-shaped applies more to sacral vertebrae in some contexts, not cervical. Triangular describes vertebral foramina, not bodies. The oval shape, seen in anatomical diagrams, optimizes load distribution and flexibility, making 'b' the correct description.

Correct Answer: B

Rationale: Abduction moves limbs or fingers away from the midline, like spreading arms or fanning fingers, driven by muscles like deltoid or abductor digiti minimi. Adduction brings them toward the midline. Rotation twists around an axis. Extension straightens joints. Abduction's lateral movement, per anatomical planes, makes 'b' the correct action.

Correct Answer: A

Rationale: A tissue is a group of similar cells with a common function, like muscle or epithelial tissue, forming the basic structural units between individual cells and organs in the body's hierarchy. A type of organ is incorrect organs comprise multiple tissues (e.g., skin includes epithelium and connective tissue). A fluid might describe blood, a tissue, but not all tissues are fluids (e.g., bone). A structural protein like collagen exists within tissues, not as tissue itself. The definition of tissue as cellular aggregates with shared roles, per histology, makes 'a' the correct answer.