The body of a cervical vertebra is in which shape?

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: 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.

Correct Answer: C

Rationale: The stratum basale, the deepest epidermal layer, produces new skin cells via mitosis of basal keratinocytes, regenerating the epidermis as cells move upward. Stratum corneum is dead, keratinized cells. Stratum granulosum is for keratinization, not division. Stratum spinosum strengthens, not generates. The basale's role as the proliferative base, per skin histology, makes 'c' correct.

Correct Answer: D

Rationale: The skeletal system's primary functions include all: hormone production (e.g., osteocalcin from osteoblasts), blood cell production (marrow in long bones), and protection/support (e.g., skull, rib cage), a comprehensive role. No single function excludes others bones multitask. This broad scope, per skeletal physiology, makes 'd' correct.

Correct Answer: B

Rationale: The axial skeleton includes the skull, vertebral column, and rib cage, forming the body's central axis for support/protection. Appendicular is limbs/girdles. Pectoral and pelvic girdles are appendicular parts. Axial's midline role, per skeletal division, makes 'b' correct.