Composition of bone marrow is

Correct Answer: B

Rationale: Bone marrow consists of adipose tissue (yellow marrow, fat storage), areolar tissue (loose connective tissue supporting structure), and blood (red marrow, site of hematopoiesis producing blood cells). Fibroblasts are present but not a major component, making B the most complete and accurate description.

Correct Answer: B

Rationale: The human spine (vertebral column) consists of 33 bones: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused into the sacrum), and 4 coccygeal (fused into the coccyx). In adults, the sacral and coccygeal bones fuse, but the total count remains 33 individual vertebrae.

Correct Answer: C

Rationale: The human skull comprises 22 bones: 8 cranial bones (protecting the brain) and 14 facial bones (structuring the face). 2 is far too low (perhaps confusing cranial/facial sections), and 12 undercounts the total.

Correct Answer: B

Rationale: The foramen magnum, located in the occipital bone, is the large opening at the skull’s base through which the spinal cord passes to connect with the brainstem. 'Maximum' is not an anatomical term here.

Correct Answer: B

Rationale: The nucleus pulposus, the inner core of an intervertebral disc, is gelatinous and elastic, allowing flexibility and shock absorption. The anulus fibrosus, the outer fibrous ring, is tougher and less elastic, providing strength.