Skeletal muscles are held to the bones with the help of ______

Correct Answer: B

Rationale: Tendons are tough, fibrous connective tissues that attach skeletal muscles to bones, transmitting force to enable movement (e.g., Achilles tendon). Ligaments connect bones to bones, cartilage cushions joints, and joints are bone meeting points, not attachments, making 'tendons' the correct answer.

Correct Answer: A

Rationale: Lamellae are the concentric rings of bone matrix surrounding the central canal in osteons of compact bone, providing strength. Lacunae house osteocytes, canaliculi connect them, and the endosteum lines the interior, making 'lamellae' correct.

Correct Answer: D

Rationale: Osteoclasts are specialized cells that resorb or break down bone tissue, aiding in remodeling and calcium release. Osteoprogenitor cells are stem cells, osteoblasts build bone, and osteocytes maintain it, making 'osteoclasts' correct.

Correct Answer: C

Rationale: Older people require greater vitamin D and calcium intake to maintain bone density, as absorption decreases and osteoporosis risk rises with age. Younger individuals need less supplementation due to higher efficiency, making 'greater than' likely correct (incomplete options assumed).

Correct Answer: B

Rationale: The occipital bone forms the posterior skull base and back, including the foramen magnum. The ethmoid is anterior, parietal is lateral, and sphenoid is central, making 'occipital' correct.