What tissue has lacunae, calcium salts, and blood vessels?

A. Elastic cartilage CT:Elastic cartilage provides flexibility and maintains shape in structures such as the external ear and epiglottis. It is not strong enough to withstand the compressive forces required at the symphysis pubis.

B. Hyaline cartilage CT:Hyaline cartilage covers articular surfaces and provides smooth movement at joints, but it lacks the tensile strength and shock absorption needed at the symphysis pubis.

C. Fibrocartilage CT:The symphysis pubis is composed of fibrocartilage, which contains dense bundles of collagen fibers. This structure allows it to resist compression and tension while providing strength and flexibility to support the pelvis.

D. Dense regular CT:Dense regular connective tissue forms tendons and ligaments, which provide strong attachment in one direction. It is not suitable for the multidirectional stress placed on the symphysis pubis.

A. The cells of the epidermis store glucose as glycogen for energy:Epidermal cells do not function as a significant glucose storage site. Glycogen storage occurs primarily in the liver and skeletal muscle, not in the skin.

B. It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism:The skin plays a critical role in synthesizing vitamin D. UVB radiation converts 7-dehydrocholesterol in the epidermis to cholecalciferol (vitamin D3), which is essential for calcium absorption and bone health.

C. It absorbs vitamin C so that the skin will not be subject to diseases:While vitamin C is important for collagen synthesis and skin health, the skin does not actively absorb vitamin C from the environment. Dietary intake is the primary source.

D. It aids in the transport of materials throughout the body:The skin does not serve as a transport system for materials like blood vessels do. Its role is mainly protective, sensory, and metabolic, not circulatory.