CH. 7 - Part D - RELAY

Vitamin D

A hormone important for bone building and maintenance, produced via sunlight conversion in the skin.

Calcidiol

The chemical formed in the liver from vitamin D3 before being converted to calcitriol in the kidneys.

Calcitriol

The active form of vitamin D, produced in the kidneys, which the body can use.

Rickets

A disorder that results from vitamin D deficiency during childhood, causing soft bones and bowed legs.

Melanin

A pigment that helps absorb sunlight and provides protection against ultraviolet rays; affects vitamin D production.

Osteoblasts

Cells responsible for the formation of new bone.

Osteoclasts

Cells that break down old bone as part of the bone remodeling process.

Negative feedback loop

A biological mechanism that helps maintain homeostasis, such as regulating calcium levels in the bloodstream.

Bone remodeling

The ongoing process where new bone is formed and old bone is broken down.

Calcium

An essential mineral involved in various bodily functions, including nerve impulses, muscle contractions, and blood clotting.

Physical stress

The mechanical load applied to bones, which stimulates bone remodeling and strength.

Bone fractures

Breaks in bone tissue that initiate a repair process involving bone remodeling.