Lecture 17: Calcium and Phosphorus Metabolism 1

What are the major inorganic elements in the human body?

Calcium and Phosphorous

where are Calcium and Phosphorous stored the most and how much of it is stored there?

bone; has 95% of body Ca and 90% of body Pi

Where is Calcium stored mainly in the body?

bones

what are the 2 structural components of the bone?

Cortical bone (solid bone; 80% of weight) and Trabecular bone (spongy bone; 20% of weight)

what is calcium balance?

In young adults, the amount of calcium taken in is equal to the amount excreted (daily intake = daily loss).

what can lead to negative calcium balance?

Immobilization

Bed rest

Weightlessness

Disease

the bone crystal is calcium hydroxy apatite, what does that mean?

theres phosphorus and calcium inside

osteoblast

Bone forming cells (builders)

osteoclast

Bone cutting cells

osteocytes

Housekeeping bone cells

osteoprogenitor cells

precursor to osteoblast

chondrocytes

cartilage cells

Where does calcium homeostasis occur?

kidney, bone and intestine