Calcium Homestasis

Reportion (breaks down bone to release Calcium)

Bone resorption

Reduces calcium excretion

Kidney reabsorption

Vitamin D activation

Increases intestinal absorption

Put The High

Mnemonic for Parathyroid Hormone

affect storage, absorption and excretion of calcium ions

Parathyroid hormone, and calcitonin

in body fluids must be closely regulated

Calcium ion

Hormones and calcium ion are

balance

Parathyroid hormone are produced by

parathyroid glands in the neck

Increase blood calcium ion levels by

1.) Stimulating activity (indirectly)

2.) Increasing intestinal absorption of calcium by enhancing calcitriol secretion by kidneys.

3.) Decrease calcium excretion by kidneys

What is a hormone and endocrine

Calcitonin

Calcitonin secreted by C sells in

thyroid

blood calcium ion levels

Decrease

Inhibiting

osteoclast activity

Increasing calcium excretion and reducing calcitriol secretion by

kidneys

Decreasing intestinal absorption of

calcium

Low calcium level causes the parathyroid glands to secrete

(Parathyroid Gland Response)

(Increase Blood Calcium)

Parathyroid hormone

What is stimulated to release stored calcium ions from bone

(Bone Response)

(Increase Blood Calcium)

Osteoclast (Calcium released)

Intestinal absorption of Calcium (Intestinal Response)

(Increase Blood Calcium)

increases (calcium absorbed)

Kidneys absorb (Kidney’s Response)

(Increase Blood Calcium)

calcium ions (Calcium Conserved)

C cells in the thyroid gland secrete

(Decrease in blood calcium)

calcitonin (thyroid gland response)

activity decreases osteoblast activity unaffected (Bone Response)

(Decrease in Blood Calcium)

Osteoclasts (Calcium release slowed)

Intestinal absorption of calcium (Intestinal Response)

(Decrease in Blood Calcium)

decreases (Calcium absorbed slowly)

Kidney excretes (Kidneys Response)

(Decrease in Blood Calcium)

Calcium ions (Calcium excreted)

(Increased Calcium Loss in Urine)

Hyaline Cartilage makes up part of the

Embryonic Skeleton

Disintegration of Chondrocytes in the

diaphysis

Primary ossification

blood vessels penetrate the cartilage

Fibroblast migrating with

blood vessels

osteoblasts produce

spongy bone

Bone formation

spreads

Blood vessels and osteoblast migrate into

Epiphysis

Formation of spongy bone of the

epiphysis

at the metaphysis new hyaline cartilage is produced causing bone elongation (epiphyseal side)

Epiphyseal plate

Osteoblasts migrate from diaphysis and replace

cartilage (diaphysis side)

rate of cartilage production decrease and the epiphyseal plate become narrower until it disappears (epiphysial closure)

At Puberty

Only a linen remains in the

epiphyseal line: bone elongation ends

Hyaline cartilage remains at the joint

(articular cartilage)