Factors of Bone Growth

Question 1

Factors of Bone Growth

Answer 1

Calcium levels in blood and the pull of gravity and muscles

Question 2

Role of Vitamin D

Answer 2

Increases absorbtion rate of calcium.

Question 3

Bone Growth in Length Steps

Answer 3

1. Production of cartilage at the epiphyseal plate. Cartilage will grow as bone grows
2. Older cartilage will calcify (Become bone tissue)
3. New bone tissue is developed under new cartilage.

Question 4

Appositional Growth

Answer 4

Growth in diameter–not length

Question 5

Fracture Repair step 1

Answer 5

Blood vessels rupture and form a blood clot (hematoma) around the fracture to stop bleeding

Question 6

Fracture Repair Step 2

Answer 6

Cartilage and connective tissue replaces the clot, forming a soft callus that will bridge the gap between broken bones.

Question 7

Fracture Repair Step 3

Answer 7

Soft callus is gradually replaced by hard bony callus. (This process will differ in length based on severity)

Question 8

Fracture Repair Step 4

Answer 8

Hard callus will eventually be reshaped and remodeled by osteoblasts and clasts to restore the original shape and strength.

Question 9

What occurs when the calcium concentration in the blood stream is too low?

Answer 9

This means that it is hypocalcemic.
1. Parathyroid senses low calcium and secretes PTH
2. PTH stimulates the osteoclasts
3. Osteoclasts chew up the bone, releasing calcium.
4. Bone breakdown
5. Blood calcium levels go back up.

Question 10

What occurs when the calcium concentration in the blood stream is too high?

Answer 10

This means that it is hypercalcemic.
1. Thyroid gland senses high calcium and secretes calcitonin
2. Calcitonin stimulates osteoblasts
3. Osteoblasts build more bone, using calcium
4. Bone building
5. Blood calcium levels go back down.