Components of a bone

Question 1

What is the bone matrix

Answer 1

calcium phosphate and collagen fibres (complex proteins) have osteoblasts embedded

Question 2

when do the osteoblasts mature and what do they become?

Answer 2

they mature once they have been surrpunded by calcified bone matrix. become osteocytes

Question 3

function of collagen fibres

Answer 3

provide the tissue with strength and structural support

Question 4

what surrounds the collagen fibres and makes the bone very hard

Answer 4

hydroxyaptite crystals (Calcium Phosphate)

Question 5

are osteoclasts more or less common than osteoblasts

Answer 5

less common

Question 6

where are osteoclasts found?

Answer 6

edge of each piece of bone

Question 7

function of osteoclasts

Answer 7

eat away at surface of bone > remodelling of the bone > necessary for growth of the bone

Question 8

what family of cells do the osteoclasts belong to?

Answer 8

phagocytes

Question 9

what two hormones control the balance between bone formation and bone destruction

Answer 9

calcitonin and parathyroid hormone (PTH)

Question 10

what gland produces calcitonin and what does this hormone promote? does this decrease or increase calcium?

Answer 10

thyroid gland, bone growth, decreases calcium (ca taken up into bones). think of calcium toning down calcitonin

Question 11

what gland produces PTH and what does this hormone promote?

Answer 11

parathyroid glands which sit on the back of the thyroid gland, bone degradation

Question 12

what activity does PTH increase

Answer 12

Osteoclast

Question 13

if there was a rise in ca2+ in blood, what happens

Answer 13

thyroid gland stimulated > increase in osteoblast activity >calcitonin > calcitonin stimulates calcium salt deposit in bone