C15 - Bone

Question 1

What are the functions of the bone

Answer 1

structural support in the skeleton

movement because bones are attachment site for muscles

Mineral regulations
Storage
Trapping
Regulation of the calcium concentration in the blood

Question 2

what are the two types of bone

Answer 2

spongy/ cancellous bone

Compact bone

Question 3

Where is spongy bone found

Answer 3

at the ends of the long bones and in the vertebrae.

Question 4

What is the role of Bone marrow within the network of spaces

Answer 4

to produce blood cells.

Question 5

What % of the bone in the body is made of compact bone

Answer 5

75%

Question 6

what provides blood to the bone

Answer 6

haversian canal

Question 7

where can you find a compact bone

Answer 7

surrounding most bones and gives them their white shiny appearance.😀

Question 8

what is the role of osteoblasts

Answer 8

continually build up the compact bone

Question 9

what is the role of osteoclasts

Answer 9

continually break down the compact bone

Question 10

Where are the osteoclasts found

Answer 10

they are found in a matric secreted by the osteoblasts which is
30% organic
70% inorganic

Question 11

What is a haversian system

Answer 11

the structural and functional unit of compact bone/ the osteon

Question 12

What does a haversian canal contain

Answer 12

Arteriole
Venule
Lymph
Nerve fibres

Question 13

how is a haversian system built

Answer 13

built in concentric rings

Question 14

what secrete the hydroxy apatite that makes the lamaella

Answer 14

osteoblasts

Question 15

what are the channels that radiate out of the lacunae into the bone lamella

Answer 15

Canaliculi

Question 16

What are the 2 ways that osteoblasts get their nutrients and remove waste

Answer 16

The matrix of the lamellae is slightly permeable so food and oxygen brought by the blood can diffuse through the bone to the cells

the fluid and the processes from the osteoblasts in the canaliculi exchange materials the canaliculi run through the bone matrix and those of neighbouring lacunae make contact in a 3d network

Question 17

what are cartilage bones derived from

Answer 17

hyaline cartilage in the embryo, in a process called ossification.

Question 18

how does the procesess of osificiation work

Answer 18

Cartilage cells flatten and calcium salts are deposited around them. osteoblasts secrete layers of bones
matrix around the cartilage

while osteoclasts break the cartilage down and the blood bessels invade

Question 19

why is bone described as being dynamic

Answer 19

it is constantly being broken down by osteoclasts and built by osteoblasts.