SS

1-60 PP terms

osteocytes

mature bone cells

lucunae

Chambers occupied by osteocytes

canaliculi

tiny passageways through which cell processes of osteocytes exchange nutrients and wastes

hematopoiesis

blood cell formation

osteoporosis

a condition that results from loss of bone mineralization

osteogenesis imperfecta

hereditary collagen defect, bones are brittle, and fetus may have many bone fractures

osteoclast

break down calcified matrix

osteoblast

buildup, replace cartilage with bone tissue

vitamin d

calcium absorption deficiency causes rickets and osteomalacia

vitamin a

osteoblast and osteoclast activity; deficiency retards bone development

vitamin c

collagen synthesis; deficiency results in fragile bones

too much growth hormone in child:

gigantism

too much growth horomone in adult

acromegaly

not enough growth horomone in child:

pituitary dwarfism

thyroid horomone

causes replacement of cartilage with bone in epiphyseal plate, osteoblast activity

parathyroid hormone

stimulates osteoclast, bone breakdown

sex hormone (estrogen and testosterone)

promote bone formation, stimulate ossification of epiphyseal plates

physical stress

stimulates bone growth