W10 Skeletal System Flashcards
(57 cards)
what are the 2 types of stem cells
mesenchymal
hematopoietic
what do mesenchymal cells differentiate to
Chondrocyte
Osteoblast
what do hematopoietic cells differentiate to
Osteoblast
what do Osteoblast diff into
osterocyte
what hormone increases the Ca2+ levels
PTH hormone
what cells secrete Ca2+ out of bones
osteoclast
where is Ca2+ stored
in the bones
what cells uptake Ca2+ into bones
osteoblast
where is calcitonin secrete from
by thyroid C-cells
what does calcitonin do
inhibits osteoclast activity
what’s the main role of the skeletal system
protect internal organs
produce blood ells
and releases fat from bone marrow
stores and releases Ca2+ and phosphates
what is the Axial Skeleton made of
Skull
Vertebrae of the spine
Thoracic cage (Ribs and sternum)
what is the Appendicular Skeleton made of
Upper and lower limbs
Pelvis
Pectoral girdle (shoulder)
what are connective tissue main components
ECM:
- fibers
- ground substance
- inorganic matrix
what are the 2 types of connective tissue
loose and dense
what type of connective tissue are skeletal tissues
dense
what are the connective tissue fibres
collagen and elastin
what does elastin help to do
recoil after stretchw
what does collagen do
provides tensile strength
what are the connective tissue ground substances
proteoglycan
water and electrolytes
what do ground substances do
provide swelling pressure
what are the outer and inner layer of the cortical bone
periosteum
endosteum
what does inorganic matrix do
make tissues hard
what are the 3 structures of the bone
cortical bone
spongy bone
bone marrow
