1- Not a function of the skeletal system
support and protection
vascular endothelial cell formation
storage of calcium and phosphate
lipid storage in adults
none of the above

2- Bones are not
organs
made of connective tissue
made of minerals
vascularized
none of the above

3- The periosteum
is tough sheet of connective tissue
surrounds the surface of the bone
lines the medulary cavity
contains osteoclast
the fist and second answers are both correct

4- Osteogenic cells
are derived from mesenchyme
differentiate into osteoblasts and osteoclasts
are bone- building cells
initiate calcification
the fist and second answers are both correct

5- Osteocytes
are derived from immune cells
are bone-building cells
maintain bone by exchanging nutrients and waste
initiate calcification
the second and third answers are both correct

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Answers:

1- Not true about the GI track
Answer: is discontinuous only in the pharinx area

2- Accesory organs of the GI track
Answer: liver, gallblader

3- Not a secretion of the GI track
Answer: acetylcholine

4- Outermost layer of the GI track.
Answer: serosa

5- Stimulates the hypothalamus and cerebral cortex to signal for release of gastric juices
Answer: sight, smell or taste of food