Exercise:
The disorder in which bones are porous and thin but bone composition normal is
a) osteomalcia
b) osteoporosis
c) rickets
d) arthritis
The organic portion of bone’s matrix is important in providing all but……
a) tensile strength
b) hardness
c) to resist stretch
d) flexibility
The remodeling of bone is a function of which cells.
a) chondrocytes and oesteocytes
b) osteoblasts and osteoclasts
c) chondroblasts and osteoclasts
d) osteoblasts and oesteocytes
In skeleton muscle, calcium facilitates contraction by binding to……..
a) tropomycin
b) actin
c) toponin
d) myosin
Which of the following statements concerning the role of calcium ions in the contraction of skeletal muscle is correct?
a) the mitochondria act as a store of Ca+2 for the contractile process
b) Ca+2 entry across the plasma membrane is important in sustain the contraction skeleton muscle
c) a rise in intracellular Ca+2 allows actin to interact with myosin
d) the tension of a skeletal muscle fibre is partly regulated by proteins
