Blood cell formation occurs in:

(a) Yellow bone marrow

(b) Red bone marrow

(c) The matrix of bone tissue

(d) The ground substance of bones

Two-thirds of the weight of bone is accounted for by:

(a) Crystals of calcium phosphate

(b) Collagen fibers

(c) Osteocytes

(d) Calcium carbonate

The membrane found wrapping the bones, except within the joint cavity, is the:

(a) Periosteum

(b) Endosteum

(c) Perforating fibers

(d) A, b, and c are correct

The basic functional unit of compact bone is the Haversian system or:

(a) Osteocyte

(b) Osteoclast

(c) Osteon

(d) Osseous matrix

(e) Osseous lamellae

The vitamins essential for normal adult bone maintenance and repair are:

(a) A and E

(b) C and D3

(c) B and E

(d) B complex and K

The hormones that coordinate the storage, absorption, and excretion of calcium ions are:

(a) Growth hormone and thyroxine

(b) Calcitonin and parathyroid hormone

(c) Calcitriol and cholecalciferol

(d) Estrogens and androgens