What is the role of vitamin C in skeletal development?
a. Collagen synthesis by osteoblasts requires vitamin C.
b. Vitamin C stimulates osteoclast activity.
c. It is a structural component of hydroxyapatite.
d. It enhances the absorption of calcium from the intestines.
Answer: a. Collagen synthesis by osteoblasts requires vitamin C.
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A marathon runner was perspiring heavily. Which function of sweat was occurring?
A) Releasing heat from the body B) Absorbing enzymes into the body C) Releasing enzymes from the body D) Absorbing heat into the body
A fracture in the ________ can impair the lengthwise growth of bones in a child
A) epiphyseal plate B) osteoblasts C) periosteum D) medullary cavity E) articular cartilage
This figure depicts a typical nerve. What is indicated by number 2?
A. Perineurium B. Epineurium C. Myelin sheath D. Fascicle E. Dendrites
Which statement about red bone marrow is false?
A. Red marrow is found in the cavity of long bones. B. Red marrow produces both red and white blood cells and platelets. C. Red marrow is composed of stem cells. D. Red marrow is found in the spaces of cancellous bone.