Explain why young men who take anabolic steroids (which mimic the actions of testosterone) often display stunted growth and have an overall shorter stature.
Explain how abnormal bone structure could affect muscle function.
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Key Concepts
Bone Structure
Muscle Function
Biomechanics
Lucy Dupre is a 2-year-old girl living in northern Canada. You notice that her growth seems abnormally slow and she has exhibited signs of weakened bones, including fractures. Her parents admit they have not supplemented her diet with vitamin D, as they feel that any supplementation is 'unnatural' and 'not organic.' Explain why Lucy is having problems with her bones and bone growth.
Fouz Akkad is a 6-year-old girl who has been diagnosed with a rare genetic defect in which her lysosomes are unable to maintain an acidic pH. What are lysosomes? Why do lysosomes require an acidic pH? How will this affect the ability of certain bone cells to function? What consequences will this disease have on Fouz's bones?
Match the following terms with the correct definition.
____Long bone
____Epiphysis
____Nutrient artery
____Flat bone
____Short bone
____Periosteum
____Diaphysis
____Medullary cavitya.
a. Main source of blood to the medullary cavity
b. Membrane surrounding the bone
c. Bone that is about as wide as it is long
d. Shaft of a long bone
e. Bone that is longer than it is wide
f. Canal running down the center of the diaphysis
g. End of a long bone
h. Bone that is broad and thin
Explain the differences between red bone marrow and yellow bone marrow.
Mark the following statements about bone tissue as true or false. If a statement is false, correct it to make a true statement.
a. The primary mineral in the inorganic matrix is hydroxyapatite.
