The greatest risk factor for skin cancer is
A. exposure to UV light rays.
B. low skin hydration levels.
C. being a female.
D. advanced age.
E. using excessive sun block.
Answer: A
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Histology is the study of the __________.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. The word “articulation” is another word for joint. 2. The interaction between muscle and bone allows the body to move. 3. The function of hematopoiesis is accomplished in the osteon of the bone. 4. In the adult skeleton, the function of hematopoiesis occurs in the medullary canal. 5. Between the two diaphyses of a long bone is the epiphysis.
Why can't tetany of the heart occur?
a. there are no distinct motor units in the heart. b. there is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c. the refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction. d. the heart contracts with maximal force every beat so it is impossible to increase the strength of cardiac contraction. e. vagal stimulation slows down the heart rate to prevent summation of contractions.
All of the following are true of the allantois except
A) it derives partly from endoderm. B) it projects into the umbilical stalk. C) it derives partly from mesoderm. D) part will develop as the urinary bladder. E) it acts as the fetal bone marrow.