Melanoma is a form of skin cancer that arises from melanocytes. Melanoma is most common in Caucasians between 40 and 70 years of age. Explain why Caucasians would have a greater incidence of melanoma
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Melanoma has its beginnings in melanocytes, the skin pigment cells. These cells produce the dark protective pigment called melanin to protect against sun damage to DNA. Since the melanocytes in Caucasian people do not make as much melanin per cell as darker-skinned individuals, their melanocytes are more easily sun-damaged, resulting in damaged DNA cells that are more apt to lose genetic control of their own cell division.
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Which statement regarding the chambers of the heart is not true?
A. The atria are receiving chambers and the ventricles are pumping chambers. B. The right half of the heart contains deoxygenated blood and the left half of the heart contains oxygenated blood. C. The thickest myocardium is in the ventricles. D. All of the above statements are true. E. None of the above statements is true.
Adipose tissue is stored within the
A) medullary cavity. B) metaphysis. C) spongy bone. D) epiphysis. E) diaphysis.
Presbycusis refers to age-associated
a) progressive loss of hearing in one ear. b) progressive loss of hearing in both ears. c) progressive loss of near-vision. d) otitis media. e) vertigo.
which triangular muscle, located in the upper part of the chest, arises by three heads from ribs 3 to 5 converges on the shoulder?
a) trapezius b) deltoid c) rhomboid major d) pectoralis minor