Which statement correctly explains why hair appears the way it does?
A) Kinky hair has flat, ribbonlike hair shafts.
B) Perfectly round hair shafts result in wavy hair.
C) Air bubbles in the hair shaft cause straight hair.
D) Gray hair is the result of hormonal action altering the chemical composition of melanin.
A) Kinky hair has flat, ribbonlike hair shafts.
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Bones of the skull that articulate with the zygomatic bone include (the)
A) sphenoid. B) temporal bone. C) frontal bone. D) maxillary bone. E) All of the answers are correct.
In the regulation of body temperature, which organ systems contain the receptors?
A) Cardiovascular and nervous B) Nervous and integumentary C) Skeletal and integumentary D) Muscular and nervous
Leukemia is a cancer of
A. the blood. B. connective tissue. C. the brain. D. epithelial tissue.
Which of the following is needed for milk ejection from the breasts?
A. Oxytocin B. Estrogen C. Colostrum D. Prolactin