Which of the following statements concerning the principal fiber bundles of the peridontal liagments is true?
(a) they are composed of elastin
(b) they extend from the cementum to the enamel
(c) they extend from the dentin to the cementum
(d) they are composed of collagen
(e) they extend from one tooth to the next
Ans: (d) they are composed of collagen
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Only autosomal trisomies involving chromosomes 13, 18, and 21 are survivable. Why is this?
A. These are relatively short chromosomes. B. These are relatively long chromosomes. C. These are relatively gene-poor chromosomes. D. These are redundant chromosomes. E. These chromosomes have no genes.
When monocytes migrate into the interstitial spaces, they are called ________.
Fill in the blank(s) with the appropriate word(s).
Receptors for the regulation of body temperature are heat and cold receptors in the skin, the CNS, and internal organs.
Answer the following statement true (T) or false (F)
The diagram illustrates accessory structures of the skin. What does "D" represent?
A. Hair follicle B. Duct of eccrine sweat gland C. Sweat pore D. Eccrine sweat gland E. Sebaceous gland