Which of the following are the bone-eating (resorbing) cells?
A. Osteoprogenitor cells
B. Osteoblasts
C. Osteocytes
D. Osteoclasts
Answer: D
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Generally, a chemical buffer is described as
A. a strong acid or strong base that brings the pH of a solution to 7.0. ?B. a weak acid and weak base that help prevent big changes in pH.? C. a neutral molecule that does not influence the pH in any way.?D. a weak acid that makes a solution slightly more basic by its presence.
A photopsin is a protein
A. of a photopigment within cone photoreceptors. B. of a photopigment within rod photoreceptors. C. that is derived from Vitamin E. D. that allows ions to flow into rod and cone photoreceptors.
A 35-year-old man suffers sharp abdominal pain accompanied by hematemesis (vomiting of blood) for 2 days. He dies without seeking medical help. Autopsy findings reveal a perforated ulcer in the posterior wall of the first part of the duodenum, which damaged the artery in close proximity. Which of the following arteries was most likely ruptured?
(A) Shortgastric (B) Left gastroomental (C) Gastroduodenal (D) Splenic (E) Left gastric
Luteinizing hormone (LH) binds to interstitial (Leydig) cells and
A. increases testosterone production by the interstitial cells. B. inhibits sustentacular cells. C. promotes sperm cell production by the interstitial cells. D. decreases testosterone production by the interstitial cells. E. stimulates GnRH levels to increase in the testes.