A bone shaft is the diaphysis; the expanded parts at the ends are the epiphyses.
Answer the following statement true (T) or false (F)
True
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Vitamin D deficiency, especially in older people, results from lack of exposure to the sun.
Answer the following statement true (T) or false (F)
Which bone forms the prominence of the cheek?
A) sphenoid bone B) temporal bone C) palatine bone D) zygomatic bone
The pharyngoesophageal sphincter is normally closed to prevent
a. air from entering the esophagus during breathing b. gastric contents from refluxing back into the esophagus c. vomiting d. esophageal secretions from leaking into the stomach e. food from entering the pharynx
Large cells that nourish developing sperm cells and form the blood-testes barrier are:
A) primary spermatocytes. B) Sertoli cells. C) spermatids. D) spermatogonia. E) sperm cells.