Briefly describe the four parts of an osteon
What will be an ideal response?
Each osteon includes lamellae, lacunae, canaliculi and a Haversian canal. The lamellae are concentric rings of matrix that consist of mineral salts and collagen fibers. Lacunae are small spaces between lamellae that contain mature bone cells called osteocytes. Projecting from the lacunae are canaliculi, which are networks of minute canals containing the processes of osteocytes. Canaliculi provide routes for nutrients to reach osteocytes and for wastes to leave them. A central Haversian canal contains blood vessels and nerves.
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Joint capsules may be reinforced by bundles of strong, tough collagenous fibers called ________.
Fill in the blank(s) with the appropriate word(s).
Which is a uniquely sympathetic function?
A) regulation of pupil size B) regulation of respiratory rate C) regulation of body temperature D) regulation of cardiac rate
The release of ____ from the hypothalamus stimulates the anterior pituitary to secrete TSH
a. TIH b. TRH c. TH d. PTH
A woman with Rh- blood does not have anti-Rh antibodies in her blood unless ________.
A. she has had a previous blood transfusion B. Rh+ erythrocytes have previously been introduced into her blood C. her husband is Rh+ D. she has had an Rh+ child