Which of the following exemplifies a positive feedback process happening in bone mineral deposition?
A) Solubility product is reached in the tissue fluids.
B) Collagen is digested by enzymes and hydroxyapatite by hydrochloric acid.
C) Osteoblasts neutralize inhibitors that prevent bone resorption.
D) The first few crystals that form attract more calcium and phosphate.
E) Osteoclasts secrete acid phosphatase that digests collagen.
D
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Select the correct statement about testosterone control.
A) GnRH from the hypothalamus causes FSH and LH release from the anterior pituitary. B) FSH stimulates testicular production of testosterone. C) Inhibin and testosterone exert positive feedback on the hypothalamus and pituitary. D) The pineal gland is believed to be the gland that exerts the most influence in testosterone control.
The segment of the nephron between the proximal and distal tubules that loops down into the medulla of the kidney and returns back to the cortex is called the ________.
A) collecting duct B) vasa recta C) loop of Henle D) Bowman's capsule E) minor calyx
Taste buds are
A) proprioceptors. B) mechanoreceptors. C) pressure receptors. D) chemoreceptors. E) nociceptors.
Which statement about the bronchi is false?
A. The main bronchi and all of their further branches make up the bronchial tree. B. The right bronchus is slightly more horizontal than the left bronchus due to the location of the heart. C. The right and left main bronchi each enter their respective lung at the hilum. D. All of these statements are false.