What does this structural formula, N?N, indicate?
A) Three atoms of nitrogen are double bonded.
B) Two atoms of nitrogen share three pairs of electrons.
C) An ionic bond holds the two atoms of nitrogen together.
D) Two atoms of nitrogen are held together by hydrogen bonds.
Answer: B
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During inspiration:
a. the diaphragm contracts and moves up into the thoracic cavity b. the chest cavity expands c. the pressure in the thoracic cavity increases d. all of the above
Which occurs during the secretion of hydrochloric acid by gastric epithelial cells?
A. There is a decrease in the pH of blood in the hepatic portal circulation. B. Bicarbonate ions are secreted into the hepatic portal circulation. C. Chloride ions are pumped from the cytosol of the gastric epithelial cells into the hepatic portal circulation blood. D. Both H+ and K+ are actively pumped from the epithelial cell cytosol into the lumen of the stomach. E. Vesicles containing H+/K+ -ATP-ase proteins are endocytosed into vesicles within the gastric epithelial cells.
Why do medical personnel like to inject medications into the buttock region?
What will be an ideal response?
The changes that occur in a woman's body at menopause are due to
A. atrophy of the thermoregulatory center of the hypothalamus. B. depletion of oocyte supply. C. increased production of androgens by the adrenal gland. D. reduced levels of estrogen and progesterone. E. fluid retention that disrupts the osmotic balance of the body.