Na (atomic no. 11 ) reacts with Cl (atomic no. 17 ) to become stable. In the reaction, Na will ________, while Cl will ________
A) give up one electron; accept one electron
B) become an anion; become a cation
C) accept one electron; give up one electron
D) give up one proton; accept one proton
E) share one electron with chlorine; share one electron with sodium
A
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The two principal types of cells found in nervous tissues are
a) neuroglial cells and neurons. b) neurons and mast cells. c) neurons and dendritic cells. d) neuroglial cells and myofibers. e) neurons and somites.
The conjunctiva is composed of _____ epithelium
A. simple squamous B. simple cuboidal C. stratified squamous D. simple columnar E. stratified keratinized
The airplane you are riding suddenly depressurizes at 10,000 feet in the air. This causes the PO2 of the airplane's air to drastically decrease. You pass out before you can put on your oxygen mask. After a few seconds, the PO2 in your alveoli rapidly drops to 60 mmHg instead of the normal 104 mmHg. How will this affect blood gas concentrations?
A. Blood PO2 will become low and much less oxygen will be delivered to tissues until cabin pressure returns. B. PO2 in the alveoli will be so low that oxygen will diffuse from hemoglobin into the alveoli, where it is exhaled. This causes blood oxygen concentrations to drop throughout the body. C. PO2 in the alveoli will be too low for gas exchange to even occur, so tissues will receive no oxygen during the depressurization event. D. Blood PCO2 will increase because the air contains less oxygen.
How is autocrine regulation best described?
A. Chemical regulators are released directly into blood vessels. B. Chemical regulators released by cells affect the functional status of different kinds of cells in the vicinity of the secretory cell. C. Chemical regulators affect the same cells that produce them. D. Chemical regulators reach their site of action through a duct. E. Chemical regulators are continuously released in constant amounts by the cell.