Gangrene is often caused by anaerobic bacteria deep in tissues that lack adequate blood flow and adequate oxygen supply. Many times, gangrene can be treated by putting the patient into a hyperbaric chamber. Which statement best describes why this type of therapy is effective?
A) The increased pressure drives nitrogen into the system and nitrogen gas poisons the bacteria.
B) The increased pressure drives more oxygen into the bloodstream and, therefore, anaerobic bacteria cannot survive in the presence of oxygen.
C) The increased pressure creates a higher pressure in the capillaries of the tissue and drives the toxin produced by the bacteria into the bloodstream, where it is diluted.
D) The increased pressure destroys the cell wall of the bacteria.
E) When the patient is brought back to normal atmospheric pressure, carbon dioxide comes out of solution at high concentrations, which poisons the bacteria.
Ans: B) The increased pressure drives more oxygen into the bloodstream and, therefore, anaerobic bacteria cannot survive in the presence of oxygen.
You might also like to view...
Imagine that during her hunt, the same lioness wounds a gazelle. The gazelle is able to escape, but its blood pressure is rapidly decreasing as it loses blood. What can happen in the gazelle's body to increase blood pressure?
A. The pituitary gland can secrete vasopressin. B. The peripheral nervous system can signal specific arterioles to contract. C. The peripheral nervous system can signal specific arterioles to expand. D. The pituitary gland can secrete thyroid stimulating hormone (TSH).
For several weeks, someone at the lab has been stealing your lunch while you’ve been tied up in meetings or tending experiments that required close attention. Tired of spending your afternoons with a rumbling stomach, you decide to make life uncomfortable for the thief, so today you’ve seasoned your sandwich with your favorite hot sauce, made with Carolina Reaper peppers. Your mouth burns just remembering the last time you tasted a drop. What type of learning behavior are you hoping your sandwich thief will experience today?
a. operant conditioning b. cognitive learning c. classical conditioning d. habituation
How could you possibly become infected with adult tapeworms?
a) wading in contaminated water b) ingesting eggs in contaminated water c) eating freshly peeled fruit d) being bitten by a mosquito e) eating insufficiently cooked pork
Which of the following important characteristics distinguish simple multicellular organisms from complex multicellular ones?
A. cell membrane transport proteins B. ability of part of the organism to do meiosis C. cell specialization D. having a cell wall E. ability of individual cells to divide by mitosis