Dalton's law states that: a. The total pressure of a gas ...

[cmoore54]

Dalton's law states that:
 
  a. The total pressure of a gas mixture equals the sum of the partial pressure of each constituent gas in the mixture.
  b. The pressure within a liquid sphere is in-fluenced by the surface tension forces of the liquid and the size of the sphere.
  c. There is a direct relationship between the absolute pressure of a gas and its temper-ature.
  d. The volume of a gas is inversely related to its pressure.

Question 2

What types of patients are treated with hyperbaric oxygen therapy?
 
  1. Deep sea diving patients with decompression sickness
  2. Those with thermal injuries
  3. Patients with carbon monoxide poisoning
  4. Those with refractory osteomyelitis
  a. 1, 2, and 3 c. 2, 3, and 4
  b. 1, 2, and 4 d. 1, 2, 3, and 4

[brittanywood]

Answer to Question 1

ANS: A
Dalton's law states that the sum of the partial pressures of a gas mixture equals the total pressure of the system. Laplace's law states that the pressure within a liquid sphere is influenced by the surface tension forces of the liquid and the size of the sphere. Gay-Lussac demonstrated that if the volume of a gas is held constant, the gas pressure rises as the absolute temperature of the gas increases. Boyle's law states that when the temperature is held constant, the volume that a gas occupies is inversely proportional to the absolute pressure exerted on it.

Answer to Question 2

ANS: D
Decompression sickness arises from the generation of nitrogen bubbles in the vascular system and tissues in volumes sufficient to interfere with the function of an organ. The cause of gas bubble formation is the rapid decompression during ascent from diving when the speed of decompres-sion exceeds the ability of the gas-saturated tissues to vent the gases by simple diffusion. For this type of patient, hyperbaric oxygen will reduce the size of the bubbles. For thermal injuries, hy-perbaric oxygen limits the progression of the burn injury, reduces swelling, and may reduce the need for surgical intervention. For CO poisoning, hyperbaric oxygen promotes the dissociation of carboxyhemoglobin more than just oxygen alone. For refractory osteomyelitis, hyperbaric oxygen provides periodic elevation of bone and tissue oxygen tension from hypoxic levels to normal or supranormal levels, which promotes collagen production by fibroblasts.