Humans at Deep Sea (Lecture 19) Flashcards
______ states that pressure and volume have an inverse relationship.
Boyle’s law
True or False: Increased pressure can collapse the air chambers of the diver’s body, especially lungs
True
______ is high alveolar gas pressure.
Hyperbarism
What gases are divers exposed to?
Nitrogen
Oxygen
Carbon dioxide
True or False: To keep a human’s lungs from collapsing, air must be supplied at very high pressure to keep lungs inflated
True
True or False: Several hours are required for the gas pressures of nitrogen in all the body tissues to come to equilibrium with nitrogen in the alveoli
True
What percent of air is nitrogen?
78%
True or False: Alters ionic conductance through the membranes and reduces neuronal excitability.
True
What are the effects at 1hr beneath the sea.
120 feet: first symptoms - joviality, carelessness
150-200 feet: drowsy
200-250 feet: strength decreases considerably
+250 feet: unable to perform tasks
What are the symptoms of high tissue PO2.
Nausea
Muscle twitching
Disorientation
Brain seizures
Coma
True or False: tissues contain antioxidants than can rapidly remove free radicals before they have effects on tissues.
True
True or False: At high alveolar PO2 levels, the hemoglobin oxygen buffering mechanisms fail and tissue PO2 rises also increasing free radicals
True
True or False: Depth alone does not increase carbon dioxide partial pressure in alveoli and depth does not increase the rate of carbon dioxide production.
True
True or False: Decompression of the diver after excess exposure to high pressure is important
True
True or False: Nitrogen remains in body tissues until nitrogen pressure in lungs decreases
True
