1. Systemic venous partial pressure oxygen is _________ alveolar partial pressur
ID: 181165 • Letter: 1
Question
1. Systemic venous partial pressure oxygen is _________ alveolar partial pressure oxygen, and systemic venous partial pressure is ________ alveolar partial pressure of CO2.
a) greater than, greater than
b) greater than, less than
c) equal to, equal to
d) less than, less than
e) less than, greater than
2. If you wanted to pick up something heavier than you pencil, you would need to have a stronger muscle contraction. In what way does your body accomplish this?
a) decrease the refractory period
b) stimulate more motor units
3. A new drug called XYZ has been produced to treat a particular disease. However the drug must be able to get into cells of the body. Which of following might increase the likelihood of XYZ getting through the cell membrane?
a) attach many negative ions to the XYZ molecules
b) attach fatty acids to the XYZ molecules
c) attach many positive ions to the XYZ molecules
d) attach two XYZ molecules together to make the XYZ molecles twice as large
c) decrease the frequency of stimulation to allow a more prolonged contraction to occur
d) block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer
e) more than one of the above is correct
Explanation / Answer
1. the option is c because the pressure needs to be equal for the proper exchange of gas between organs.
2. the option is b because the increase in the muscle contraction requires more active motor units.
3. the option is c because the cell membrane is negatively charged, so the addition of positive ions to the molecule will facilitate the movement of molecule.
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