When water is lost from the ECF but electrolytes are retained,
a. both ECF and ICF become more dilute
b. osmosis moves water from the ICF to the ECF
c. the osmolarity of the ECF drops
d. there is an increase in the volume of the ICF
e. water levels remain the same
B
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Which muscle extends the elbow during the action of push-ups?
A) deltoid B) trapezius C) brachialis D) triceps brachii E) biceps brachii
Severe iron deficiency and anemia will result in which of the following?
decreased oxygen carrying capacity metabolic energy limitation both a and B
The partial pressure of oxygen in atmospheric air at sea level is
A) greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest. B) less than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest. C) equal to the partial pressure of oxygen in atmospheric air at the top of Mt. Everest. D) equal to the sum of partial pressures from carbon dioxide and nitrogen. E) equal to the partial pressure of carbon dioxide in atmospheric air at the top of Mt. Everest.
Skeletal muscle myosin from lizard shows maximal ATPase activity over a wide range of temperatures. This is due to the fact that
a. in poikilothermic organisms, muscles must function over a broad range of temperatures, and myosin ATPase activity is essential for muscle function. b. at lower temperatures, myosin can uncouple from actin, and the ATPase activity can be used to generate heat without locomotion, allowing the lizard to warm up metabolically. c. both of these. d. neither of these.