Isotopes have different numbers of ________; thus they also have different ________
A) protons; atomic numbers
B) neutrons; atomic masses
C) electrons; atomic numbers
D) protons; atomic masses
E) neutrons; atomic numbers
B
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The respiratory center is most likely to increase the breathing rate if the
A. pH of body fluids is decreasing. B. pH of body fluids is increasing. C. concentration of carbonic acid is decreasing. D. concentration of sodium bicarbonate is increasing.
One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentration gradient. Initially, this substance's concentrations in the filtrate and extracellular fluid are equal. Later, however, the active transport of Na+ and other solutes creates a gradient by removing water from the lumen of the tubule where it is located. What substance
is this? A) urea B) glucose and calcium C) glucose D) glucose, calcium, and urea E) calcium
Which factor below does not slow down gastric activities?
a. enterogastric reflex b. enterogastrones c. secretin d. gastrin e. cholecystokinin
When does an ovum finish meiosis?
A. While in a tertiary follicle B. While in a secondary follicle C. During implantation D. During fertilization E. While in a primary follicle