The cells responsible for establishing the rate of a cardiac contraction are the ________.
Fill in the blank(s) with the appropriate word(s).
nodal cells
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Some researchers think pheromones are important tools in human communication. Pheromones are chemical signals that one individual sends to another
What research questions might be asked by anatomists, and what questions might be asked by physiologists, to determine if pheromones are important to humans?
The life stage at which the reproductive organs become capable ________.
A. is puberty B. is birth C. varies between males and females D. is menopause
Unlike the sensation of taste, it is NOT necessary to have the chemicals associated with smells dissolved in body fluids
Indicate whether the statement is true or false
Unassisted membrane transport can sometimes require the cell to expend energy
Indicate whether the statement is true or false