the anterior pituitary releases luteinizing hormone. If the hypothalamus was not stimulated by estrogen
D is the ideal choice.
Cellular, organism, and ecosystem levels of organization range from the most basic to the most sophisticated. Chemical does not represent a level of organization.
In cardiac muscle, this joining is known as electric coupling, which enables the rapid transmission of action potentials and the synchronized contraction of the entire heart. A functional unit of contraction known as a syncytium is produced by this network of electrically coupled heart muscle cells.
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