How is heart rate controlled by the nervous system in an intact organism?
What will be an ideal response?
Neurons around the sinoatrial node release acetylcholine, which slows the heart rate, and norepinephrine, which speeds it up.
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The three hormonal factors that influence Ca2+ metabolism are ____________________, ____________________, and ____________________
Fill in the blank(s) with correct word
What do muscarine and nicotine have in common?
What will be an ideal response?
What must happen before a body cell can begin mitotic cell division?
A)Its DNA must be replicated exactly so that identical copies of the cell's genes can be passed on to each of its offspring. B)The DNA undergoes mutation in order to increase variation in the cell population. C)Its DNA must be divided in half so that half can go to one daughter cell and half can go to the other daughter cell. D)The DNA is expelled from the cell so that it will not be affected by the division process.
Epithelial cells lining the internal passageways of the genitourinary tract usually have ________ at their free surface
A) mitochondria B) cilia C) microvilli D) junctional complexes E) Golgi complexes