A. Pacemaker cells located in the atria fire before the pacemaker cells in the ventricles. B. It takes time for hormones to diffuse from the atria to the ventricles to trigger contraction. C.The electrical signal generated in the right atrium is delayed at the AV node before passing to the ventricles. D.The ventricular muscle cells contract more slowly than the atrial muscle cells.
The body utilizes ATP that is stored in the muscles to perform anaerobic exercises. ATP stands for Adenosine Triphosphate which is a complex organic chemical - the source of energy that keeps everything going. The ATP is used for many cell functions including transport work moving substances across cell membranes, mechanical work, supplying the energy needed for muscle contraction...
Answer:
they provide a nutrient-rich environment that facilitates growth and because they confer resistance to antibiotics.
Explanation:
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