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.
A behavior that increases the probability of an unintended injury is unsafe act. The term "unintentional" refers to injuries that were not planned. Unintentional injuries are described as situations in which the following conditions occur: the damage occurs in a brief period of time - seconds or minutes; and the detrimental outcome was not sought.
Among the most common causes of accidental injuries in the US are motor vehicle accidents, suffocation, drowning, poisoning, fire/burns, falls, and sports and recreational activities. Observations behavior that are neither intentional nor done on purpose result in unintentional damage. Injuries have an effect on everyone.
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<span>The respiratory system of the body can be injured by volcanic ash that comes from a volcanic eruption. You can inhale this ash and it can get into your body and system and mess with your inner organs. I don't see how this can happen with boulders and rocks, as they are way too big to be inhaled the way ash can be.</span>
7. C
8. B
9. B
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