Answer:
The atria and ventricles are separated by the mitral and bicuspid valves.
Explanation:
The atria undergo atrial systole, a brief contraction of the atria that ejects blood from the atria through the valves and into the ventricles.
1. A<span>ccording to the national clearing house of alcohol and drug information (NCADI), most children under the age of 21, </span>who do not participate in drug and alcohol abuse, is virtually certain to never do so.<span>
2. T</span>he average age when youth first try alcohol is 11 years for boys and 13 <span>years for girls. The average age at which Americans begin drinking regularly in 15.9 years old.
3. Nicotine is the addictive chemical found in tobacco. </span>
C) by changing tampons frequently
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