The correct answer is letter A
Sinoatrial node (SA) or pacemaker or sino-atrial node: special region of the heart, which controls the heart rate. It is located near the junction between the right atrium and the superior vena cava and consists of a cluster of specialized muscle cells. The rhythmic frequency of these muscle fibers is approximately 72 contractions per minute, while the atrial muscle contracts about 60 times per minute and the ventricular muscle, about 20 times per minute. Due to the fact that the sinoatrial node has a faster rhythmic frequency in relation to the other parts of the heart, the impulses originating from it spread to the atria and ventricles, stimulating these areas so quickly, so that the rhythm of the SA node becomes the rhythm of the whole heart; that's why it's called a pacemaker.
<em>Answer:</em>
<em>need; drive</em>
<em>Explanation:</em>
<em><u>According to psychologists,</u></em><em> a need is described as an individual's psychological feature that tends to arouse him or her to act in order to meet a goal and the reason for the given action gives direction and purpose to a specific behavior.</em>
<em><u>Drive</u></em><em> is described as an individual's urgent requirement or basic need that is considered as crucial for satisfaction, generally, it is being rooted in a few psychological imbalance, tension, or deficiency.</em>
<em><u>As per the question, Reiko's exhaustion is a need and going back home to sleep is a drive.</u></em>
<span>So according to punishment should be imposed based on the degree of the injury by the offender rather than the intent of the criminal. The punishment is the avoidance and not an act of revenge and the it should prevent the people from committing the crimes.</span>
Answer:
<u>Cooperative interaction</u>
Explanation:
When people are not in conflict, they may cooperate
Peter the Great (l) aka Peter Alexeyevich
