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.
Answer: Informed Consent
Explanation: The principle of Informed Consent stipulates that the participants of a research or study should be provided with enough information about the resarch so that they can make well informed decisios to take part in it.
Participants should be made to understand the potential risks and benefits of participation and should be allowed to take part willinging without force or coercion.
It should be argued that Dr. Schaeffer's research violates this ethical principle of research by not informing the students about the contignecy and intending risk (subtraction of 10 points) involved in his research.
The correct answer is <span>A guideline based on a human tendency to be drawn to images, design, and graphics that are easily divided into three parts..
Basically, our minds separate each photo we're looking at into 9 squares which is the rule of the thirds and based on that there are guidelines on how to present your focal point well and similar things. It's very useful in making good photographs. </span>
Fascists believe that liberal democracy is obsolete. They regard the complete mobilization of society under a totalitarian one-party state as necessary to prepare a nation for armed conflict and to respond effectively to economic difficulties.
