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.
The Court that is established by the Constitution and so cannot be abolished by Congressional law is the<u> Supreme Court </u>
The U.S. Constitution:
- Established the Supreme Court.
- Gave Congress the power to create federal courts that are below the Supreme Court.
This means that Congress can abolish every other federal court apart from the Supreme Court because they created it but they cannot abolish the Supreme Court unless an amendment to the Constitution was made.
In conclusion, the answer is the Supreme Court.
Find out more about the creation of the Supreme Court at brainly.com/question/932365.
Maybe because we don’t know about the past and we should get more into it to see what things change and what we do differently now from what we did back then
