I'm not sure if this is correct, but the answer I got was: endoplasmic reticulum.
I hope this helps, and have a good night! :D
Answer:
Answer is Sinoatrial node, SA.
Explanation:
The sinoatrial node, SA, is known to be a group of cells which are found at the top of the heart.
The electrical signal that is initiated by the sinoatrial node bring about or stimulates the atria and then the ventricle of the heart.
It should be noted that, the sinoatrial node are regarded as the pacemaker cells.
An explanation of how the natural world works.
A downhill skier traveling down a hill has a large amount of kinetic energy because of their mass and high velocity.
Answer:
An electromagnetic wave is a wave that can travel through empty space and through matter.
Explanation:
