In the cathode ray tube experiment, cathode rays deflected towards the positive plate. This shows that
cathode rays:

d.) circle motion requires a force to give it a centripetal acceleration.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

level 4 to level 2 : ))