Which reaction is exothermic?

Exothermic reactions are reactions in which energy is released in the form of light, heat, etc.

for example :-

=》CaO + H2O -> Ca(OH)2

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.