What detects changes inside and around the body?

A) action potentials
B) sensory receptors
C) nerves
D) effectors

Sensory receptors are specialized cells that detect changes inside and around the body, such as changes in temperature, pressure, and chemical composition. They are located in various parts of the body, including the skin, muscles, and organs, and they send signals to the brain and spinal cord to be interpreted as sensations. Action potentials and nerves are involved in transmitting these signals to and from the sensory receptors, while effectors are the muscles and glands that produce responses to these signals.