Which of the following is NOT one of the five sense organs?

The heart is not considered one of the five sense organs. The five primary sense organs in humans are the skin, eyes, nose, ears, and tongue. Each of these organs plays a specific role in sensing and processing environmental stimuli: the skin detects touch, pressure, temperature, and pain; the eyes are responsible for vision; the nose is involved in the sense of smell; the ears contribute to hearing and balance; and the tongue is essential for taste.

The heart, while a vital organ for circulation and maintaining blood flow, does not have a sensory function and therefore does not fit into the category of sense organs.