Humans perceive the world through the five senses

How much do you know about your senses? Humans typically have five senses: sight, hearing, touch, smell, and taste.

Eyes are like cameras. The lenses at the front of the eye project what one looks at to the back of their eye. The eye's main lens is called the cornea. Which is a clear dome in the middle of the eye. Cells in the eye’s retina are called rods and cones. Rods function in dim light but can't distinguish colors. On the other hand, cones can distinguish colors but can't work in dim light. This is why humans can't see in the dark.

Just as eyes facilitate sight, ears helps humans hear. What is visible on the outside of the head is just one of three parts of the ear called the “outer ear”. The outer ear is just like a funnel, while most of the ear is inside the head. The middle ear enables people to hear clearly. Sounds entering the middle ear shake an organ called eardrum and move it rapidly. The third part of the ear, the inner ear is made up of a curly tube full of fluid called the cochlea. Small hairs wiggle in the innner ear and as they move, they signal nerves and the brain.

Next is the sense of touch, which is caused by receptors all the skin. These receptors alert the brain if one touches something and feels pain, or a specific temperature. There are two main receptors in the skin called meissner's corpus, which detects light touch and merlel's disk, which detects steady pressure.

To smell, the olfactory nerve needs to work properly. This nerve reacts to small traces of chemicals in the air and is located at the top of the nose.

Smell helps humans to taste, the fifth and final sense. For example, humans can plug their noses to avoid tasting something they don't like. The tongue has taste receptors called taste buds that react to sweet, salty, bitter, and sour foods.

Sight, hearing, touch, smell, and taste are not the only senses humans possess, however other, less-known senses are pain and balance organs, which are located in the ear.

Humans experience the world around them through the senses. Just think–‒to read this article, you’ve relied on your sight!

[Source: The Big Book Of Knowledge]