What Are They?
Structure
Teaming Up
Common Diseases
Fun Facts
100

This sense helps us detect light and colors.

What is vision?

100

This transparent part of the eye protects the front and helps focus light.

What is the cornea?

100

This system works closely with special senses like vision and smell to send quick signals to the brain.

What is the nervous system?

100

This condition causes dizziness or a spinning sensation, often affecting the inner ear.

What is vertigo?

100

This sense is the only one fully developed at birth.

What is hearing?

200

This sense lets us enjoy our favorite foods and beverages by identifying sweet, salty, bitter, sour, and umami tastes.

What is taste?

200

The ear is mostly made up of this connective tissue.

What is cartilage?

200

Special senses like taste and smell are also linked to this system that controls hunger and thirst.

What is the digestive system?

200

This condition, commonly called “pink eye,” affects the clear tissue covering the eye.

What is conjunctivitis?

200

You have about 10,000 of these on your tongue, which help you taste your favorite foods.

What are taste buds?

300

This sense allows us to hear sounds and understand speech.

What is hearing?

300

These structures in the nose are responsible for detecting odor molecules. (Hint: they are _______ receptors!)

What are olfactory receptors?

300

Balance, managed by the inner ear, directly helps this body system that lets you move and walk.

What is the muscular system?

300

This is the fastest-growing part of your body and is also essential for balancing.

What is the inner ear?

400

This sense is used to detect smells, such as the scent of flowers or food.

What is smell?

400

This is a muscular organ in your mouth that facilitates eating, speaking, swallowing, and more.

What is the tongue?

400

Pain sensed in the eye or ear when you have an infection signals this system to start fighting the problem.

What is the immune system?

400

Your eyes can distinguish about this many different colors.

What is 1 million?

500

This sense allows us to balance and understand the position of our head in space.

What is equilibrium (or balance)?

500

These are called globular organs, meaning they have a round shape.

What are the eyes?

500

Special senses like vision rely on this system to deliver oxygen and nutrients to the eye.

What is the circulatory system?

500

The human nose can detect over this many different scents.

What is 1 trillion?