Digestive system
Nervous system
Circulatory System
Respiratory system
Excretory System
100

This organ produces bile to help digest fats.

Liver

100

This is the control center of the nervous system.

Brain

100

This organ pumps blood throughout the body.

heart

100

The main muscle used for breathing.

diaphragm

100

This organ filters blood to make urine.

kidney

200

This muscular tube moves food from the mouth to the stomach.

esophagus

200

The basic unit of the nervous system.

neuron


200

Blood vessels that carry blood away from the heart.

arteries

200

the main muscle used for breathing.

Lungs

200

The tube that carries urine from the kidney to the bladder.

ureter

300

Enzymes in this organ start breaking down carbohydrates

mouth/saliva

300

This type of neuron receives information and sends it to the brain.

sensory neuron

300

These tiny vessels allow exchange of oxygen and nutrients.

Capillaries

300

This structure prevents food from entering the trachea.

epiglottis

300

This organ stores urine before it's excreted.

Bladder

400

Most nutrient absorption happens in this organ 

small intestine

400

This type of neuron is responsible for movement and the response to the stimulus.

motor

400

This iron-rich protein carries oxygen in red blood cells.

hemoglobin

400

The tube that connects the throat to the lungs.

trachea

400

The term for maintaining a stable internal environment

Homeostasis

500

This organ absorbs water

large intestine

500

What cell carries oxygen?

Red blood cell

500

These small sacs in the lungs are where oxygen is exchanged.


alveoli