Digestive System
Circulatory System
Nervous System
Muscular System
Integumentary System
100

This organ is responsible for absorbing most of the nutrients from food

What is the Small Intestine?

100

Blood vessels that carry blood away from the heart.

What are Arteries?

100

This part of the nervous system consists of the brain and spinal cord

What is the Central Nervous System?

100

This type of muscle is found only in the heart.

What are Cardiac Muscles?

100

This is the largest organ in the human body.

What is the skin?

200

This is the name of the green fluid produced by the liver that helps break down fats?

What is Chyme?

200

This component of blood is responsible for carrying oxygen.

What are Red Blood Cells?

200

This long fiber of a neuron that carries messages away from the cell body.

What is the Axon?

200

Type of muscle movement under your conscious control. 

What is Voluntary Movement?

200

This is the primary function of sweat glands

What is to Regulate Body Temperature?

300

These structures in the small intestine increases surface area for nutrient absorption

What are Villi?

300

The upper chambers of the heart are called this.

What are Atriums?

300

A quick, automatic response to a stimulus is called this.

What is a Reflex?

300

Skeletal muscles often work in _______.

What are Pairs?

300

The protein that makes skin, hair, and nails tough and waterproof.

What is Keratin?

400

The process of chemical digestion begins here.

What is the mouth?

400

This blood component helps the body form clots to stop bleeding.

What are Platelets?

400

These protect the spinal cord.

What are Vertebrae?

400

 Muscles that control endurance are often called this.

What are Slow-Twitch fibers?

400

This is the outermost, thin layer of the skin.

What is the Epidermis?

500

The "trapdoor" that prevents food from entering the windpipe is called this.

Epiglottis

500

The iron-containing protein in red blood cells is called this.

What is Hemoglobin?

500

These neurons carry information from the senses to the brain.

What are Sensory Neurons?

500

These are the three types of muscles.

What are Skeletal, Cardiac, and Smooth muscles?

500

The pigment that gives skin its color and protects against UV rays.

What is Melanin?

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