heart

a hollow muscular organ that pumps blood throughout the body

blood

functions carrying gases (co2 and o2) nutrients and waste around the body

circulatory system

carries needed materials to the body cells; carries wastes away from body cells; helps fight disease

indicator

chemical that changes its appearance in different types of solutions

btb

bromthymol blue a chemical indicator that changes its appearance when co2 is in it

co2

the gas that is produced when o2 is used to access energy from nutrients the respirtory system removes it

o2

The gas that is inhaled through the respiratory system and that is required to access energy from the nutrients that gets absorbed from the digestive system.

alveoli

Tiny sac-like air spaces in the lung where carbon dioxide and oxygen are exchanged.

trachea

The "windpipe" that connects the throat and the bronchi. Walls are made of cartilage which protect the trachea from collapsing.

lungs

The main organs of the respiratory system.

Respiratory System

The system that takes oxygen into the body and eliminates carbon dioxide.

large intestine

Absorbs water into the blood stream and prepares undigested food for elimination.

Absorption

The process by which nutrient molecules pass through the wall of the digestive system and into the blood.

Nutrients

The substances in food that give the raw material and the energy needed by the body

Pancreas

Produces digestive enzymes to further breakdown fat, proteins, and starches.

Small Intestine

Absorbs useable nutrients which are sent to all body parts by blood vessels.

Esophagus

Food passageway between mouth and stomach.

Stomach

Receives food, churns it, and adds hydrochloric acid.

Saliva

The fluid released in your mouth that begins the chemical breakdown process.

Teeth

Hold, tear, and chew food.

Digestive System

Takes food into the body, breaks down food, and absorbs the digestive material.

Chemical Breakdown

Chemicals produced by the body break food into their chemical building blocks (saliva in mouth, digestive chemicals in stomach and small intestines).

Mechanical Breakdown

Food is physically broken down into smaller pieces (teeth/jaw and stomach).

Model

Scientist use pictures, diagrams, other representation to help understand small, large, complex things or processes.

Excretory System

Removes liquid waste from the body(includes the kidneys and bladder).

Organ System

A group of organs/structures working together to perform a major function in the body.