KEY WORDS

• Antagonistic Muscle Pairs - muscles that work in opposite directions to produce a movement, so when one contracts, the other relaxes
• Balanced Diet - A diet that provides all the nutrients needed for good health.
• Oxygen - the unreactive gas that makes up most of the air around us
• carbon Dioxide (CO2) - This gas is a waste product of respiration
• Alveoli - The air sacs where oxygen enters and the carbon dioxide leaves the blood
• Blood capillary - the tiny blood vessel that surrounds the alveoli
• deoxygenated blood - blood that contains less oxygen and is deep red (but its represented as blue in diagrams
• oxygenated blood - blood that contains oxygen gas is bright red
• nitrogen - the gas that isused in the body to release energy from food
• peak flow - the maximum rate of blood flow across an area or tissue.
• Vital capacity - The maximum amount of air a person can expel from the lungs after a maximum inhalation
• ventilation - when something has little holes in it for air or gas to get through, it is ventilated