science 9

• Trachea is the empty tube that serves as passageway of

  air into the lungs.
• Bronchi are the two branching tubes that

  connect the trachea to the lungs
• Bronchioles are the hair like tubes that connect to the alveoli.
• Alveoli are the air sacs that allow gas exchange in the lungs.
• When you breathe in, or inhale, the diaphragm muscle contracts.
• When you breathe out, or exhale, the diaphragm muscle relaxes.
• The circulatory system is the life support structure that nourishes your cells with nutrients from the food you eat and oxygen from the air you breathe.
• The three major parts of the circulatory system are the heart, blood

  vessel and blood.
• The heart pumps the blood throughout the body.
• The blood vessel carries the blood throughout the body.
• The arteries carry oxygenated blood away from the heart to the cells,

  tissues and organs in the body.
• The veins carry deoxygenated blood to the heart.
• The capillaries are the smallest blood vessels in the body, connecting

  the smallest arteries to the smallest veins. It is the actual site where

  gases and nutrients are exchanged.
• Blood transports the materials throughout the body.
• The heart is a hollow muscular organ, about the size of your fist, which

  is located in the center of your chest between the lungs. It is a double

  pump that pumps on the left and right sides.
• The top chamber is the atrium (plural: atria). The bottom chamber is

  called the ventricle. The valve acts a one – door, allowing blood to flow

  either forward into the next chamber, or out of the heart.
• Air first enters your lungs and then into the left part of your heart. It is then driven by your heart into the bloodstream, all the way through your body.
• oxygen processes the nutrients to release energy.
• .Carbon dioxide is given off during this process. The blood delivers carbon dioxide into the right portion of your heart, from which it is pumped to the lungs. Carbon dioxide leaves your body through the lungs when you exhale.
• Heart tirelessly contracts (squeezes) to push blood around the body between 60 to 70 times a minute.
• Aorta - the main artery that carries oxygen rich blood away from the heart
• Artery - one of the tube-like vessels that carry oxygenated (filled with oxygen) blood away from the heart
• Atrium - one of the top chambers of the heart, blood flows into the right atrium from the body and into the left atrium from the lungs
• Blood - the liquid that circulates in the heart, arteries, and veins, carries oxygen, carbon dioxide, and other nutrients around the body
• Capillary - any of the tiny, thin walled tubes that carry blood between arteries and veins, location of gas and nutrient exchange
• Circulation - the movement of blood through the vessels of the body that is induced by the pumping action of the heart and serves to distribute nutrients and oxygen to and remove waste products from all parts of the body
• Circulatory system - the body system made up of the heart, the blood vessels and the lungs. It has two main functions: deliver oxygen and other nutrients to the cells of the body and remove waste products
• Exercise - being physically active in order to stay healthy. Examples of exercise are jogging, lifting weights, aerobics, dancing
• Flow - The movement of a volume of a liquid or gas over time
• Heart beat - the pulsation of the heart
• Heart rate - is the number of times the heart beats per minute also known as pulse
• Pulmonary circulation - circulation of blood between the heart and lungs. Deoxygenated blood goes out the pulmonary aorta and returns, oxygenated, in the pulmonary vein.
• Pulsation - 1 : rhythmical throbbing or vibrating (as of an artery) also : a single beat or throb. 2 : a periodically recurring alternate increase and decrease of a quantity (such as pressure, volume, or voltage)
• Pulse - a rhythmical throbbing of the arteries as blood is propelled through them, typically as felt in the wrists or neck.
• Red blood cell - red blood cells contain hemoglobin which allows them to carry oxygen
• Vein - one of the tube-like vessels that carries deoxygenated (filled with carbon dioxide and other cell wastes and lacking oxygen) blood from the capillaries toward the heart
• Ventricle - the bottom chamber of the heart that receives blood from the atrium. The right ventricle pumps blood into the pulmonary artery and the left pumps blood into the aorta
• White blood cell - a blood cell that does not contain hemoglobin; plays a major role in defending your body against germs (bacteria & viruses).
• Asthma is a condition in which your airways narrow and swell and produce extra mucus. This can make breathing difficult and trigger coughing, wheezing and shortness of breath.
• Pneumonia is an infection that inflames the air sacs in one or both lungs.