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The Journey of an Oxygen Molecule
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The Journey of an Oxygen Molecule
Pathway of Air
Pathway of air
Firstly air enters the body through the mouth or nose, from here it moves to the pharynx (throat), passes through the larynx (voice box) and enters the trachea.
Pathway of air
Pathway of air
The trachea splits into two branches, the left and right bronchus, each bronchus divides many times into smaller branches called bronchioles.
Pathway of air
Pathway of air
Each bronchiole finally leads to a bunch of tiny air sacs, called alveoli, which inflate during inhalation, and deflate during exhalation.
Pathway of air
Pathway of air
The alveoli have walls only one cell thick. This makes the exchange surface very thin - shortening the diffusion distance across which gases have to move. This allows gaseous exchange to happen quicker.
Pathway of air
The blood cell is now oxygenated and gets pumped around the body through the arteries and to the capillaries.
Inhalation
Inhalation
Inhalation is the drawing in of breath also known as inspiration. During inspiration the lungs expand, the ribs expand and the diaphragm contracts
Exhalation
Exhalation
Exhalation is when you release air from out of your breath. Your lungs contract, your ribs contract and your diaphragm expands and goes up.
Gaseous Exchange
Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Structure of the Heart
What is actually inside the heart?
Deoxygenated blood enters the right atrium through the inferior and superior vena cava. The blood then passes through the tricuspid valve into the right ventricle which pumps the blood through the pulmonary valve and through the pulmonary artery to the lungs.
Deoxygenated blood enters the right atrium through t...
Oxygenated blood enters the left atrium through the pulmonary vein it then goes into the left ventricle passing through the mitral valve. The left ventricle is then responsible for pumping oxygenated blood to tissues all over the body.
Oxygenated blood enters the left atrium through t...
Blood Vessels
Blood vessels are found throughout the body. There are five main types of blood vessels: arteries, arterioles, capillaries, venules and veins.
Artery
Artery – Any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.
Arterioles
Arterioles – A small branch of an artery leading into capillaries.
Arterioles
Capillaries
Capillaries – Any of the fine branching blood vessels that form a network between the arterioles and venules.
Capillaries
Venules
Venules – A very small vein, especially one collecting blood from the capillaries.
Veins
Veins – Any of the tubes forming part of the blood circulation system of the body, carrying mainly oxygen-depleted blood towards the heart.