The Heart (Cont’d)

2.3 Circulatory and Respiratory

http://www.heartpoint.com/theheart.htmlhttp://www.mydr.com.au/heart-stroke/animation-how-your-heart-pumpshttp://www.pbs.org/wgbh/nova/body/map-human-heart.htmlhttp://www.pbs.org/wgbh/nova/eheart/transplantwave.htmlhttp://www.blaufuss.org/http://www.fi.edu/learn/heart/blood/blood.html

http://www.nobelprize.org/educational/medicine/landsteiner/landsteiner.html - Challengehttp://www.mydr.com.au/addictions/animation-effects-of-smokinghttp://www.argosymedical.com/Circulatory/samples/animations/How%20the%20Heart%20Works/index.htmlhttp://www.argosymedical.com/Circulatory/samples/animations/Angioplasty/index.htmlhttp://www.argosymedical.com/Circulatory/samples/animations/CPR/index.htmlhttp://www.argosymedical.com/Circulatory/samples/animations/HIV/index.htmlhttp://www.argosymedical.com/Respiratory/samples/animations/Asthma%20TLC_AZ/index.htmlhttp://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter25/animation__gas_exchange_during_respiration.htmlhttp://video.about.com/asthma/How-Lungs-Function.htmhttp://www.youtube.com/watch?v=vu_ONM3Bj9A

Taking a closer look at the heartAtria – allow the blood to move from the body to the heartVentricles – pump blood out of the heart

The Heart (Cont’d)

Valves. Each valve allows blood to flow in only one direction

Blood Flow - Heart

The Circulatory SystemCirculatory system is a network of blood vessels that deliver blood to the bodyArteries – carry oxygenated red blood away from heart. Blood is under pressure. Aorta is the largest artery.Arterioles are small arteries. They end up at capillaires which are a network of tiny blood vessels that exchange O2 and CO2

Veins – carry blood to heartVenules – carry blood from capillaries to veins. Tiny veins.

Arteries, arterioles, capillaries, venules, and veins

Components of Blood

Blood – transports oxygen, nutrients and water to cells and carries carbon dioxide and wastes away. Also carries specialized cells to fight infections and heal wounds. 5L in body.Plasma – 55% of the blood. Clear, yellowish. Red blood cells – approx 2 million. Carry oxygen from lungs to cells and carbon dioide away from cellsWhite blood cells - fight infection. Numbers increase when you have an infectionPlatelets – clot blood

Blood Components

Respiratory System

Respiratory System – main purpose is inhaling O2 and exhaling CO2

Lungs deliver O2 Air passes past the pharynx through the larynx (voice box) and down the trachea (airway). The air splits into 2 bronchi – one for each lung. The bronchi split into smaller bronchioles until they reach alveoli where gas exchange happens. There are millions of alveoli in each lung. Each aveoli is surrounded in a capillaires for gas exchange.

Inside the Lungs

Heart and Lung

Gas Exchange