2 What is the circulatory system? Circulatory System (C.S.)carries blood and dissolvedsubstances to and from every cell in the body.The Heart has the job of pumping these things aroundthe body.The Heart pumps blood and substances around thebody in tubes called blood vessels.The Heart, blood, and blood vessels together make up Circulatory System, or also called the Cardiovascular system
3 the left side of the system Our circulatory system is a double circulatory system. Meaning it has 2 parts:The Pulmonary System takes blood to the LUNGS and back to the heartThe Systemic System takes blood to the body and back to the heartthe left side of the systemdeals with oxygenated blood.the right side of the systemdeals with deoxygenated blood.
4 now lets look inside the heart… This is a vein. Veins by definition carry blood to the heartThese are arteries. Arteries carry blood away from the heart.2 atria are small, and they receive blood coming inCoronary arteries, the hearts own blood supply2 ventricles are large and pump blood out to the lungs and the bodyThe heart has four chambersnow lets look inside the heart…
5 The Heart Artery to Head and Body Vein from Head and Body Artery to LungsVein from LungsSeptum divides theheart in two, keepingThe deoxygenatedblood from mixing withthe oxygenated blood
6 A valve keeps the blood from flowing backwards. There are 4 valvesInside the heart:2 Atrioventicular valves (between the atria and the ventricles).The Tricuspid valve – rightThe Mitral valve – left2 Semilunar valves (in the Aorta and the Pulmonary Artery)The Aortic valveThe Pulmonary valve
7 How does the Heart work? STEP ONE blood from the lungs blood from the bodyblood from the lungsThe heart beat begins when theheart muscles relax and bloodflows into the atria.
8 The atria then contract and Then the SINOATRIAL NODE sends an electrical signal to the Atria to contractThe atria then contract andthe valves open to allow bloodinto the ventricles.
9 The valves close to stop blood flowing backwards.The ventricles contract forcingthe blood to leave the heart.At the same time, the atria arerelaxing and once again filling withblood.Then the Atrioventricular NODE sends an electrical signal to the ventricles to contract
10 blood from the heart gets around the body through blood vessels There are 3 types of blood vesselsa. ARTERYb VEINc CAPILLARY
11 Arteries carry blood away from the heart. The ARTERYArteries carry blood away from the heart.the elastic fibres allow the artery to stretch under pressurethick muscle and elastic fibresthe thick muscle can contract to push the blood along.
12 Veins carry blood towards the heart. The VEINVeins carry blood towards the heart.veins have valves which act to stop the blood from going in the wrong direction.thin muscle and elastic fibresbody muscles surround the veins so that when they contract to move the body, they also squeeze the veins and push the blood along the vessel.
13 The CAPILLARY Capillaries link Arteries with Veins they exchange materials between the blood and other body cells.the wall of a capillaryis only one cell thickThe exchange of materials between the blood and the body can only occur through capillaries.
14 The CAPILLARY A collection of capillaries is known as a capillary bed. arteryveincapillariesbody cell
15 what’s in BLOOD digested food & nutrients red blood cells white blood cellsBLOODoxygenwaste (urea)plateletscarbon dioxidehormonesplasma
16 The Bloodwhite blood cellred blood cellplasmaplatelets
17 Red Blood Cellscontain hemoglobin, a molecule specially designed to hold oxygen and carry it to cells that need it.a biconcave disc that is round and flat without a nucleuscan change shape to an amazing extent, without breaking, as it squeezes single file through the capillaries.
18 White Blood Cellsthere are many different types and all contain a big nucleus.the two main ones are the lymphocytes and the macrophages.macrophages ‘eat’ and digest micro-organisms .some lymphocytes fight disease by making antibodies to destroy invaders by dissolving them.other lymphocytes make antitoxins to break down poisons.
19 Platelets Platelets are bits of cell broken off larger cells. Platelets produce tiny fibrinogen fibres to form a net. This net traps other blood cells to form a blood clot.
20 Plasma It also contains useful things like; carbon dioxide glucose amino acidsproteinsmineralsvitaminshormoneswaste materialslike urea.A straw-coloured liquid that carries the cells and the platelets which help blood clot.
21 SUMMARY copy and complete the following; Arteries take blood ______ from the heart. The walls of an artery are made up of thick ________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. Blood is made up of four main things ______, the liquid part of the blood; Red Blood Cells to carry ______; White Blood cells to protect the body from disease and _________ to help blood clot.
22 SUMMARY copy and complete the following; Arteries take blood ______ from the heart. The walls of an artery are made up of thick _________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. Blood is made up of four main things ______, the liquid part of the blood; Red Blood Cells to carry ______; White Blood cells to protect the body from disease and _________ to help blood clot.awaymusculartowardscapillariesplasmaoxygenplatelets
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