2 CirculationIn the United States of America, what do we use to transport goods?Roads, railroad tracks, and airline routes.Our body has a transportation system too which we call the circulatory system: where blood moves through our body.
3 Circulatory system It is made of your heart, blood vessels, and blood. Blood vessels carries blood throughout the body, which forms a closed circulatory system.Closed circulatory system: is where blood never leaves the blood vessels.What other organisms can you name that have a closed circulatory system?
4 Heart Its like a double pump Right side pumps blood to the lungsLeft side pumps blood to all other parts of the bodyAtrium (upper chambers): receive blood returning to the heartVentricle (lower chambers): pump blood out of the heart
5 Heart ValvesEach valve in the heart is a thin, strong flap of tissue that acts like a one-way doorTricuspid: valve between the right atrium and right ventricleBicuspid: valve between the left atrium and the left ventricleSemilunar valves: are found between the ventricles and the blood vesselsWhat is the job of the valves?The valves open and close at different times to prevent blood from flowing backward
7 Heartbeat What causes the sound of your heartbeat? It is caused by the opening and closing of the valves in the heart.
8 Blood Vessels3 types of blood vessels:ArteriesVeinsCapillaries
9 ArteriesThey are blood vessels that carries blood away from the heart.They are thick muscular walls that are strong and elastic.Each time the heat beats, blood is pushed through the heart under high pressure.Therefore their strong elastic walls allows them to stretch preventing the arteries from bursting
10 Veins They are blood vessels that carry blood to the heart. They are less muscular and their pressure exerted on veins are less than that of arteries.
11 Capillaries They connect the smallest arteries and veins together. Microscopic blood vessels that are only 1 cell thick.
12 Circulatory System Problems 1 of the leading causes of death in the US.High blood pressureCaused by the narrowing of the arteriesHardening of the arteriesCholesterol (fatty substance) build upHeart attackCaused from narrow artery blockageIf the heart doesn’t get enough blood it begins to die
13 CirculationPulmonary Circulation: pathway of blood between the heart and the lungs
14 Circulation cont.Systemic Circulation: pathway of blood between the heart and the rest of the body.
15 Blood Functions: Transportation of materials Regulate body temperature Maintain chemical balanceProtection against diseases
16 Parts of the bloodPlasmaRed blood cellsWhite blood cellsPlatelets
17 PlasmaIt is the liquid part of the blood, which is made up of 90% water.It carries dissolved vitamins, minerals, digested nutrients, wastes, and different kinds of proteins.
18 Red Blood Cells Blood gets its color from 25 trillion red blood cells. Their job is to carry oxygen, which is done so by a molecule called hemoglobin that is found on every red blood cell.Correction!!!!!!!!!!!Blood without oxygen is dark red, but never blue.
19 White Blood CellsThey are cells that defend your body against diseases.You have only 1 white blood cell for every 1000 red blood cellPhagocytes (white blood cells) surround bacteria and digest them.So why do we get pus when we get a cut?Shows that our body is fighting the infectionMade up of dead white blood cells, bacteria, and tiny pieces of dead tissue.
21 Platelets They are the part of the blood that controls clotting. Clotting: prevention of blood lossPlatelets sick together at the site of a cut and basically form a plug.
22 Blood Groups Did you know that not every person’s blood is the same? Four blood types:ABABO
23 Blood DisordersAnemia: is a disorder where blood can not carry normal amounts of O2 to body cells.Leukemia: cancer of the blood, where the body produces millions of abnormal immature white blood cells.
24 Lymphatic SystemThis system is a network of tubes that return tissue fluid (water, oxygen, carbon dioxide, nutrients, and waste) back to the blood.