2 Function It’s main function is Transportation Blood is used as a transport vehicletransports oxygen, nutrients, cell waste (such as Carbon dioxide), hormones and antibodies vital to maintaining homeostasis to and from cells
3 Parts of the Circulatory System Divided into three major parts:The HeartThe Blood VesselsThe Blood
4 The Major Organ-The Heart Heart acts as pumpThe heart pumps beats per minute (at rest)At REST, the heart pumps about 5 QUARTS of blood a minute.During EXTREME EXERTION (exercise) it can pump 40 quarts a minute.
5 Structure Size of your fist Large organ composed of cardiac muscle--called myocardiumEnclosed by a sac –called PERICARDIUMrich in mitochondria4 hollow chambersContain valves to keep blood flowing in ONE direction
6 The pathway looks like a circle The heart, the lungs, and the blood vessels work together to form the circle part of the circulatory system.
7 The Chambers The heart has 4 hollow chambers Upper chambers – atrium receives blood coming in from the veinsLeft & right AtriumLower chambers - ventricle squeezes blood out into the arteriesLeft & right ventricle
13 Double PumpThe two ventricles are responsible for the pumping action of the heartEach chamber pumps blood out of the heart but to different pathwaysThat is why the heart is considered to be a double pump
15 Pulmonary Circulation Movement of blood from the heart, to the lungs, and back to the heart again
16 Pulmonary Circulation Pathway 1. The right Atria receives oxygen poor blood from the body.2. blood moves to the right ventricle where it is pumped out to the lungs via pulmonary arteries3. O₂ is exchanged for CO₂4. Oxygen rich blood now leaves lungs and returns to the heart
18 Systemic CirculationSupplies nourishment to all of the tissue located throughout the body , except for the heart and lungs THIS IS THE LARGEST PATHWAY OF THE CIRCULATORY SYSTEM!
19 Systemic Circulation Pathway Oxygen rich blood returning from the lungs now enters the left atriumMoves through the valves to the left ventricleThe left ventricle pumps the oxygen rich blood out the AortaThe blood is then carried from aorta to blood vessels delivering oxygen and nutrients to ALL tissues of the bodyBlood returns (oxygen poor) back to right atria
24 Hollow tubes that circulate your blood Blood VesselsHollow tubes that circulate your bloodArteriesVeinsCapillaries
25 Arteries Carry blood AWAY from the heart Heart pumps blood Main artery called the aortaAorta divides and branchesMany smaller arteriesEach region of your body has system of arteries supplying it with fresh, oxygen-rich blood.
27 Capillaries Very thin Only one cell thick Connect arteries & veins Food and oxygen released to the body cellsCarbon dioxide and other waste products returned to the bloodstream
28 Veins Carry blood to the heart Receive blood from the capillaries Transport waste-rich/ oxygen-poor blood back to the lungs and heartValves are located inside the veinsAllow blood to move in one direction
32 BloodCarries nutrients, water, oxygen and waste products to and from your body cells.Hemoglobin, iron containing moleculeLoosely picks up oxygen in the lungsLoses oxygen in areas low in oxygen (diffuses)
33 Blood Hemoglobin carries CO2 also CO2 is a waste product of cellular work70% of CO2 combines with waterThe rest travels to the lungs
34 Blood – RBCsRed blood cells carry oxygen from the lungs to all the cells of the body.Takes carbon dioxide and transports it back to the lungsAbout 5,000,000 Red Blood Cells in ONE drop of blood.
38 Blood – Platelets and Plasma Platelets are blood cells that help stop bleedingPlasma is the liquid part of the bloodAbout half of your blood is made of plasmaThe plasma carries the blood cells throughout the bodyPlasma is made in the liver.
40 SUMMARYcopy 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
41 Some Disorders and Diseases of the Circulatory System
42 DISORDERS ATHEROSCLEROSIS Fatty deposits called plaque Builds up in walls of arteriesObstructs flowAlso a risk if clot breaks free and blocks flow elsewhere
43 Disorders (cont) Hypertension High blood pressure Hearts works harder than necessaryIncreases risk of heart attack or stroke
44 Disorders (cont) Heart Attack Atherosclerosis in coronary artery Heart muscle begins to dieSymptomsNauseaShortness of breathSevere chest painIMMEDIATE MEDICAL ATTENTION NECESSARY
45 Disorders (cont) Stroke Blood clot gets stuck in blood vessels leading to brainBrain cells die due to lack of oxygenOr blood vessel burstCan lead to paralysis,loss of ability to speakdeath
46 Collins I 4 linesDescribe the order of blood flow through the heart beginning with veinsYou can use your notes!
47 Agenda 1/6/12—Day 2Heart modelHeat dissectionReview power point
48 1. The overall function of the circulatory system is A. Gas exchangeB. TransportationC. Blood productionD. Clotting
49 2. The ___________ is the main organ of the circulatory system A. HeartB. Blood VesselsC. BloodD. Lungs
50 3. The circuit that carries blood to and from all the cells is the A. Pulmonary CirculationB. Coronary CirculationC. Blood CirculationD. Systemic Circulation
51 4. The circuit that carries blood to and from the lungs is the A. Pulmonary CirculationB. Coronary CirculationC. Blood CirculationD. Systemic Circulation
52 5. The circuit that carries the blood to and from the heart itself A. Pulmonary CirculationB. Coronary CirculationC. Blood CirculationD. Systemic Circulation
53 6. The “plumbing” of the circulatory system is the A. HeartB. LungsC. BloodD. Blood Vessels
54 7. The arteries carry blood A. Within the heartB. Away from the heartC. Toward the heartD. Oxygen poor blood
55 8. _______ join arteries and veins A. ArteriolesB. VenulesC. CapillariesD. Blood
56 9. The arteries are carrying A. Oxygen poor bloodB. Oxygen rich bloodC. Waste rich bloodD. Carbon dioxide rich blood
57 10. The ________ side of the heart deals with oxygen poor blood A. RightB. Left
58 11. The oxygen poor blood enters the heart through A. Vena Cava'sB. Pulmonary arteriesC. Pulmonary VeinsD. Aorta
59 12. The __________ pump blood out of the heart A. AortaB. Pulmonary arteryC. AtriaD. Ventricles
60 13. The largest of the three circuits is the A. PulmonaryB. CoronaryC. Systemic
61 14. Oxygen rich blood exits the lungs and enters A. Right atriaB. Left atriaC. Right ventricleD. Left ventricle
62 15. The oxygen rich blood exits the heart through the A. Left atriaB. Pulmonary ArteryC. AortaD. Coronary Artery
63 16. The oxygen poor blood leaves the right ventricle through A. Left atriaB. Pulmonary ArteryC. AortaD. Coronary Artery
64 17. Gas exchange occurs in the A. HeartB. AortaC. Superior Vena Cava'sD. Lungs
65 18. The superior Vena Cava is located A. Above the heartB. Below the heart
66 19. Blood travels in one direction due to A. Blood flowB. Blood vesselsC. The heartD. Valves
67 20. How many chambers are located in the heart A. OneB. TwoC. ThreeD. Four
68 21. The top chambers are called A. VentriclesB. Atria
69 22. The bottom chambers are called A. VentriclesB. Atria
70 23. What prevents the blood form mixing inside the heart?
71 24. How does material enter and exit the blood vessels?
72 25. Which answer shows the correct order of blood flow A. Vena cava's, r. ventricle, r. atria, pulmonary arteryB. Vena cavas, l. atria, l. ventricle, pulmonary arteryC. Vena cavas, r. atria, r. ventricle, pulmonary arteryD. Vena cava's, aorta, pulmonary artery