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33.1 Overview

33.1 Overview. Blood circulates through our entire body - Internal transportation Blood is pumped by heart and carries…. Oxygen Nutrients Hormones Waste Products To the cells in our body……. Components of Circulatory System Blood Heart Blood Vessels

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33.1 Overview

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  1. 33.1 Overview • Blood circulates through our entire body - Internal transportation • Blood is pumped by heart and carries…. • Oxygen • Nutrients • Hormones • Waste Products To the cells in our body…… Components of Circulatory System Blood Heart Blood Vessels What are the 3 main types of blood vessels?

  2. Human HEART Your heart is composed almost entirely of ______. Powerful contractions of the myocardium (heart muscle) pump blood through the circulatory system.

  3. Structure of the HEART 2 Sided Pump Right: body  heart  lungs Left: lungs  heart  to body Upper Chambers Atria (R/L Atrium) Receive blood Lower Chambers Ventricles (R/L Ventricle) Pump blood out of heart

  4. The Chambers & The Valves or Bicuspid Valve

  5. Pathways of Circulation PULMONARY SYSTEMIC • Carries blood between HEART & ____________ • O2 poor blood • Pulmonary Arteries to lungs • Returns oxygenated through Pulmonary Veins to heart • Carries blood from L.V. to the R.A. (TO BODY CELLS) • O2 rich blood leaving the heart • Supplies every organ with blood, including heart

  6. Blood Vessels! • Blood: heart → body • Tough and flexible • O2 RICH blood except… • Largest Artery? Capillaries– thin vessels, O2 and nutrients diffuse into tissues; single file Blood: body → heart Thinner and less elastic O2 Poor Large veins contain valves Muscles contract to move blood

  7. What is Blood Pressure? • Define: “[the] pressure that is exerted by the blood upon the walls of the blood vessels” • Blood Pressure is measured by the Systolic Pressure over the Diastolic Pressure. • For example, the average healthy teen or adult has a blood pressure below 120/80 and above 100/65 • Systolic Pressure is the fluid pressure of a contracted blood vessel. • Diastolic Pressure is the fluid pressure of a relaxed blood vessel.

  8. HIGHBLOOD PRESSURE140/90 and above • HighBlood Pressure, orHypertension, is a problem that many people suffer from and do not even know, because it often has no symptoms • HighBlood Pressure can cause: • Heart damage due to the need for the heart to work harder • Tears in blood vessels • Heart attack • Stroke • Kidney Damage

  9. LOWBLOOD PRESSURE90/60 and Below • LowBlood Pressure, orHypotension can cause: • Kidney Failure • Dehydration • Dizziness • Syncope (fainting)

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