Why do people feel faint if they stand up too fast?

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Presentation transcript:

Why do people feel faint if they stand up too fast? ATB Why do people feel faint if they stand up too fast?

Circulatory System Components: heart, blood vessels, lungs Functions: Transports nutrients, gases (carbon dioxide and O2), waste, water, hormones Distributes heat Maintains homeostasis: maintains correct amounts of nutrients, gases, and wastes and correct temperature.

Arteries vs. Veins - Arteries carry oxygenated blood from the heart to the body - Veins carry blood towards the heart for purification.

Blood Pressure Blood pressure is the pressure exerted by circulating blood on the walls of blood vessels

Heart Structure

1. aorta

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs)

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava 9. left pulmonary artery (to lungs) 10. left pulmonary veins (from lungs)

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava 9. left pulmonary artery (to lungs) 10. left pulmonary veins (from lungs) 11. left atrium

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava 9. left pulmonary artery (to lungs) 10. left pulmonary veins (from lungs) 11. left atrium 12. left atrioventricular valve 13. aortic valve

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava 9. left pulmonary artery (to lungs) 10. left pulmonary veins (from lungs) 11. left atrium 12. left atrioventricular valve 13. aortic valve 14. left ventricle

1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4 1. aorta 2. superior vena cava 3. right pulmonary artery (to lungs) 4. right pulmonary veins (from lungs) 5. right atrium 6. right atrioventricular valve 7. right ventricle 8. inferior vena cava 9. left pulmonary artery (to lungs) 10. left pulmonary veins (from lungs) 11. left atrium 12. left atrioventricular valve 13. aortic valve 14. left ventricle 15. abdominal aorta

Blood Flow in the Heart 9. left pulmonary artery (to the lungs) 3. right pulmonary artery (to the lungs) 10. left pulmonary veins (from the lungs) 4. right pulmonary veins (from the lungs) 8. inferior vena cava (from the body) 15. abdominal aorta (to the body)

Heart Rate Lab Objectives Calculate your heart rate while laying, sitting, standing, and after exercise. Compare your resting (sitting) heart rate with the class average.

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