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Understanding the Circulatory System: Functions, Heart Structure, and Blood Circulation

This informative video lesson explores the circulatory system’s purpose, focusing on how it transports nutrients, oxygen, and carbon dioxide throughout the body. Learn about the heart, the main organ of this system, its vital role as a pump, and its robust muscular structure. Discover the significance of the pericardium, heart chambers, and the sinoatrial node (the heart's pacemaker). Understand the two circulatory paths: pulmonary and systemic circulation, as well as the sounds of the heartbeat. Join us for a comprehensive overview of human cardiovascular physiology.

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Understanding the Circulatory System: Functions, Heart Structure, and Blood Circulation

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Presentation Transcript

  1. Human Body Systems Lesson 14 Terms and Definitions

  2. Video • Watch discovery education • Introduction to the circulatory system

  3. The Circulatory System Purpose – transport nutrients, oxygen, CO2, water, and other materials throughout the body. http://www.wv-hsta.org/summer_2003/biomed/teachers/exercise_physiology/exercise_physiology/images/circulatory_system.gif

  4. Q: What does the heart do?

  5. Heart • Main organ of the circulatory system • Located between the lungs • Heart is a pump • One of the strongest Muscles in the body http://www.mynews.in/News/dailyimage/news/Heart--300--1.png

  6. Pericardium • Pericardium – double walled sac that surrounds, protects, and anchors the heart. http://www.wired.com/images/article/full/2007/09/pericardium_580x.jpg

  7. Chambers? • Heart is divided into 4 chambers… • Top two chambers = atria (left and right) • Bottom two chambers = ventricles (left and right)

  8. chambers NOTE: Your right and left NOT the left and right on the paper!!! http://www.starsandseas.com/SAS_Images/SAS_Physiol_Images/SAS%20cardiopics/heart_chambers.jpg

  9. Sinoatrial Node • Also known as the S-A Node • Pacemaker of the heart • Responsible for the maintaining the beat and rhythm of the heart. • Avg. resting adult 70 beats per minute (BPM).

  10. Pumps of the heart… • Two pumps (right and left). • Pulmonary circulation (right side) – receives blood from the body and circulates it to the lungs. • Systemic circulation (left side) – receives blood from the lungs and circulates it to the rest of the body.

  11. The sound of a heart beat… • “LUB-DUB” – a two part beat. • “LUB” = the closing of the valves between the atria and ventricles • “DUB” = the closing of the valves between the ventricles and the outgoing arteries

  12. “DUB” “LUB” http://www.starsandseas.com/SAS_Images/SAS_Physiol_Images/SAS%20cardiopics/heart_chambers.jpg

  13. Blood Colors • Bright RED – Oxygen Rich (leaving the lungs headed to the cells) • Blue – Carbon Dioxide Rich (leaving the cells headed back to the lungs)

  14. Closed Circulatory System • Closed Circulatory System – Blood stays confined within the blood vessels.

  15. Video • Discovery Education • The heart

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