Lesson 14 Terms and Definitions Human Body Systems Lesson 14 Terms and Definitions
Video Watch discovery education Introduction to the circulatory system
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
Q: What does the heart do?
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
Pericardium Pericardium – double walled sac that surrounds, protects, and anchors the heart. http://www.wired.com/images/article/full/2007/09/pericardium_580x.jpg
Chambers? Heart is divided into 4 chambers… Top two chambers = atria (left and right) Bottom two chambers = ventricles (left and right)
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
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).
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.
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
“DUB” “LUB” http://www.starsandseas.com/SAS_Images/SAS_Physiol_Images/SAS%20cardiopics/heart_chambers.jpg
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)
Closed Circulatory System Closed Circulatory System – Blood stays confined within the blood vessels.
Video Discovery Education The heart