Transcript Human Body Systems - Athens Academy ~Homepage

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
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