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

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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

http://www.starsandseas.com/SAS_Images/SAS_Physiol_Images/SAS%20cardiopics/heart_chambers.jpg

“DUB”

“LUB”

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