1. Lesson 14 Terms and Definitions
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.

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

6. Pericardium
Pericardium – double walled sac that surrounds, protects, and anchors the heart.

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!!!

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”

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.

16. Video
Discovery Education
The heart