1. Circulatory System

2. Functions of the Circulatory System
Transport of oxygen, nutrients and waste products
Helps regulate body temperature

3. Components Heart Blood Blood Vessels
Primary organ that pumps blood through the entire body
Blood
This nutrient rich liquid has everything your cells need to survive
It also collects the waste your cells produce
Blood Vessels
Roads through the body that carry the blood to every single cell
Arteries
Capillaries
Veins

4. Central Organ
The Heart - muscular organ that pumps blood through a network of blood vessels
Myocardium- major muscular portion of the heart
Pericardium- a thick membranous enclosure that protects the heart

5. Heart Anatomy A septum (wall) vertically divides into two sides
Right- pumps blood to the lungs
Left- pumps blood to the other parts of the body
Upper chambers- atrium
Lower chambers- ventricles

6. Flow of Blood in the Heart
Coming from the body,
blood is deoxygenated (low O2, rich in carbon dioxide)
enters the:
1. Superior and Inferior Vena Cava
2. Into the Right atrium
3. To the Right Ventricle
4. Through the Pulmonary arteries
5. To the capillaries of the lungs
to exchange CO2 for O2

7. Flow of Blood in the Heart
6. From the lungs - the blood is rich in O2
7. Through the pulmonary veins
into the Left Atrium
8. To the Left Ventricle
9. Through the Aorta
to the rest of the body

8. Heart Valves
Valves- Flap of tissue that open in only one direction. Valves prevent blood from flowing backwards.

9. Heart Superior Vena Cava Aorta Pulmonary Arteries Pulmonary Veins
Large vein that brings oxygen-poor blood from the upper part of the body to the right atrium
Aorta
Brings oxygen-rich blood from the left ventricle to the rest of the body
Pulmonary Arteries
Bring oxygen-poor blood to the lungs
Pulmonary Veins
Bring oxygen-rich blood from each of the lungs to the left atrium
Left Atrium
Pulmonary Valve
Prevents blood from flowing back into the right ventricle after it has entered the pulmonary artery
Aortic Valve
Prevents blood from flowing back into the left ventricle after it has entered the aorta
Right Atrium
Mitral Valve
Prevents blood from flowing back into the left atrium after it has entered the left ventricle
Tricuspid Valve
Prevents blood from flowing back into the right atrium after it has entered the right ventricle
Left Ventricle
Inferior Vena Cava
Vein that brings oxygen-poor blood from the lower part of the body to the right atrium
Septum
Right Ventricle

10. Blood Blood is 45% cells and 55% plasma Blood Cells: Blood Plasma:
Red Blood Cells: carry oxygen
White Blood Cells: fight disease
Platelets: stop bleeding by scabbing
Blood Plasma:
90% water
10% nutrients and hormones

11. Blood Vessels
Vast network that keep the blood flowing in one direction
Arteries and arterioles- carry blood away from the heart.
Arteries are large, muscular vessels. They are strong and elastic which allow them to stretch as blood enters from the heart.
Arterioles are smaller and less muscular in size and turn into capillaries

12. Blood Vessels
2. Capillaries – tiny blood vessels in networks that allows exchange of material through diffusion, between blood and cells in tissue
Veinuoles- small blood vessels that carry deoxygenated blood away from the capillaries. They turn into veins.
Veins- large blood vessels that carry deoxygenated blood to the heart. Veins have valves which prevents blood from flowing backwards.

13. Two Cardiovascular Pathways
Pulmonary Circulation – blood that travels between the right side of the heart and lungs. Carbon dioxide diffuses out of the capillaries and oxygen diffuses in.
Systemic Circulation – oxygenated blood that travels between the left side of the heart and all parts of the body except the lungs.

14. Blood Vessels
Artery
Vein
Capillary
Blood Pressure is the force the heart puts on your arteries
Healthy is 120/80