Who wrote the book of love? An introduction to your cardiovascular system

Functions of the CV System Carries needed substances to cells Carries waste products away from cells

What does the CV system transport? Carried by blood Oxygen from lungs to body cells Sugar to cells to produce energy Waste Products Picks up CO2 waste from cells Carries to the lungs to be exhaled Disease Fighters Transports cells that attack disease-causing microorganisms

The Heart A hollow, muscular organ that pumps blood throughout the body About the size of your fist, center of chest When the heart beats, blood is pushed through blood vessels

The Heart’s Structure Atrium: Upper Chamber Ventricle: Lower Chamber Receives blood that comes into the heart Ventricle: Lower Chamber Pumps blood out of heart Valves: Flaps of tissue that prevent blood from flowing backward.

How the Heart Works 2 phases Relaxed: when heart relaxes it fills with blood. Contracts: when heart contracts if pumps blood forward

Vessels After leaving the heart, blood travels in vessels through the body. 3 kinds of vessels Arteries: blood carried away from heart. Capillaries: tiny vessels where substances are exchanged between blood and body cells. Veins: carry blood back to the heart.

Where Does the Blood Go? 2 loops Loop One: Loop Two: To the lungs and back to the heart Loop Two: To the body and back to the heart

The Blood’s Winding Road The average human has about 60,000 miles of blood vessels in their body.

Blood Made up of 4 components Plasma Red Blood Cells White Blood Cells Platelets

Plasma Carries molecules that come from the break-down of digested food. About 10% of plasma Water About 90% of plasma

Red Blood Cells Produced in bone marrow Take up oxygen in the lungs and deliver it to cells in the body. Made of mostly hemoglobin Oxygen carrier

White Blood Cells Produced in bone marrow The body’s disease fighters WBC’s fewer in number than RBC’s

Platelets Cell fragments that play an important part in forming blood clots. Heal wounds Helps prevent infection and loss of blood.

Blood Types Four different types: A, B, AB, and O Type determined by markers on the RBC’s Universal Donor: Type O Universal Receiver: Type AB

Cardiovascular Health CV Disease Atherosclerosis: artery wall thickens May lead to heart attack Heart Attack: when blood flow to part of the heart is blocked.

Hypertension High blood pressure Can damage heart and arteries

Staying Healthy Regular exercise Balance Diet Avoid Smoking