Cardiovascular System & the Heart
The Cardiovascular SystemSN p. 125
Links all parts of your body
Consists of heart, blood vessels, and blood
Main functions Delivering needed materials to all cells
Oxygen, foodRemoves waste products from cells
Carbon dioxideFighting Disease – transports cells that attack disease
causing microorganisms
BloodBlood is a complex tissue that is made up of:
Blood VesselsArteries – carry blood rich with oxygen and
nutrients away from the heart
Capillaries – smallest blood vessel with thin walls, exchange of materials between blood and body cells
Veins – carry oxygen-poor cells back to
the heart
Heart ActivitySN p. 125
Click the clothespin together as many times as you can for 2 minutes.
Collect your personal data, both quantitative and qualitative
Trial # Quantitative Qualitative
Trial 1
Trial 2
Trial 3
HeartSN p. 131
Left Atrium
Left Ventricle
Vena Cava
Pulmonary Artery
Right Atrium
Right Ventricle
Aorta
Pulmonary Vein
http://sciencelearn.org.nz/Contexts/See-through-Body/Sci-Media/Animation/Label-the-heart
Two Loop SystemThe heart is at the center of 2 loops
First loop, blood travels from the heart to the lungs and back
Second loop, blood travels throughout the body and back
Heart is 2 pumps – right side pumps blood to lungs, left side pumps blood to the rest of the body
Loop one: To the Lungs and BackBlood entering right atrium is oxygen poor, but rich in
CO2; blood in dark red
Passes through valve into right ventricle
Ventricle pumps blood out into the pulmonary artery to the lungs
Large blood vessels branch into smaller ones to capillaries
Blood cells drop off waste CO2(exhaled) and pick up O2 (inhaled)
Blood leaves lungs oxygen-rich ( bright red) and goes back to the left atrium
Loop Two:To the Body and Back
Left atrium fills with oxygen rich blood
Flows through a valve to left ventricle
Left ventricle pumps blood out of the heart through the aorta
Passes through branching arteries to capillaries, where oxygen is delivered to cells and CO2 is picked up
Blood that is low in oxygen returns to heart through veins to the right atrium