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