managing materials

The Circulatory System

• circulatory system- transports nutrients and other important resources

  • includes the cardiovascular + lymphatic system

  • brings nutrients and oxygen to cells; removes waste

  • also helps fight disease + infection

• main structure is the heart

  • heart muscle contracts and relaxes constantly

  • blood moves from the heart, to the lungs, and back to the heart

  • blood moving through vessels allows for gas exchange and nutrients to all cells

The Cardiovascular System

• cardiovascular system- pumps blood throughout the body

• the path of blood flow:

  • 1) blood travels from the lungs throughout the body down to the left ventricle

  • 2) takes nutrients and oxygen to the cells of the body, where it picks up waste products

  • 3) the blood returns through the right atrium

  • 4) goes down to the right ventricle, and out to the lungs where gas is exchanged

• we have a double loop system, a continuous pumping of blood

  • in loop 1, blood travels from the heart to the lungs and back again

  • in loop 2, oxygenated blood moves from the heart out to the body and deoxygenated blood is returned to the heart

• red blood cells play a key role in transporting oxygen

  • pick up oxygen in the lungs to bring to cells

  • absorbs carbon dioxide in the body and brings it to the lungs

• blood vessels- connects the heart to the body

  • 1) artery- carries blood away from the heart

  • 2) vein- carries blood back to the heart, and has thinner walls than arteries

  • 3) capillary- tiny; substances are exchanged between blood and vessels