The circulatory system
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The Circulatory System. Function. Transport materials O 2 , CO 2 , waste, vitamins, nutrients, H 2 O Regulate body temperature Includes: Blood, arteries, veins, capillaries. Blood. Red Blood Cells Carry oxygen to all cells White Blood Cells Fight infections Plasma

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The Circulatory System

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The Circulatory System


  • Transport materials

    • O2, CO2, waste, vitamins, nutrients, H2O

  • Regulate body temperature

  • Includes: Blood, arteries, veins, capillaries


  • Red Blood Cells

    • Carry oxygen to all cells

  • White Blood Cells

    • Fight infections

  • Plasma

    • Liquid part of blood; mostly water

  • Platelets

    • Help to clot the blood

Red Blood Cells

  • Live 4 months

  • No nucleus

  • Small size

  • Make up approximately 40% of blood volume

  • Carry O2 to the cells of your body

  • Return to the lungs to excrete CO2

White Blood Cell

  • Largest of the three types of cells

  • Responsible for fighting infections or germs

  • Rather short lifecycle, living from a few days to a few weeks

  • One drop of blood can contain 7000 to 25000 white blood cells

  • If an invading infection fights back and persists, that number will significantly increase


  • Is a sticky, pale yellow fluid mixture of water, protein and salts

  • Is 95% water

  • Makes up 55% of human blood

  • Helps maintain BP, carries blood cells, nutrients etc.

  • Can be collected from a normal healthy donor twice weekly


  • assist in blood clotting

  • Smallest of blood cells

  • Make up 5% to 7% of blood volume

  • Form a mesh net to form clots in the Blood to help stop bleeding

Blood Facts

  • Blood makes up about 7% of your body's weight.

  • An average adult has about 14 to 18 pints of Blood.

  • One standard unit or pint of Blood equals about two cups.

  • Blood carries oxygen and nutrients to all of the body.

  • Blood carries carbon dioxide and other waste products back to the lungs, kidneys and liver for disposal.

  • Blood fights against infection and helps heal wounds.

  • One unit of donated whole Blood is separated into components before use (red Blood cells, white Blood cells, plasma, platelets)

  • There are four main Blood types: A, B, AB and O.

To Clot or Not

Blood Vessels

  • Arteries

    • Carry blood AWAY from the heart (usually oxygenated)

    • Walls are thicker to withstand the greater pressure

  • Veins

    • Carry blood TOWARD the heart (usually deoxygenated)

    • Walls are thinner because of lower pressure

    • One way valves

  • Capillaries

    • Tiny, thin-walled blood vessels that allow the exchange of gases, nutrients and waste

    • Some only fit one cell through at a time

Blood Vessels

  • Oxygenated (red)

    • All artieries except 2

    • Pulmonary Arteries carry blood to the lungs

  • Deoxygenated (blue)

    • All veins except 2

    • Pulmonary veins carry blood from the lungs to the heart

Arteries to Veins


Oxygenated blood Deoxygenated blood

Artery vs Vein

Artery vs Vein



  • Structure:

    • 2 atria

      • Receive blood from body and pump to ventricles

      • Thin walled

    • 2 ventricles

      • Pump blood to body tissues

      • Thick, muscular walls

    • Right side pumps deoxygenated blood to the lungs to get oxygenated

    • Left side pumps oxygenated blood to the body

Left side

Right side

Did you know?

  • The only artery in the body that pumps deoxygenated blood is the pulmonary artery.

  • The pulmonary artery pumps blood from the heart to the lungs to be oxygenated!

Heart Anatomy

  • Video: Circulatory System 1

  • Video: Blood Doping

  • Video: Blood Doping3

  • Video: Blood Doping2

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