Hook: Interesting Facts Science  There are 97,000km of blood vessels in every human  The aorta, which is largest artery located in the body, is about the diameter of a garden hose  The risk of cardiovascular disease is twice as high in women that snore regularly compared to women who do not snore  The right lung of a human is larger than the left one. This is because of the space and placement of the heart  The average life span of a single red blood cell is 120 days

 Canadians eat more Kraft Dinner (Macaroni and Cheese) per capita than any other country in the world  Most lipstick contains fish scales  China has more English speakers than the United States  Vending machines kill more people each year than sharks do  Approximately 75% of human poop is made of water Hook: Interesting Facts

Lesson 3 : The Circulatory System

The Circulatory System  Is composed of three main parts: Heart, blood vessels, and blood.  There are three types of blood vessels: Arteries, Veins, and Capillaries.  A closed system Function  To transport blood, nutrients, waste, and gases (oxygen and carbon dioxide)

Arteries, Veins, & Capillaries  Arteries carry blood away from the heart  Have thick muscular walls (for contraction)  Veins carry blood to the heart  Thin walls  Capillaries bring blood into close contact with tissues in the body (E.g. muscle tissue)  Very thin in diameter

The Human Heart

Blood Movement in the Heart  Deoxygenated blood from the body’s veins enters the right atrium of the heart.  It is then passes a valve and moves into the right ventricle.  From the right ventricle it is pumped to the lungs to receive oxygen and lose carbon dioxide

Blood Movement in the Heart  The oxygen rich blood then flows into the left atrium.  Passing another valve it moves into the left ventricle.  The blood is then pumped to the rest of the body through the aorta and into the arteries.  Oxygen is carried throughout the body.

Summary: Blood Flow in the Heart

Circulatory System Capillaries ( lungs) Capillaries (head, forelimb) Left side of heart Right side of heart Capillaries (hind limbs) Abdominal Organs (Spleen, Stomach, liver)

Review: Blood Flow throughout the Body  Deoxygenated blood from the body enters the right atrium  The deoxygenated blood will then flow from the right ventricle to the lungs  The lungs will exchange the carbon dioxide in the blood for oxygen  The oxygenated blood then enters the left atrium and exits the left ventricle  It then provides oxygen to tissues around the body

Heart Attack  If too much cholesterol is ingested than plaque may build up  When excessive plaque builds up the artery may be clogged.  If the artery is clogged then little oxygen will move to the heart = Heart attack.  If lack of oxygen moves to the brain = Stroke

Blood Flow Summary

What am I? Heart Blood Flow Exercise  Each pair of students will receive a paper with a region of the heart written on it. Task  To describe your region of the heart without giving away its name:  One individual will be responsible for illustrating the region of the heart  The other will be responsible for describing the region of the heart  The class will then have to guess which region of the heart it is