The Circulatory System Start by asking the students what they know about the circulatory system

Read each of the following pages Read each of the following pages. Take turns reading until everyone in your group has had a chance to read.

Interesting Facts about the Circulatory System…. The heart muscles will stop working only when we die. The human heart continues to beat even after it is taken out  of the body or cut in to pieces. (for a short time!) An adult human body contains five to six liters of blood and an infant  has about one liter of blood. Except the heart and lungs, all the other parts of the body receive their blood supply from the largest artery of the body, the aorta. Facts on the circulatory system

The Pulmonary vein is the only vein in the human body that carries blood with oxygen while all the other veins of the body carries blood with carbon dioxide. Human blood is colorless. It is the hemoglobin; a pigment present in the red blood cells that is responsible for the red color of the blood. Heartbeat is the sound produced by the closing of valves in the heart when the blood is pushed through its chamber. A women's heart beat is faster than that of a man's.

What is the circulatory system What's included in the circulatory system? Heart Arteries Veins Capillaries Overview of the main parts of the circulatory system Can discuss the functions of each at this stage: Heart – pumps blood around the body Arteries carries blood to the body organs and tissues Capillaries – the blood vessels where oxygen and carbon dioxide are exchanged between the blood and the body parts Veins – carry blood back to the heart

The Heart How big is the heart? Discuss Where is the heart? Discuss The Heart is a big lump of muscle Introduce the heart as a muscle Identify where it is on the body How big is the heart? Discuss Where is the heart? Discuss

The heart has 4 chambers: Explanation of Heart Left Atrium Right Atrium What kind of blood does each side pump? Which side of the heart is thicker Right Ventricle Left Ventricle Valves Overview of the main chambers of the heart The left side is the thicker side because it has to pump blood all around the body The left side pumps blood that has oxygen in it to the body The right side pumps blood that has carbon dioxide in it to the lungs. The heart pumps by squeezing it’s walls which are thick muscles. The heart has 4 chambers: 2 on the Right: received blood and 2 on the left: pumps the blood out How does the heart pump?

Stethoscopes Use the stethoscopes to listen to each other’s heartbeat. Students to use stethoscopes to listen to their heart beats Use the stethoscopes to listen to each other’s heartbeat.

Real Heart Get some real sheep’s hearts from the butcher for the students to examine. Give them 2 hearts per group: One cut in half to see the inside chambers and one left intact to see the overall size and muscularity of the heart.

How Hard Does our Heart Work? Squeeze and release the object without slowing down for the next minute! Did it get harder as your time went on? Your heart beats (squeezes)like this many, many times a day. Do you think your heart would be in good shape? To mimic how hard the heart works, have the students squeeze a tennis ball for 1 minute. It takes a lot of effort to do it for 1 minute. Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

Circulation Red = Artery Blue = Vein Artery carries fresh blood around the body. Blood passes capillaries and oxygen and nutrients are taken up by our organs. Deoxygenated blood is returned back into the heart. Heart pumps this blood back to the lungs to collect more oxygen. Explanation of the flow of blood around the body. Students can role play the flow using discs for oxygen and carbon dioxide to carry around in the blood.

How much Blood does Your Heart Pump? Your body has about 5.6 litres of blood. This 5.6 litres of blood circulates through the body three times every minute. In one day, the blood travels a total of 19,000 km -- that's four times the distance across the US from coast to coast. The heart pumps about 1 million barrels of blood during an average lifetime--that's enough to fill more than 3 super tankers. The heart pumps around a third of a cup each time it beats. Can use buckets and empty milk bottles to show these amounts of liquid.

Why is blood pumped around the body? Carry red blood cell around: so our body can use oxygen. (why is oxygen needed?) Carry white blood cells around body: white blood cells act as soldiers to protect us. Explains two main roles of the blood: Oxygen to the cells for energy To help with immunity through white blood cells

Feeling your Blood Move... Do the following activity Take a piece of paper and record your results in a chart. Find your pulse on your wrist or just under your jaw bone on the side of your neck Take your pulse (count how many beats in one minute) Walk for 30 seconds Take your pulse Jumping Jacks for 30 seconds Rest for 30 seconds The pulse you feel is blood stopping and starting as it moves through your arteries. Your resting pulse might range from 90 to 120 beats per minute (bpm). As an adult, your pulse rate slows to an average of 72 beats per minute. Students take their pulse and see how it changes during exercise. Students can graph their resting, exercise and recovery heart rates Using the information in your chart…make a line graph to show your results of your pulse before and after exercising.

Exercise and your Heart When exercising your body needs carbohydrates. These carbohydrates need to mix with oxygen before they can create energy. The heart is needed to supply oxygen to body – like to muscles where the energy is needed. Recap on how the body gets energy and the role of food and the heart.

When you are finished: go to the next laptop and watch the movie about the heart and respiration.