Circulatory System PDF

 The Circulatory System Essential Question: What is the structure and function of the circulatory system? Circulation The circulatory system includes the blood, blood vessels, the heart and the lungs. The dissolved food and oxygen needed for respiration are carried around th...

 The Circulatory System Essential Question: What is the structure and function of the circulatory system? Circulation The circulatory system includes the blood, blood vessels, the heart and the lungs. The dissolved food and oxygen needed for respiration are carried around the body by the circulatory system. Which part of the circulatory system actually carries dissolved food and oxygen to the body’s cells? 3 of 7 © Boardworks Ltd 2015 What is the job of the circulatory system? The circulatory system carries blood away from and towards the heart. It is necessary for blood to circulate because it transports oxygen and nutrients around the body. Measuring pulse The heart pumps blood around the body in the blood vessels. Each time it pumps it causes the blood vessels to throb. This is called a pulse. To take your pulse: 1. Hold out one hand with the palm facing up. 2. Put the index and middle fingers of your other hand together. 3. Press these fingers lightly on the underside of the other wrist, just under the thumb bone. 5 of 7 © Boardworks Ltd 2015 Different types of activity What happens to the pulse while someone is running? During exercise, the pulse rises. This causes blood to be pumped around the body more quickly, which increases the amount of oxygen and glucose that can reach muscle cells. What happens to the pulse while someone is sleeping? During sleep, the pulse falls. This causes blood to be pumped around the body more slowly. This means that oxygen and glucose take longer to reach muscle cells. 6 of 7 © Boardworks Ltd 2015 Blood 7 of 7 © Boardworks Ltd 2015 Your beating heart The heart is made of very special muscle called cardiac muscle. This is because it has to keep beating for the whole of a person’s life! If you tried to do the same action repeatedly (like the heart does), your muscles would get tired and, after a while, stop working. For example, if you keep clenching and unclenching your hand, it will get tired and may even start to get cramp. Why is it important for respiration that the heart keeps beating? 8 of 7 © Boardworks Ltd 2015 Ideas about circulation 9 of 7 © Boardworks Ltd 2015 Your heart has 4 chambers. Chambers are like “rooms” inside your heart. Why do the right and left sides of the heart look like they are labeled backwards? When you are looking at the heart the right and left look backwards, but if it was your own heart (flip the perspective) it would be correct.  AORTA PULMONARY ARTERY LEFT ATRIUM RIGHT ATRIUM VALVE LEFT VENTRICLE RIGHT VENTRICLE  How blood flows through your heart: 1. Right atrium 2. Right ventricle 3. Pulmonary Artery (to lungs) 4. Left atrium 5. Left ventricle 6. Aorta (to body) How do we make sure blood only flows in one direction? Blood relies on VALVES to open and close. Valves open to let blood flow forward, and close to make sure blood cannot flow backward. When we listen to our heart beat, we are hearing the valves open and close!  What keeps your heart beating? Your heart has a natural pacemaker that sends an electrical signal to keep it beating. If the signal isn't working, doctors can implant an artificial pacemaker to keep your heart pumping.  What's the difference between veins and arteries? ARTERIES carry blood AWAY from your heart. VEINS carry blood BACK to your heart. You have A LOT of veins and arteries!! If you lined them all up end to end, they would stretch around the Earth 2.5 times!  How long does this whole process take? It takes about 1 minute for blood to circulate from your heart to your body, and back to your heart again.  What is blood pressure? As blood is pushed around the body, it puts pressure against the sides of blood vessels. High blood pressure can lead to heart attacks and stroke. Want to test your blood pressure? Most local pharmacies have a blood pressure machine you can use for free! What is a heart attack? A heart attack happens when a blood clot or blockage cuts blood flow to part of the heart. Heart attacks cause heart muscle to die or become permanently damaged. What causes a heart attack? Eating unhealthy food Smoking Not exercising https://www.youtube.com/watch?v=3_PYnWVo UzM  Helpful Links: https://bogglesworldesl.com/circulatorysystem.ht m https://cfmedicine.nlm.nih.gov/activities/circulator y.html (requires flash) https://www.youtube.com/watch?v=ruM4Xxhx32U https://biologycorner.com/anatomy/circulatory/he art/heart_dissection.html Guided Powerpoint lesson: https://www.youtube.com/watch?v=OeeQuIM92hU