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Heart Web Quest PE 12 Mr. Lang

Heart Web Quest PE 12 Mr. Lang. Grade 12 PE Mr. Lang Heart Assignment. Identify the chambers of the heart, valves, aorta, pulmonary artery, pulmonary vein, superior and inferior vena cava on the diagram included .

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Heart Web Quest PE 12 Mr. Lang

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  1. Heart Web Quest PE 12Mr. Lang

  2. Grade 12 PE Mr. Lang Heart Assignment • Identify the chambers of the heart, valves, aorta, pulmonary artery, pulmonary vein, superior and inferior vena cava on the diagram included.

  3. . Describe the flow of blood as it returns to the heart and the sequence it follows until it is pumped out of the heart. • Blood returns to heart from the superior and inferior vena cava • and enters the right atrium • Blood passes through the tricuspid valve • Into the right ventricle • Then through the pulmonary valve to the lungs • Returns from lungs through the mitral valve into • The left ventricle and then passes • Through the aortic valve into • Right atrium and then into the aorta and • Out through the arteries to the body

  4. What makes the “lubb – dubb” sound of our heart beat? What happens to the blood during the lubb beat? What happens to the blood during the dub beat? • When the tricuspid and aortic valves shut they make the lubb sound • When the pulmonary and mitral valves shut they make the dubb sound

  5. The electrical system of the heart controls the speed and rhythm of the beating. Why does the heart need to speed up during activity or physical effort? • During exercise the muscles require more oxygen to create energy used in contractions • The heart responds by beating faster and pushing blood at an increased rate to the body cells in need.

  6. What part is referred to as the heart’s natural pacemaker and what role does it perform? • The SA (Sino Atrial) node regulates the pace and rhythm of the heart. It can increase it as needed in exercise or fright and flight or decrease it during resting as needed. • The SA node receives signals from our brain which then trigger electrical impusles from the node to the atria, causing them to contract.

  7. What part is referred to as the heart’s electrical bridge and what role does it perform? • The AV (atrial ventricular) node is known as the electrical bridge. It acts as a switch causing the impulse to pause before causing the ventricles to contract. • Once the Atria have finished their contraction the AV node signals the Ventricles to contract. • This is known as sinus rhythm and allows the blood to push in one direction through the heart.

  8. What is the HIS Perkinje System and what role does it perform? • The HIS Perkinje System are the nerves bundles on the ventricles that transmit the electrical signal from the AV node. • They cause the ventricles to contract.

  9. An Electro Cardio Gram (ECG) is shown as an electrical wave when the heart beats. Doctors use it to determine if the heart is beating normally. Damaged hearts produce irregular waves. A normal wave is shown for the heart on the website. Find out what the P wave, QRS wave and the T wave represent on the ECG during a single heart beat. • P Wave occurs when the Atria contract • QRS Wave occurs when the Ventricles contract • T Wave occurs when the relax

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