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5 Cards in this Set
- Front
- Back
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Sino atrial node |
Sino atrial node the sinoatrial Node acts like a natural pacemaker the sand send electronic impulses to the edge dual roles as a result the right and left atria contract at the same time the atrioventricular Node received the impulses from the sun and the avn generating electrical impulses through the right and left ventricles. The impulses cause both you ventricles to contract at the same time from bottom upwards |
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Excercise heart rate |
During exercise, cellular respiration increases and waste carbon dioxide build-up in the body. This makes the blood more acidic and lowers the pH. This is detected by chemoreceptors found in the medulla of the brain and in the aorta. which send more frequent impulses to the intercostal muscle at the ribs and diaphragm, this increases the rate of breathing and depth of breathing. impulses are sent to this and that increase heart rate these actions increase the removal of carbon dioxide from the blood at the lungs and carbon dioxide levels in the blood drop levels of carbon dioxide I could almost constant during exercise |
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What is adrenaline |
The activity of a heart can be increased by adrenaline. Adrenaline Is a hormone which increases the activity of the heart. Adrenaline is released from the adrenal glands, targeting the sinoatrial node, SAN, causing an increase in the strength and speed of heart contractions. This is known as fight or flight response as it prepares the body for sustained exercise. |
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Heart at rest |
60-80 times per minutes Unit is BPM |
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What is a stephoscope ? |
Doctors use a stephoscope to listen to sounds from the heart. The noise made by the repeated slapping shut and opening of the heart valves is called 'lub', caused by the AV valves and 'dub', caused by the seminar valves. |
