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Name: _______________________ 1 Homeroom: ________ Blood Pressure Lab Question: Does exercise affect my blood pressure? Background: Your heart is a pump. As it contracts, it pushes blood through your arteries. When blood is pumped out of the heart it is forced out under pressure. You can feel this wave of blood when you check your pulse. Your pulse tells you how fast your heart is beating. It is also an indication of how hard your heart is working. In order for blood to reach your hands and feet, it must be pumped out of the heart under great pressure. You can measure that pressure using a blood pressure cuff or sphygmomanometer. When you give a blood pressure reading, you use two numbers, such as 120 over 80. The two numbers show the blood pressure at two different stages of your heart’s pumping cycle: Systolic pressure – when the heart pumps, blood pressure rises sharply. High blood pressure reading. Diastolic pressure – when the heart is relaxed and blood pressure is at it’s lowest. Science 8 Hypothesis: If_________________________________________________________________________________ ____________________________________then__________________________________________ ___________________________________________________________________________________ Safety: List 2 safety rules for this lab: 1. 2. Variables: Manipulated Variable: Responding Variable: Control Variables: Materials: Blood pressure cuff Partner Stairs or hallway Procedure: 1. Watch the demo done by your teacher on how to use a blood pressure cuff. Science 8 Name: _______________________ 3 Homeroom: ________ 2. Measure your blood pressure while resting at your desk, record it and your pulse in your chart. 3. Do five minutes of exercise (running on the spot, push ups, walk the stairs, etc). Measure your blood pressure and record it in your chart. 4. Rest for five minutes then record your blood pressure. Record this in your chart. 5. Repeat with your partners. Each person should have their partners data in their chart. Observations: Partner 1: Blood pressure BP Partner 2: Pulse BP Partner 3: Pulse BP Average: Pulse BP At rest before exercise Right after 5 min. exercise At rest 5 min. after exercise Conclusion: 1. How did exercise affect your heart rate (pulse) and blood pressure? Science 8 Pulse 2. What happened to your heart rate and blood pressure when you rested for 5 minutes after exercise? 3. Looking at the table on page 1, did your blood pressure fall into the normal category? 4. Regular exercise increases circulation and increases the health of the heart. As a result, the heart muscle works more efficiently. Predict how regular exercise would affect blood pressure. Science 8