1. Do Now 1.Which is responsible for dropping off carbon dioxide at the lungs – systemic or pulmonary circulation? 2.What is a structural difference between arteries and veins? How does this structural difference affect their function? 3.What are the names of the blood vessels providing blood to the surface of the heart? 4.Why does your heart beat faster when you exercise?

2. Heart Rate Pulse = rate at which your heart beats, beats per minute (BPM) Resting pulse – pulse just after you wake up but before getting out of bed Check your pulse by counting the beats in a set period of time (15 seconds) and multiply by 4 Is there a difference between sitting heart rate and standing heart rate?

3. Create Class Data Table StudentStanding Heart Rate (group 1)Sitting Heart Rate (group 2) Student A Student B Student C Student D Students randomly assigned to group 1 will record their standing heart rate. Students randomly assigned to group 2 will record their sitting heart rate.

4. Is there a difference in heart rate when sitting or standing? Randomly divide class into 2 equal sized groups Half will remain sitting; half will stand Measure pulse for 1 minute Record data What type of statistical experimental design was just used?

5. Analyze the Data Completely randomized design Create a dotplot Calculate the mean pulse rate for each group Is there evidence that there is a difference between standing and sitting pulse rates? Defend your answer with data Pulse Rate Standing HR Sitting HR

6. Is there a difference in heart rate when sitting or standing? Groups will switch (sitting group will stand; standing group will sit) Measure pulse for 1 minute Record data What type of statistical experimental design was just used?

7. Create Class Data Table StudentStanding Heart Rate (group 1) Sitting Heart Rate (group 2) Difference in Heart Rate Student A Student B Student C Student D You will now have 2 numbers per person.

8. Analyze the Data Matched pairs design Calculate the difference in pulse rate (standing – sitting) for each person Create a dotplot of the differences Calculate the mean difference in pulse rate Is there evidence that there is a difference between standing and sitting pulse rates? Defend your answer with data Difference in Pulse Rate

9. Blood pressure is the force of blood against the walls of arteries. Blood pressure is recorded as two numbers—the systolic pressure (as the heart beats) over the diastolic pressure (as the heart relaxes between beats).

10. The average (normal) blood pressure for an adult is 120/80. This number varies by person and it is best if you know what is *normal* for you, so that you (or your doctor) recognize when something is not normal. We will be doing a lab where you will learn to use a this device and check your own blood pressure. SPHYGMOMANOMETER

11. Factors affecting blood pressure: Average is 120/80 (higher number is the systolic pressure) 1. Cardiac Output 2. Blood volume (5 liters for avg adult) 3. Blood Viscosity 4. Peripheral Resistance Cardiac output = stroke volume x heart rate Factors Causing BP to Rise Stress Smoking Cold Temperatures Exercise Caffeine Certain drugs