Q General Guidance: You should read through this week's assigned lab and/or Peerceptiv material before you make your post, so that your post will be informed, and you avoid posing a question that is answered in the course materials. General Format: You are required to make ONE post to each week’s lab discussion board. Your required post must contain 50 words at minimum and be written in your own words. Your grade will be determined by your demonstration of three areas of communication: application, critical thinking, and writing. Deadline: Your required post is due by 11:59PM, Wednesday. Late posts will be penalized 0.5 points (20%) per day late. NOTE: We recommend that you avoid using the smartphone/tablet Canvas app when submitting your discussion post, because the app frequently fails to associate posts with your corresponding discussion group. ________________________________________ This Week's Posting Prompt: Address at least ONE of the following prompts, pose a related question, or respond to a classmate's post. For this week's lab activity, you will be taking blood pressure and heart rate in different body positions. You will also be analyzing a data set that we collected from students in a previous term. The figures for the class data set are below. 1. What is your hypothesis for what is happening to heart rate and blood pressure when students shift from a supine (lying on back) to standing position? To answer this question, you will have to read the lab handout which states the conditions under which blood pressure and heart rate were measured, and you must also consider the blood pressure homeostasis and blood flow equations: MAP = CO x TPR, and CO = SV x HR, respectively. 2. What is the potential cost to an animal if blood pressure is allowed to either drop precipitously or increase dramatically? 3. When you analyze the class data set, you will be using a paired t-test. What is the advantage to using a paired test, when measuring before and after data from the same individuals? 4. Explain why blood pressure is reported as one number over another? Why is one number always larger than the other? 5. What is the formula for mean arterial pressure (MAP)? Why isn't MAP simply the average of systolic and diastolic pressure? 6. What makes the sounds you hear when listening to a heart beat? 7. Giraffes have large hearts, which produce tremendous systolic pressure in order to move blood against gravity up their long necks to their heads and maintain sufficient blood pressure in the vessels in their brains. When they bend over to drink, this constraint is removed. Why don't giraffes give themselves a stroke whenever they lower their heads for a drink? (It's a serious question.)