Regulation of Human Heart Rate Lab IntroDirections Introduction

Regulation of Human Heart Rate Lab Intro/Directions

Introduction 1. Why do you need to have a heart? Why do you need to have blood circulate to all parts of your body?

Answers 1. You need a heart to pump blood. 2. You need blood to circulate to all the parts of your body in order for oxygen to get to all body cells (gas exchange) Oxygen/ Carbon Dioxide exchange

Introduction How does your heart pump blood? What is a heart beat?

Answers The left and right ventricles pump blood to your body: ie cardiac muscle The heart beat is the sound of two valves opening/closing in the heart. >>>>. LUB DUB

Does your heart always beat at the same rate?

Answer: NO

List some activities or stimuli that you think may increase a person’s heart rate.

Answers Lots of possible answers Exercise; nervousness; etc.

Why would it be useful for the heart to beat faster during these activities or in response to these stimuli?

Answer: You need blood to move faster! So heart needs to pump faster in order for the blood to deliver oxygen/glucose and pick up carbon dioxide.

Are there any activities or stimuli that you think may decrease a person’s heart rate?

Answers Relaxing exercises Yoga Massage Acupucture Reflection

Measuring Heart Rate Accurately Steps to follow (use your lab sheet) 1. Measure pulse rate for 30 seconds 2. Multiply number by two

GROUPS OF 4 student jobs SUBJECT (person we is getting pulse rate measured) Measure pulse on left arm Measure pulse on right arm Use stop watch to time a 30 second interval * if you have three people…one person must have two jobs!

Accuracy IF both people in group did not get same reading do it again until pulse rate is accurate.

Designing your Experiment Discuss with group ideas concerning activities or stimuli which may increase or decrease heart rate. Choose a hypothesis that your group would like to test Raise your hand when finished so I can check it!

Plan your experimental procedure Must be numerical…. . 1, 2, 3 etc

Test your hypothesis

conclusion 1. Restate your Hypothesis 2. Do you accept or reject your hypothesis? 3. What was your average pulse rate? (activity or stimuli) 4. Explain why the subject’s heart rate increased while they were performing the activity. Be specific 5. IF we were to do this again, what would you change? (procedures)