Unlike most workers, the heart never gets time off. Each hour, an average heart pumps about 75 gallons of blood throughout your body. Even more difficult, during exercise the heart must work overtime. The heart is the pump that causes your blood to circulate throughout your body and to all of your cells. The heart makes sure that the oxygen you breathe, the nutrients from the food you eat, and the water you drink, is delivered to your body. Without the heart, each of your organs would not be able to function!

When you exercise, you increase the demands for energy and gas exchange. Therefore, your heart must increase the speed at which the blood delivers the vital nutrients. How hard is your heart willing to work? In this investigation, you will examine how much your heart rate will increase and the amount of time it takes for your heart to return to its normal rate.

Part I: Collect Resting Pulse Rate Data

A pulse is the vibrations created each time your heart pumps blood through your arteries. The rate of your pulse indicates the speed of your heart pumping. Find a large tendon on the underside of your wrist. Using your middle and ring finger from your other hand, locate your pulse just below the base of the thumb and on the outside of the large tendon.

1. Find your resting pulse rate before you exercise. Count the beats in your pulse for 30 seconds, then multiply that number by 2 to find the number of beats per minute. Repeat the step two more times and average your results. Record your results in Table 1.

Table 1: Rate of pulse when resting

 

Self

 

Trial 1

 

Trial 2

 

Trial 3

 

Average

Part II: Collect Pulse Rate Data after Exercise

1. Do 50 jumping jacks in a row without stopping. After you stop, immediately take your pulse for 30 seconds. Multiple that number by 2 to get your pulse per minute.

2. Without exercising again, continue to take you pulse for the next ten minutes. This will determine how quickly your heart returns to its resting rate. Record the results after each minute in Table 2

3. Post your results in the D2L course discussion board and collect data from the discussion board from four other students.

Table 2: Rate of pulse after exercise for ten minutes

 

Self

 

Pulse Rate Immediately after Exercise

 

1 minute after

 

2 minutes after

 

3 minutes after

 

4 minutes after

 

5 minutes after

 

6 minutes after

 

7 minutes after

 

8 minutes after

 

9 minutes after

 

10 minutes after

Part III: Share and Collect Data

An important part of science is sharing ad collecting data. Make sure to post your “self” data onto the discussion board in D2L and collect data from two other students. The data on the discussion board from other students will not show up until you post your data.

Enter the data into table 3.

Table 3: Self data and data from two other students

 

Self

Student   1

Student   2

 

Average Resting Pulse Rate

 

Pulse Rate Immediately after Exercise

 

1 minute after

 

2 minutes after

 

3 minutes after

 

4 minutes after

 

5 minutes after

 

6 minutes after

 

7 minutes after

 

8 minutes after

 

9 minutes after

 

10 minutes after

Part IV: Data Analysis & Conclusions

Set up the information from Table 3 onto a graph. You can either:

· create a graph in Word/Excel

· graph using this site: https://nces.ed.gov/nceskids/createAgraph/.

Hints & Tips

1. Write the time variable on the x-axis. This is the independent (manipulated) variable.

2. Write the dependent (what you are measuring) variable on the y-axis.

3. Write the title in the format of dependent variable vs. independent variable.

4. You will place the data for all 3 individuals from Table 2 on the same graph.

Your Graph:

Approximately, how many minutes did it take your heart to return to its normal rate?

Approximately, how many minutes did it take the other students’ hearts to return to their normal rate?

How did your data compare to other students in the course?

What might contribute to the differences in resting heart rate and the time it takes to return to resting heat rate between individuals?

What else, besides exercise, might speed up your heart rate? Give two examples.

Why does your heart rate increase when you exercise? Be specific (hint: think about what needs to be transported to your muscle cells while they are being used).

 

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Introduction
This activity will give you the opportunity to list objects you would include in a Naturalist Center and describe two activities students would complete in this center

The Assignment
1. List all of the objects you would include in a Naturalist Center. Everything that a student needs to complete activities should be in the center. Even writing materials.

2. Based on the objects you included, list two different activities you will have the student complete. Be sure to include materials and step by step directions for each activity.

Grading Criteria
All materials should be listed and appropriate for the center. (40 points) Two activities with step by step instructions should be listed. (40 points) Spelling and Grammar are counted (20 points)

Resources – cite any sources used to complete the assignment

CHAPTERS The World around Us: Naturalist Intelligence

Standard equipment at naturalist centers consists of simple, easy-to-find items. Some possibilities include:	funnels sponges, corks, washers food coloring Recording Materials:
Equipping a Naturalist Center	markers
Collecting Tools:	note cards
paper and plastic cups plastic wrap clear sorting containers tweezers eyedroppers	tape recorder camcorder paper sketch pads Specimens:
Observing and Measuring Equipment:	rocks shells
jeweler loupes magnifying glasses thermometers microscopes binoculars spoon and cup sets scales rulers calculators	seed pods sand dollars twigs preserved insects fibers grains seeds leaves bones feathers
Animal Equipment: cages, boxes, tubs insect cages or jars bird houses aquarium	With a classroom naturalist center established, students can pursue a variety of activities that extend to any discipline. Some samples follow that engage students in the naturalist skills of observing, recognizing patterns, classifying, and experi
Gardening Equipment:	menting.
egg cartons milk cartons cut in half plant pots potting soil garden tools terrarium	Naturalist Center Activities 1. Ask students to place specimens under the microscope or look at them with a jeweler’s loupe. To categorize, recognize patterns, and make analogies and inferences, students
If Desired, Water Table Equipment:	can answer questions such as: What else does this remind me of)
tubes plastic containers sieves	How does this compare with … ? How is this similar to … ? Why is this the way it is?

240

 

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