Name Period Date

A1. What is your pulse rate?

. Record your pulse rates for three trials below:

Trial 1 (20-second count) - X 3 = per minute

per minuteTrial 2 (20-secondcount) - X 3 =

Trial 3 (20-secondcount) - X 3 = per minute

. Calculate and record your average pulse rate per minute:

Complete a Data Table:

Use the averagepulse rate for each studentin the class to fill in the data table below.

Class Results: Average Pulse Rates

Pulse rate per minute < 51 51-60 61-70 71-80 81-90 > 90(range of averages)

Number of studentsin this range

Prepare a Histogram:

Histogram Title:

< 51 51-60 61-70 71-80 81-90 > 90

Average Pulse Rate Range

\ ...

Name Period Date

Answer the Following Questions:

Do you see a pattern to the class data? ~-~~~-~ If so, what is it? If not, explain why you think apattern does not exist.

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A question that someone might ask about pulse rate is, "Is there a connection between height and pulserate?" Based on the information obtained from this activity, can you tell if there is a connection

between a person's height and the person's average pulse rate? If so, explain the relation-ship and how you can tell it exists. If not, what additional data would you need to collect to find out ifthere is a connection?

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State another question that someone might ask about pulse rate that could be answered by doing anexperiment.

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Some people have suggested that someone's pulse rate will increase if he or she becomes more active.Try this: Once you have found your resting pulse rate, run in place for one minute. As an alternative,you can dance or do knee bends, jumping jacks, or push-ups.

Did your pulse rate increase? """..,..""' Ask four classmates if they got similar results. Did their pulserates increase after exercise?,

Pulse rates increase for most people after exercise. Explain why this connection between pulse rate andactivity makes sense.

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Name Period Date

A2. How Does Fatigue Affect Muscle Performance?

Record the number of times you could squeeze the clothespin in one minute:

Try the activity again, doing it the same way and using the same two fingers as before.

Record the number of times you could squeeze the clothespin the second time:

Answer the following questions:

Some people are able to squeeze the clothespin more times in a minute than others. Suggest a possibleexplanation for this.

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Could you do as many in a minute the second time as you could do the first time? ~w ww w

Provide a biological explanation for these results.

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Part A. Questions

1. Whatdoes an increased pulse rate indicate about the heart rate and flow of blood in someone'sbody?

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2. When muscles are active, cells use nutrients and oxygen at a higher rate and produce waste

chemicals and heat more rapidly. Describe how the interaction of two or more body systems helps

to maintain homeostasis during periods of high muscle activity. (Be sure to identify the two

systems you refer to in your answer.)

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Name Period Date

3. A student in your class suggests that when most people watch exciting sporting events on television,their pulse rates increase. What is a reliable way to find out if this statement is correct?

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4. What specific evidence would you need in order to determine if what the student suggests in

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5. If you wanted to increase your clothespin-squeezing rate, would you suggest exercising or restingbefore you did it? Explain why you think your choice is the correct one.

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Part B: Investigating Claims

Whjch of the two students do you agree with?claim is correct?

, How could you lfindout for sure which

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Final Laboratory Checklist: Please check that you have completed:

all answers in your Student Laboratory Packet

all answers in your Student Answer Packet

all notes for your Part B experiment

two copies of the final report for your Part B experiment

all written materials for your class presentation

Note: Your teacher must keep on file a copy of the Student Answer Packet for Part A and one copy

of the report for Part B.