Need help with Experiment Lots of points!

Step 1: Lie down in a comfortable position for 3-5 minutes. After the time has elapsed, count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. To find your pulse, place your index and middle fingers under your jawline on either side of your larynx. Do not use your thumb. Record your heart rate.

Step 2: Sit in a chair for 3-4 minutes, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Step 3: Stand for 3-4 minutes, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Step 4: Run in place for 60 seconds, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Step 5: Do jumping jacks in place for 60 seconds, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Step 6: Sit in a chair for 60 seconds, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Step 7: Lie down for 60 seconds, then count the number of times your heart beats in 6 seconds. Multiply times ten to get the number of beats per minute. Record your heart rate.

Answer the following questions.

1) According to your data, what kind of activities increased your heart rate?

2) According to what you have learned about the circulatory and respiratory systems, explain how and why your heart changed its rate.

The activities that increased my heart rate were running and jumping, which in turn decreased once I was able to sit down and/or go to bed.
When physical activity is performed, the muscles require more oxygen and expel carbon dioxide generated in the activity, so the lungs perform the process of inhalation and exhalation more quickly in order to obtain a greater amount of oxygen of the air breathed (remember that not all the air is oxygen, it is about 78%) and in turn, the heart pumps faster in order to transport oxygen more quickly to the muscles that need it, which is why it increases heart rate.

Explanation:

Our circulatory and respiratory systems work synergistically with the rest of the body's systems and organs, satisfying the needs of the organs that require it, as in this example, the muscles that need to obtain oxygen and eliminate the carbon dioxide generated during the activity. physical, which is achieved through the increase in breathing and breathing rate.

mkim6926 mkim6926 · Answer 2 · 2021-07-30T00:46:33+02:00

Answer:

Lab: Heart Rate

Part A: Identifying Variables

The dependent variable happens as a result of values/changes associated with the independent variable.

Independent variable: number of cigarettes smoked

Dependent variable: risk for lung cancer

Independent variable: number of sharks swimming in a coastal region

Dependent variable: number of shark attacks on humans

Independent variable: amount of milk a person drinks

Dependent variable: the strength of his or her bones

Part B: Heart Rate

Hypothesis: If I hold my breath for 30 seconds, then my heart rate will

(choose 1) increase/decrease.

Independent variable: holding my breath

Dependent variable: heart rate

Part C:

The heart rate decreases because oxygen exchange in the lungs decreases.

This depends on what you chose for heart rate in the hypothesis. If you said the heart rate decreases after holding your breath, and the results showed the heart rate decreased, then the hypothesis is supported. If you said the heart rate decreases after holding your breath, and the results showed the heart rate increased, then you refuted the hypothesis.

Heart rate can change due to an increase or decrease in activity, moving positions such as sitting and standing, and emotions.

Example: Increase in activity—jumping jacks

Hypothesis: If I do five jumping jacks, then my heart rate will increase.

Test hypothesis. You can use the average resting heart rate from the previous experiment. If you do an experiment with an increase in physical activity like jumping jacks, then your data will reflect an increase in heart rate because the body requires more energy, which requires more oxygen, increasing the overall flow of blood in the body.

Support or refute the hypothesis based on the results. The hypothesis is supported if it aligns with the observed results. The hypothesis is refuted if the results don’t match the statement based on the variables.

Testing more than one variable at a time makes it difficult to interpret the results and support or refute the hypothesis. With one variable, the results can be associated with changes to that variable. To get the most reliable data to support or refute a hypothesis, an experiment should be completed several times to see if the results show the same trends.

Explanation: Penn Foster