Question | Answer |
In order to find a hypothesis, one looks for _______________. | Connections. |
Graphs and tables present data in clear and _____________ ways that is easy to understand. | Organized. |
Pulse rate ______________ during exercise because the cells need to be provided with more _____________ and more wastes are produced. | Increased, nutrients. |
Nutrients and wastes are transported to the __________ (oxygen) and the kidneys (urea). | Lungs. |
Muscles become fatigued, due to waste products building up in them. __________ ___________ produces muscle fatigue. | Lactic acid. |
True or False: Organ systems interact in order to maintain homeostasis. | True. |
During the procedure, students found their average _______ ________ after three trials. | Pulse rates. |
Class results were graphed in a connected bar graph called a ___________. | Histogram. |
Pulse rates were found to ____________ after exercising. | Increase. |
True or False: In the procedure, the clothespin was squeezed rapidly for one minute. The number of times it was squeezed was recorded. | True. |
The clothespin was squeezed the same way for another minute. The second time produced a lesser number of squeezes for most people due to _____________ _______________. | Muscle fatigue. |
The ______________ system takes in oxygen, which is transported to the cells with the ______________ system. As cells use oxygen at a higher rate, an increased heart rate would get the oxygen to the cells more _____________. | Respiratory, circulatory, quickly. |
As muscle cells increase their activity, they produce waste products at a higher rate. These wastes are carried to the __________ system by the blood more efficiently when the heart rate increases. | Excretory. |
A reliable way to test a hypothesis or a claim. | Doing an experiment. |
What is necessary in order to have an experiment? | Problem, hypothesis, observations/data, conclusion, materials, procedure, graphs, title. |
The variable that the scientist changes, put on the x-axis. | Independent variable. |
The variable that is affected by the independent variable, the results, y-axis. | Dependent variable. |
True or False: Having more than one independent or dependent variable makes the experiment more valid. | False, there should only be one of each. |
The experimental setup without the independent variable, used to compare the results obtained by the independent variable. | Control. |
Increasing the amount of trials increases the ____________ of the experiment. | Validity. |
It is important to follow the _____________ of your experiment. | Guidelines. |
A conclusion includes a claim that either supports or refutes your ____________ and suggestions for further research and improvement. | Hypothesis. |
The format used for your title. | The effect of _____________ on ____________. |
What is the first step of an experiment? | Determining the question you're trying to answer. |
What activity in the lab demonstrated muscle fatigue? | Repeatedly squeezing a clothespin. |
What was graphed in the histogram? | The number of students in each average pulse rate. |
In order to prove two things have a connection, one should preform an _______________. | Experiment. |
Having a lower number the second round of squeezing a clothespin shows that.... | Muscle cells become fatigued as waste products build up inside of them. |
Why does someone's pulse rate increase after exercise? | Muscles need extra oxygen and food to replace what was used up. |
The amount of times the clothespin was squeezed was the ____________ variable. | Dependent. |
A tentative statement about the expected relationship. | Hypothesis. |
True or False: In this experiment, it was important that students took part in the same level of physical intensity. | True. |
What should you know before starting the experiment? | Safety precautions, references to prior experiments. |
True or False: The same person rarely has the same resting pulse rate at different times of the day. | True. |
True or False: An incorrect hypothesis does not have significant value. | False, it has much value. |
Peer review. | The sharing of information using scientific journals, presentation, or the internet. |