Making Connections State Lab

Front

What system transports materials from the digestive system and respiratory system to the cells?

Back

Circulatory system.

Front

In an investigation to determine the effect of exercise on the rate at which a person can squeeze a clothespin, what is the independent variable?

Back

Exercise.

Front

What causes muscle fatigue during exercise?

Back

Certain waste products collect in the muscle cells.

Front

Why does a person’s heart rate increase during exercise?

Back

During exercise, there is an increase in carbon dioxide, which causes the heart to beat faster.

Front

How can the validity of an experimental result be improved?

Back

By increasing the number of students involved in the experiment.

Front

What is the role of the circulatory system in the body?

Back

To transport oxygen, nutrients, and waste products to and from cells.

Front

Define independent variable in an experiment.

Back

The variable that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What is muscle fatigue?

Back

A temporary inability of muscles to maintain their strength of contraction.

Front

Explain the feedback mechanism related to heart rate during physical activity.

Back

The body increases heart rate to supply more oxygen to muscles and remove carbon dioxide.

Front

What is the importance of increasing sample size in an experiment?

Back

It helps to ensure that the results are statistically significant and reduces the impact of outliers.