Making Connections

An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.

In this investigation, the independent variable is the

• control

• exercise

• rate of squeezing

• number of participants

An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.

The experimental results could be made more valid by

• increasing the number of students

• using safety precautions

• using a plastic clothespin

• making a bar graph of the data

  
  

An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.

The dependent variable for this experiment is the

• time the student was squeezing the clothespin

• number of times the student was able to squeeze the clothespin

• strength of the student

• length of the clothespin

Tags

NGSS.MS-PS2-2

An experiment was conducted to determine the effect of activity on pulse rate. Data were collected and recorded in the table shown.

Which activity most likely corresponds to the pulse rate of the person while sleeping?

• 1

• 2

• 3

• 4

A class is recording pulse rates of the students in a data table like the one shown.

One student checks his pulse and counts 23 beats over a time interval of 20 seconds. In which row in the data table should the pulse rate of this student be recorded?

• A

• B

• C

• D

What was the student’s resting pulse rate in beats per minute?

• 160 beats/min

• 100 beats/min

• 80 beats/min

• 69 beats/min

The graph shows the average heart rate data for a group of students before, during, and after exercise. State one benefit of the increase in average heart rate during exercise.

In the lab activity Making Connections, an experiment was designed to test the effect of exercise on the ability to squeeze a clothespin. The number of times the clothespin was squeezed served as the

• independent variable

• dependent variable

• hypothesis

• control

During periods of vigorous physical activity, a person's breathing and heart rates increase. This enables the cells of the body to perform more efficiently because it helps the cells to

• remove waste products faster

• store excess glucose in muscles

• reduce the amount of ATP produced

• convert more oxygen to glucose

Tags

NGSS.MS-LS1-3

NGSS.MS-LS1-7

Accoding to the Data Table, at what hour was the persons heart rate the lowest.

• 1

• 4

• 5

• 7