Quizizz #13 (1920)

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 a laboratory activity, students ran in place for three minutes. Students then complained of muscle fatigue in their legs. 3 biological reasons why the students experienced muscle fatigue after exercising.

• Wastes built up in muscles/muscle cells.

• Not enough oxygen was available to muscle cells.

• Anaerobic respiration occurred.

• The circulatory system delivered enough oxygen to muscle cells

A student is opening and closing clothespins as part of a lab activity. The student begins to experience muscle fatigue, and the rate at which the student is opening and closing the clothespins slows. Which graph best represents the relationship between time and number of clothespin squeezes?

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• 
• 
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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

• store excess glucose in muscles

• reduce the amount of ATP produced

• remove waste products faster

• convert more oxygen to glucose

A person's pulse rate generally goes down while sleeping. One reason for this decrease is

• the body is producing more carbon dioxide when a person is sleeping

• a person is not using energy while sleeping

• a person requires less oxygen when sleeping

• the body is using more nutrients while asleep

The students want to improve the validity of a conclusion. The best way to accomplish this is to

• change the hypothesis

• repeat the investigation several times

• increase the number of variables

A student lifted weights after school and found that his muscles started to burn. He couldn't continue to lift the weights after prolonged exercising. This muscle fatigue is most likely due to

• the heart beating too fast and tiring out

• the lungs accumulating oxygen

• lack of carbon dioxide in the muscles

• lack of oxygen and build up of waste in the muscles

What is one reason why individuals in this group have different pulse rates before exercise? 

• They have equal fitness levels

• They have different fitness levels

• They are all the same sex

• They are all the same age

Calculate the average for the table shown

• 19

• 18

• 17

• 16

Calculate the 1 minute pulse rate for trial number 2

• 74

• 73

• 72

• 71