Making Connections TK

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.

Muscle fatigue occurs during this activity when

• carbon dioxide is used up in the muscle cells

• simple sugar is converted to starch in the muscle cells

• proteins accumulate in mitochondria in the muscle cells

• certain waste products collect in the muscle cells

If a control group is not included in an experiment, it would be difficult to

• formulate a hypothesis for the experiment

• make observations about the experimental group

• record data in a data table

• draw a valid conclusion

How do the circulatory and excretory systems work together?

• The circulatory system brings nutrients and oxygen so our cells can produce energy.

• The circulatory system brings blood to the kidneys to filter and remove waste.

• The circulatory system bring white blood cells around the body to fight infection and disease.

• The circulatory system helps the excretory system digest food.

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 (choose 2)

• increasing the number of students

• using safety precautions

• using a plastic clothespin

• making a bar graph of the data

  
  

• repeating the experiment

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

• circulatory
• respiratory
• digestive
• skeletal

What is the function of the circulatory system?

• Transport oxygen and nutrients

• Remove extra water and wastes

• Digest food and absorb nutrients

• Collect, transfer and process information

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 oxygen and build up of waste in the muscles

• lack of carbon dioxide in the muscles

Which body system gets oxygen from the environment and removes carbon dioxide and other wastes from the body?

• Circulatory
• Respiratory
• Digestive
• Excretory

Brad’s swim times in seconds are

80, 85, 90, 85, and 90.

What is the average of

Brad’s swim times?

• 85 seconds

• 86 seconds

• 90 seconds

• 92 seconds