Living things review

The buildup of waste products in muscle cells that are active might cause

• Digestion

• Increased fatigue

• Cellular respiration

• Decreased heart rate

Which two body systems work together to remove wastes produced by exercising from cells?

• Immune and Endocrine

• Digestive and Skeletal

• Respiratory and Circulatory

• Circulatory and Digestive

In order for muscle fatigue to end, the muscle cells must be provided with

• Oxygen

• Carbon Dioxide

• Nitrogen

• Amino Acids

During the lab we experimented to see if resting or warming up increased the number of times we could squeeze a clothespin. In our experiment, the number of times a clothespin can be squeezed is the

• Independent Variable

• Dependent Variable

• Hypothesis

• Control

What body system are you measuring the activity of when you are measuring your pulse rate?

• digestive

• circulatory

• respiratory

• excretory

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

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 the activity described when

• certain waste products collect in the muscle cells

• simple sugar is converted to starch in the muscle cells

• carbon dioxide is used up in the muscle cells

• proteins accumulate in mitochondria in the muscle cells

One student checks his pulse and counts 21 beats over a time interval of 20 seconds. What would be his pulse rate?

• 21

• 21 beats per minute

• 63 beats per minute

• any of these could be used

A ___________________ is an organic molecule used as the body's primary source of energy.

• protein

• nucleic acid

• carbohydrate

• lipid

Which biomolecule builds muscle tissue?

• protein

• nucleic acid

• carbohydrate

• lipid