When a person does strenuous exercise, small blood vessels (capillaries) near the surface of the skin increase in diameter. This change allows the body to be cooled. These statements best illustrate

• synthesis

• homeostasis

• excretion

• locomotion

Which situation is not an example of the maintenance of a dynamic equilibrium in an organism?

• Guard cells contribute to the regulation of water content in a geranium plant.

• Water passes into an animal cell causing it to swell.

• The release of insulin lowers the blood sugar level in a human after eating a big meal.

• A runner perspires while running a race on a hot summer day.

Some people with spinal cord injuries do not sweat below the area of the injury. Without the ability to sweat, the human body temperature begins to rise. Which statement would best describe this situation?

• Feedback mechanisms regulate blood sugar levels.

• Gene mutations are increased.

• Energy from ATP is not available.

• Dynamic equilibrium is disrupted.

Activities in the human body are represented in the diagram. Which title would be appropriate for the diagram?

• Rate of Excretion Varies in Response to Amount of Water Taken In

• Feedback Mechanisms Help to Maintain Homeostasis

• Respiratory Rate Responds to an Increase in Muscle Activity

• The Nervous System Responds to Changes in Blood Sugar Levels

Sweating is a process that helps cool the body during strenuous exercise. This is an example of

• recycling of gases

• cellular respiration

• gene malfunction

• a feedback mechanism

The diagram below represents an activity that occurs in the human body. This diagram best illustrates

• active transport

• maintenance of homeostasis

• synthesis of nutrients

• differentiation

Bumblebees show some ability to control their own body temperature. During cold weather, bumblebees have been observed warming their flight muscles by shivering. The bees are able to maintain a body temperature several degrees above that of the surrounding air. Regulation of their internal body temperature is an example of

• diffusion

• synthesis

• respiration

• homeostasis

A person usually experiences small variations in body temperature over a 24-hour period. These variations in temperature are an example of

• an immune response

• genetic differences between individuals

• an adaptation to global warming

• dynamic equilibrium

An individual walks out of his air-conditioned (75°F) home into the hot outside environment (85°F). His ability to adjust to this changing environment involves a mechanism similar to

• the regulation of water loss by guard cells in plant leaves

• the digestion of carbohydrates by enzymes

• using ATP for the diffusion of water

• glucose production in the pancreas

If body temperature is too high, some blood vessels increase in size and sweat glands will excrete sweat, resulting in a lower body temperature. These changes are an example of

• a learned behavior

• feedback mechanisms

• an inherited disorder

• genetic mutations