Understanding Homeostasis

What is the primary role of insulin in glucose regulation?

• The primary role of insulin in glucose regulation is to lower blood glucose levels by promoting glucose uptake and storage.

• Insulin increases blood glucose levels by inhibiting glucose uptake.

• Insulin has no effect on glucose regulation in the body.

• Insulin primarily promotes the breakdown of glucose for energy.

How does negative feedback maintain homeostasis in the body?

• Negative feedback maintains homeostasis by detecting changes and initiating responses that counteract those changes.

• Negative feedback increases changes in the body.

• Negative feedback only occurs during extreme conditions.

• Negative feedback has no effect on homeostasis.

What effect does temperature have on enzyme activity?

• Enzymes are only active at low temperatures.

• Temperature affects enzyme activity by increasing it up to an optimal point, after which it decreases due to denaturation.

• Higher temperatures always increase enzyme activity.

• Temperature has no effect on enzyme activity.

Explain the process of glucose homeostasis in the human body.

• Insulin and glucagon have no effect on blood glucose levels.

• Glucose homeostasis is solely controlled by dietary intake.

• The liver does not play a role in glucose regulation.

• The process of glucose homeostasis in the human body involves the regulation of blood glucose levels through the actions of insulin and glucagon.

How does the body regulate its temperature during exercise?

• The body maintains temperature by drinking cold water during exercise.

• The body regulates temperature by shivering and reducing blood flow to the skin.

• The body cools down by increasing muscle activity.

• The body regulates its temperature during exercise by sweating and increasing blood flow to the skin.

What happens to insulin levels when blood glucose levels rise?

• Insulin levels decrease when blood glucose levels rise.

• Insulin levels increase when blood glucose levels rise.

• Insulin levels fluctuate randomly regardless of blood glucose levels.

• Insulin levels remain unchanged when blood glucose levels rise.

Describe a negative feedback mechanism in temperature regulation.

• The negative feedback mechanism in temperature regulation involves the hypothalamus detecting increased body temperature, leading to vasodilation and sweating, which cools the body down.

• Vasodilation is triggered by decreased body temperature to retain heat.

• The hypothalamus increases body temperature through vasoconstriction and shivering.

• Sweating occurs only when the body temperature drops below normal levels.

How do enzymes function optimally at specific temperatures?

• Enzymes are inactive at all temperatures.

• Enzymes only function in acidic environments.

• Enzymes function optimally at specific temperatures due to their stable structure and increased molecular activity, which enhances reaction rates.

• Enzymes require high pressure to function optimally.

What role does the pancreas play in glucose homeostasis?

• The pancreas absorbs glucose from the bloodstream.

• The pancreas secretes hormones that increase blood pressure.

• The pancreas produces bile to aid in digestion.

• The pancreas regulates blood glucose levels by secreting insulin and glucagon.

How does the body respond to a drop in temperature?

• The body sweats to cool down.

• The body responds to a drop in temperature by shivering, constricting blood vessels, and increasing metabolic rate.

• The body stops all metabolic processes.

• The body increases blood flow to the skin.