Homeostasis Quiz

1. Which statement best defines homeostasis?

• A. The maintenance of a constant internal environment within the body
• B. The process by which the body loses heat to the environment
• C. The production of hormones by the pancreas
• D. The contraction of muscles to generate body heat

2. Which hormone is secreted by the pancreas to decrease blood glucose concentration?

• A. Glucagon
• B. Insulin
• C. Adrenaline
• D. Thyroxine

3. A person's body temperature rises above the set point. Which response is triggered to restore normal temperature?

• A. Shivering and vasoconstriction of arterioles in the skin
• B. Sweating and vasodilation of arterioles supplying skin capillaries
• C. Increased hair erection and reduced sweat production
• D. Decreased blood flow to the skin and muscle contraction

4. Explain how negative feedback maintains blood glucose concentration at a set point when glucose levels increase.

• A. Increased glucose stimulates glucagon release, which raises glucose levels further
• B. Increased glucose stimulates insulin release, which lowers glucose levels back towards the set point
• C. Decreased glucose prevents the pancreas from responding
• D. Increased glucose causes the liver to produce more glucose through gluconeogenesis

5. A person with Type 1 diabetes cannot produce insulin. Explain why treatment with insulin injections helps maintain homeostasis in blood glucose concentration.

• A. Insulin injections replace the missing pancreatic hormone, allowing cells to take up glucose and maintain blood glucose at the set point
• B. Insulin injections stimulate the pancreas to produce glucagon, which lowers blood glucose
• C. Insulin injections prevent the liver from storing glycogen, keeping blood glucose constant
• D. Insulin injections increase the permeability of cell membranes to prevent glucose loss