Homeostatic mechanisms：练习题

Which hormone is primarily responsible for decreasing the concentration of glucose in the blood when it rises above the normal set point?

A person consumes a very large amount of water in a short period of time. How will the level of Antidiuretic Hormone (ADH) and the permeability of the collecting ducts in the kidney change?

Which of the following correctly describes the sequence of events involved in the excretion of nitrogenous waste in humans?

In the context of negative feedback, which organ acts as the detector for changes in blood glucose concentration?

When the water potential of the blood is too low, the pituitary gland releases more Antidiuretic Hormone (ADH). How does this affect the kidney tubules?

Identify the metabolic waste products that are removed from the body via the renal system during the formation of urine.

Explain how shivering contributes to the maintenance of a constant core body temperature when the external environment is cold.

In an experiment using Visking tubing to model a kidney, the tubing is filled with a mixture of glucose and starch. Explain why glucose is detected in the surrounding water but starch is not.

(a) State the exact definition of excretion as it applies to human physiology and list two metabolic waste products, other than urea, that are removed from the body.
(b) Name the organ where urea is formed and identify the specific chemical process involved in its production from excess amino acids.

(a) Define the term homeostasis and explain why the maintenance of a constant internal environment is essential for the activity of enzymes within the human body.
(b) Describe the changes that occur in the skin to help reduce body temperature when a person becomes too hot. In your answer, refer to the role of sweat glands and the process of vasodilation.