With the end of the 20 17 college entrance examination mathematics subject, what parents and candidates want to know most is nothing more than the answers to the college entrance examination mathematics questions. Below, I will provide you with the questions and answers of the 20 17 national college entrance examination comprehensive science paper for parents and students' reference, and wish the college entrance examination students good results this year.

3 1.(8 points)

Plasma osmotic pressure can be divided into colloid osmotic pressure and crystalline osmotic pressure. Among them, the osmotic pressure formed by macromolecular substances such as protein is called colloidal colloid osmotic pressure, and the osmotic pressure formed by small molecular substances such as inorganic salts is crystalline osmotic pressure. Answer the following questions:

(1) When the protein content in human plasma is significantly reduced due to a disease, the colloid osmotic pressure of plasma is reduced, and water enters the interstitial fluid from _ _ _ _, which may cause tissue edema.

(2) After normal people drink a lot of clean water, the osmotic pressure in the gastrointestinal cavity decreases, and the amount of water absorbed into the plasma through the gastrointestinal tract will be _ _ _ _ _ _ _ _ _, thus causing the osmotic pressure of crystals.

(3) In the human body, the functions of internal environment are: ① the direct environment for the survival of cells; ② _ _ _ _ _ _.

The answer to this question is

(1) plasma

(2) Increase and decrease

(3) The second circle provides nutrients and oxygen for cells and transports the end products of cell metabolism.

The above are some questions and answers of a comprehensive science examination paper in the national college entrance examination for reference only.