square 17. If two solutions have the same solute concentration and the same water concentration, they are said to be __ to each other. square 18. What condition occurs if too much water leaves the cell and the cell collapses? square 19. The outside of the membrane often has small carbohydrates attached. What is the purpose of these carbohydrates? square 20. The passive movement of certain molecules across a membrane through protein channels. square 21. The process of engulfing droplets of extracellular fluid.

17. If two solutions have the same solute concentration and the same water concentration, they are said to be **isotonic** to each other.<br /><br />18. If too much water leaves the cell and the cell collapses, the condition is known as **crenation**.<br /><br />19. The outside of the membrane often has small carbohydrates attached. The purpose of these carbohydrates is to act as **cell recognition sites**.<br /><br />20. The passive movement of certain molecules across a membrane through protein channels is known as **facilitated diffusion**.<br /><br />21. The process of engulfing droplets of extracellular fluid is called **pinocytosis**.