Biology questions

1.-What is endocytosis? Please give an example. 2.- What happens to a red blood cells if they are exposed to an hypertonic environment? Why ? 3.- What is the difference between passive and a active transport? Please give examples. 4.- What is a plasmodesmata? 5.- Please name and explain the different membrane proteins. 6.- What is pinocytosis ? 7.- Why is important the Na/K ATPasa pump? Is active or passive?