ANTH-110 Lecture Notes - Lecture 9: Solution

• School: MacEwan University
• Department: Anthropology
• Course: ANTH-110
• Professor: A N O N Y M O U S

Document Summary

Water is the main component of all cells. We ind water in the cytoplasm and in cell sap. This water contains many dissolved substances and these substances plus the water enter and leave the cells through the cell membrane. The cell membrane allows certain particles through it but it blocks the passage of others. Because of this nature it is described as a partially (or selectively) permeable membrane. Particles enter and leave cells by three processes: (cid:20)difusion. Particles in liquids and gases have kinetic energy, therefore they move about at speed in all directions. Where there is an area of high concentration some of these particles collide into one another, lose energy and slow down. Others will escape from the area of high concentration to an area of low concentration elsewhere. The result is a concentration gradient with particles difusing from an area of high concentration to an area of low concentration.