2.4 HOW SUBSTANCES MOVE INTO AND OUT OF CELLS

Page 115-119

1. Substances move through the cell membrane by ______.

2. Diffusion is the gradual mixing of two substances. It is also where particles in a

high concentrated area ______to an area of ______concentration. It is nature’s way of “______” or “______”. The process continues until the concentration is the same everywhere.

Diagram of diffusion (see page 115)

CELL MEMBRANE AND DIFFUSION

Page 116

3. Particles of many substances move in and out of cells by diffusion. The cell membrane is like a ______that has small ______. Small enough to keep the ______and ______inside the cell but allow selected substances (like oxygen) outside thecell to ______through. Because of this feature the cell membrane is called S______P______.

4. Draw what would happen after a period of time.

5. Cells need certain materials in order to survive. Oxygen is needed by the

mitochondria. Oxygen particles are small enough to diffuse through the cell membrane. This movement occurs because the concentration of oxygen is ______outside the cell than inside the cell.

5. Water particles are also small enough to diffuse through the cell membrane. Water in the ground is needed in the leaves of a plant for photosynthesis. Water gets there by the process called ______(a special name given for the ______of water across a membrane)

2.5 CELLS in MULTICELLULAR ORGANISMS = TISSUE  ORGANS

Page 120-124

  1. Why are unicellular cells tiny?
  1. When unicellular organisms get too large they reproduce. Diagram out the

reproduction of an amoeba by BINARY FISSION. (page 121)

  1. How do your cells reproduce? This process is needed for growth, development

and repair of cells.

4. You and most multicellular organisms have cellsthat are made up of ______cells. These cells carry out a ______or functions needed to support ______.

5. An example of a specialized cell is your red blood cell. What is your red blood cells special function?

6. Red blood cells do not reproduce by binary fission. What part of the cell controls

cell division?

  1. A group of specialized cells (similar structure and function) are called

______. (pg 103)

8. A group of tissues that performs a special function is called an ______,

an example is ______. A group of organs that work together for a

common purpose (to keep you alive) is called an ______. Cells

combine to form ______which combine to form ______.

The network of several organs forms an ______system. (pg 103)

9. Complete the chart of the four types of human (animal) tissues and describe their

main purpose.

TISSUE / PURPOSE/FOUND / DIAGRAM
Supports and connects different parts of the body
Blood, fat, cartilage, bones and tendons /
Covers the surface of your body and the outside of your organs. Lines the inside of organs (intestines) /
Sends messages from place to place in body
Makes up the brain, spinal cord and nerves /
Allows you to move-skeletal muscles-
Cardiac tissue makes up the heart-pumps blood
Lines organs, moves food along your digestive system /

10. Name the plant tissues.

If time look at the tissue types under the microscope.