Cells

Animal Cells

• Cell membrane;

• Cytoplasm;

• Nucleus;

Vegetal Cells

• Cell membrane;• Cytoplasm;• Nucleus;• Chloroplast;• Vacuole;• Cell wall.

SPECIALISED CELLS OF ANIMAL

• Red blood cells;

• Nerve cells;

• Female reproductive cells (egg cells);

• Male reproductive cells (sperm cells);

Red blood cells:

Function:• To carry oxygen;

• Large surface area;

• Haemoglobin.

Nerve cells:

Functions:• To carry nerve

impulses;• Long connections at

each end;• To carry electrical

signals.

Female reproductive cells (egg cells):

Functions: • To join with male cell;

• They contains lots of cytoplasm.

Male reproductive cells (sperm cells):

Functions:• To reach female cell

and join with it; • Long tail for

swimming;• head for getting into

the female cell.

SPECIALISED CELLS OF PLANTS

• Root hair cells;

• Leaf cells.

Root hair cells:

Functions:• To absorb water and

minerals; • Large surface area.

Leaf cells:

Functions:• To absorb sunlight for

photosynthesis;

• Large surface area;

• Lots of chloroplasts.

DIFFUSION

Diffusion

Dissolved substances have to pass through the cell membrane to get into or out of a cell.

From a high to a low concentration (concentration gradient ).

OSMOSIS

Osmosis is the movement of water from a less concentrated solution to a more concentrated solution through a partially permeable membrane.

Concentration is the same.