Movement Across Cell Membranes Grade 8 Science Ms

Movement Across Cell Membranes Grade 8 Science Ms. Nilmalgoda

Diffusion Activity: The Party Farter

Diffusio n

Diffusion Across a Membrane

Diffusion Across a Membrane More Oxygen OUTSIDE the Cell Oxygen Diffuses INTO the Cell

Osmosis Quick review of some terms …

PARTS OF A SOLUTION SOLUTE SOLVENT SOLUTION Substance that dissolves in a solvent (the part that is mixed in). Substance that dissolves a solute. The result of a solute dissolved in a solvent; the resulting mixture.

PARTS OF A SOLUTION

Osmosis • Specifically, the movement of WATER across a semipermeable membrane. • Water moves from a dilute solution (HIGH concentration of water) to a concentrated solution (LOW concentration of water) • With OSMOSIS we are focusing on the movement of the SOLVENT (whereas with DIFFUSION, we are focusing on the movement of the SOLUTE)

Osmosis

Videos! Diffusion: https: //www. youtube. com/watch? v=T 7 rb. EJrlyvk Osmosis: https: //www. youtube. com/watch? v=Km. Qy. VWtxeq. M&t=41 s https: //www. youtube. com/watch? v=Ia. Z 8 Mt. F 3 C 6 M

Gummy Bear Osmosis https: //www. youtube. com/watch? v=Hq. Kl. Lm 2 Mjk. I

Active Transport • Movement across a membrane AGAINST concentration gradient. • In other words, from LOW concentration to HIGH concentration. • REQUIRES ENERGY!

Active Transport

Active Transport is like a . . . https: //www. youtube. com/watch? v=p. RBLnth 4 o. Sg . . . Japanese subway station?

Animation of Diffusion, Osmosis, and Active Transport https: //www. abpischools. org. uk/topic/homeostasis-kidneys/3/1

Reminder: The Particle Theory • All matter is made of particles. • Particles are constantly in motion (moving). Adding heat or energy will make particles move faster. • There attractive forces between particles. There is also space between particles. • All particles of one substance are the same. Different substances are made of different particles.