Cell Membrane Transport Mechanisms

The video explains passive cell transport, focusing on diffusion and osmosis, and their role in maintaining homeostasis. It uses a fish story to illustrate why saltwater fish cannot survive in freshwater and vice versa. The video also covers the cell membrane's role in selective permeability and the importance of facilitated diffusion through protein channels. It concludes with the significance of osmoregulation in living organisms.

Why can't saltwater fish survive in freshwater environments?

• They require more sunlight.

• Their cells can't maintain homeostasis.

• Their diet is different.

• They need more oxygen.

What is the primary function of the cell membrane?

• To provide structural support.

• To produce energy for the cell.

• To store genetic information.

• To control what enters and exits the cell.

What drives passive transport across a cell membrane?

• Cellular respiration.

• Photosynthesis.

• Energy from ATP.

• Concentration gradients.

How do oxygen and carbon dioxide move across the cell membrane?

• Through active transport.

• Directly through the membrane.

• By osmosis.

• Via facilitated diffusion.

What role do transport proteins play in facilitated diffusion?

• They provide energy for transport.

• They act as channels for specific molecules.

• They break down molecules.

• They store molecules for later use.

What is osmosis?

• The breakdown of glucose.

• The movement of solutes from low to high concentration.

• The movement of water across a membrane.

• The production of energy in cells.

Why is it dangerous to drink seawater?

• It has a high concentration of salts.

• It lacks essential nutrients.

• It contains harmful bacteria.

• It is too cold.

What happens to a cell in a hypertonic solution?

• It swells and bursts.

• It becomes more active.

• It remains unchanged.

• It shrivels as water leaves the cell.

What is the result of osmoregulation in cells?

• Cells maintain a balance of salt and water.

• Cells grow larger.

• Cells divide more rapidly.

• Cells produce more energy.

How does eating salty food affect your body?

• It makes you feel less thirsty.

• It increases your energy levels.

• It improves your digestion.

• It causes water to leave your cells.