Exploring Diffusion and Osmosis Concepts

This video covers the functions of cell membranes, focusing on transport mechanisms. It explains passive transport, including diffusion and osmosis, and how molecules move from high to low concentration without energy. The video also discusses osmosis in isotonic, hypertonic, and hypotonic solutions, and its effects on cells. Active transport, requiring energy, is contrasted with passive transport, and processes like endocytosis and exocytosis are explained. The video concludes with a discussion on cystic fibrosis and its relation to cell membrane function.

What are the two main functions of the cell membrane?

• To facilitate cell division and growth

• To provide energy and store nutrients

• To protect from the external environment and regulate what goes in and out

• To produce proteins and store genetic information

Which type of transport requires energy input from the cell?

• Simple diffusion

• Active transport

• Facilitated diffusion

• Passive transport

What is the main characteristic of passive transport?

• It does not require energy

• It moves molecules from low to high concentration

• It involves endocytosis

• It requires ATP

What is the movement of molecules from an area of high concentration to an area of low concentration called?

• Osmosis

• Diffusion

• Active transport

• Facilitated diffusion

What is osmosis specifically the diffusion of?

• Sugar

• Salt

• Proteins

• Water

In a hypertonic solution, what happens to a cell?

• It bursts

• It shrinks

• It stays the same

• It expands

What is the process called when a cell engulfs large molecules?

• Osmosis

• Exocytosis

• Endocytosis

• Facilitated diffusion

What is the opposite process of endocytosis?

• Exocytosis

• Active transport

• Osmosis

• Diffusion

What causes cystic fibrosis in relation to the cell membrane?

• Overactive mitochondria

• Excessive water intake

• Mucus blocking protein channels

• Lack of ATP production

What is the main problem caused by mucus buildup in cystic fibrosis?

• Respiratory infections and difficulty breathing

• Enhanced nutrient absorption

• Improved oxygen intake

• Increased energy production