Exploring Passive Transport Mechanisms

This video tutorial explains passive transport, focusing on diffusion, osmosis, and facilitated diffusion. It illustrates how molecules move across cell membranes without energy expenditure, using examples like oxygen and carbon dioxide exchange in the body. The video also covers the effects of different environments on cells, such as hypotonic and hypertonic conditions, and explains how larger molecules like glucose use protein channels to pass through cell membranes.

What is an example of passive transport?

• Endocytosis

• Diffusion

• Active transport

• Exocytosis

What molecule is often referred to as the 'money' of the cell?

• Adenosine triphosphate (ATP)

• Carbon dioxide

• Oxygen

• Glucose

In passive transport, molecules move from an area of _____ concentration to an area of _____ concentration.

• low; low

• equal; equal

• high; low

• low; high

What is the state called when molecules are evenly spread out in a container?

• Diffusion

• Equilibrium

• Facilitated diffusion

• Osmosis

How does oxygen enter a cell?

• By osmosis

• By active transport

• By facilitated diffusion

• By diffusion

What is the high oxygen concentration area in the lungs?

• Bloodstream

• Alveoli

• Heart

• Diaphragm

What happens to a cell in a hypotonic environment?

• It shrivels

• It remains the same

• It swells

• It bursts immediately

Why did the potato slice in distilled water gain weight?

• It absorbed salt

• It absorbed water

• It lost water

• It lost salt

What does facilitated diffusion require to help larger molecules pass through the cell membrane?

• Active transport

• Osmosis

• Protein channels

• ATP energy

Which molecule is too large to pass directly through the cell membrane and requires facilitated diffusion?

• Water

• Oxygen

• Carbon dioxide

• Glucose