Osmosis and Cytosis

Osmosis and Cytosis

Learning methods of cellular transport

• What is osmosis?

• What is the difference between a solute and a solvent?

• How do label areas of low solute concentration vs high solute concentration?

• What is the difference between endocytosis and exocytosis?

​Cues

​Main Idea: What molecules are brought into and out of the cell during diffusion, facilitated diffusion, osmosis, and active transport?

Osmosis is the passive diffusion of water (H₂O) molecules into and out of the cell membrane.

This moves with the concentration gradient (from high to low.

​

concentration gradient - Molecules want to move from areas tightly packed with molecules to areas that are less crowded

What is osmosis?

​

Poll

Is osmosis passive or active transport?

• passive

• active

Multiple Choice

What molecule is being diffused during the process of osmosis?

• water

• glucose

• amino acids

• lipids

​An isotonic solution is one in which the solutes in the fluid are equal to that inside the cell.

​

When the ​concentration is the same inside the cell, and outside the cell, it is considered to be in equilibrium. Flow will be equal inside and outside.

​

​Some text here about the topic of discussion.

Water movement based on solute concentration​

​

When the concentration of solutes inside the cell is greater than the surroundings.

​

The net movement of water will be into the cell.​

Hypotonic​

When the concentration of solutes inside the cell is less than the surrounding fluids.

​

The net movement of water will be out of the cell.​

​​Hypertonic

Multiple Choice

A red blood cell placed in distilled water will

swell and burst due to the diffusion of

• salt from the red blood cell into the water

• water into the red blood cell

• water from the blood cell leaving to the environment

• salt from the water into the red blood cell

When the cell membrane pinches off and brings materials INTO the cell.

​

This is needed for large molecules like protein chains or when white blood cells eat bacteria​.

Endocytosis

​

When vesicles are brought to the membrane and materials are removed from the cell.

​

This is how the cell removes waste products or brings lipids to the membrane​

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Exocytosis

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Poll

Do you think cytosis is active or passive transport?

• Active

• Passive

Match

Match the molecule with the process that can transport it

• glucose

• water

• CO₂

• Waste

• large protein molecules

facillitated diffusion

osmosis

diffusion

exocytosis

active transport

• facillitated diffusion

• osmosis

• diffusion

• exocytosis

• active transport

Multiple Choice

After a cookie has been digested, glucose molecules enter the bloodstream by the process of

• phagocytosis

• diffusion

• ingestion

• pinocytosis

Multiple Choice

If the external environment of a living cell has a

greater concentration of salt than the cytoplasm

within the cell, the cell will tend to

• divide

• increase in size

• excrete salt

• lose water

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