Question

passive and active transport passive transport passive transport is a process that helps cells move substances across their outer membranes without using energy. its like things moving on their own down a hill - it doesnt require extra effort from the cell. passive transport means particles move from an area of high concentration to an area of low concentration. one example of passive transport is simple diffusion. think of a room where someone sprays perfume. eventually, the scent spreads throughout the room because the perfume particles move from areas of higher concentration (where it was sprayed) to areas of lower concentration (the rest of the room). similarly, in cells, substances like oxygen and carbon dioxide move in and out through the cell membrane by simple diffusion, from areas of high concentration to low concentration. another type of passive transport is facilitated diffusion. this is like having special doors for certain substances. these doors, called transport proteins, help larger molecules like glucose or ions move across the cell membrane. they still go from high to low concentration, but they need these specific proteins to get through. osmosis is another form of passive transport and involves the movement of water. if there is no water involved, it is not osmosis. if a cell has a higher concentration of solutes (dissolved substances) inside than outside, water will flow into the cell to balance it out. think about it... 1. passive transport means substances move from an area of __________ to an area of ________. 2. briefly explain the difference in the three types of passive transport. __________ 3. osmosis involves only a. milk b. nitrogen c. oxygen d. water

Explanation:

1. The text clearly states that passive transport is the movement of substances from high to low concentration.
2. Simple diffusion is the movement of small substances like oxygen and carbon - dioxide across the cell membrane without help. Facilitated diffusion uses transport proteins to move larger molecules or ions from high to low concentration. Osmosis is the movement of water across a membrane to balance solute concentrations.
3. The text explicitly mentions that osmosis involves the movement of water.

Answer:

1. high concentration; low concentration
2. Simple diffusion is the movement of small substances across the cell membrane without assistance. Facilitated diffusion uses transport proteins to move larger molecules or ions from high to low concentration. Osmosis is the movement of water to balance solute concentrations.
3. d. water