Transport Across Cell Membrane Flashcards
What is the function of the cell membrane?
To control the movement of substances into and out of the cell.
True or False: The cell membrane is selectively permeable.
True
What are the two main methods of transport across the cell membrane?
Passive transport and active transport.
Fill in the blank: Passive transport does not require ________.
Energy
Which type of transport requires energy input from the cell?
Active transport
What is the process where molecules move from an area of high concentration to an area of low concentration?
Diffusion
What is the diffusion of water molecules called?
Osmosis
Fill in the blank: Osmosis is the movement of ________ molecules across a selectively permeable membrane.
Water
Fill in the blank: Active transport moves substances ________ their concentration gradient.
Against
What is the primary energy source for active transport?
ATP
What is the term for the movement of substances across the cell membrane without the use of energy?
Passive transport
Which type of transport allows cells to maintain homeostasis by controlling internal conditions?
Transport across the cell membrane
What the function of cell membrane
Separates the cell contents from the sourroundings
The proteins on the surface of the cell membrane act as receptor sites for sntibodies and hormone
Channels or pores in the cell membrane allow molecules to enter and exit cell
This depends on the size and concentration
Cell membrane only allow small molecules to go through
What does diffusion allow in our bodies
Allows gas exchange between alveoli, blood capillaries and body cells
The process of diffusion between alveoli capillaries and body cells
Oxygen diffuses from the cell wall of alveoli to cell wall of capillaries to red blood cells
Absorption of digested food
The proteins and carbohydrates that we eat are digested to form amino acids and glucose.In the small intestine the glucose and amino acids are diffuse use into the blood capillaries located in villi
Importance of diffusion in plants
Gases diffuse in and out of the plant vis stomata.Water from the soil enters the plant through the root hair spells via osmosis
What happens to a animal cell left in water concentration higher then what it has
The water moves in and since animal cell has no vacuole or cell wall it burst
What happens animal cell in salt concentration wich btw will have a low water concentration
They animal cell shrinks
What happens to plant cell in high water concentration
The vacuole plant cell will becom fat so turgid
What happens to plant cell when there is a water concentration that is lower than it has
The plant cell becomes plasmolysed so the vacuole starts pulling away from cell membrane and looks manky
Active transport
Uses energy (atp).It moves against the concentration gradient.The carrier proteins are the boss man as they recognise the molecule or ion and transport it across the cell membrane
Examples of active transport in animal and plant
For animal there is sodium ions pumped out and pottsaioum ions are pumped into the cells.This helps muscles function.In plants iodine coming into the sea weed.from low concentration to higher bc active transport
