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What is one example of a substance using facilitated transport and one example of a substance using active transport?
Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout. Some major examples of diffusion in Biology:
• Gas exchange at the alveoli - oxygen from air to blood, carbon dioxide from blood to air.
• Gas exchange for photosynthesis - carbon dioxide from air to leaf, oxygen from leaf to air.
• Gas exchange for respiration - oxygen from blood to tissue cells, carbon dioxide in opposite direction.
• Transfer of transmitter substance - acetylcholine from presynaptic to postsynaptic membrane at a synapse.
• Osmosis - diffusion of water through a semipermeable membrane.
Facilitated Diffusion
This is the movement of specific molecules down a concentration gradient, passing through the membrane via a specific carrier protein. Thus, rather like enzymes, each carrier has its own shape and only allows one molecule (or one group of closely related molecules) to pass through.eg
Common molecules entering/leaving cells this way include glucose and amino-acids.
Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution - down the water potential gradient.
Some major examples of osmosis
• Absorption of water by plant roots.
• Re-absorption of water by the proximal and distal convoluted tubules of the nephron.
• Re-absorption of tissue fluid into the venule ends of the blood capillaries.
• Absorption of water by the alimentary canal - stomach, small intestine and the colon.
Major examples of Active Transport
1) Re-absorption of glucose, amino acids and salts by the proximal convoluted tubule of the nephron in the kidney .
2)Sodium/potassium pump in cell membranes (especially nerve cells)
What else can I help you with?
What processes could result in the net movement of a substance into a cell if the substance is more concentrated in the cell than in the surroundings?
Active transport or facilitated diffusion could result in the net movement of a substance into a cell if it is more concentrated inside the cell than in the surroundings. In active transport, energy is required to move the substance against its concentration gradient. In facilitated diffusion, specific carrier proteins help the substance move into the cell down its concentration gradient.
How do faciliated diffusion and active transport differ?
In active transport, the molecules are carried against the force of diffusion. This is the opposite of facilitated transport. Also in active transport, energy in the form of ATP is required, since the molecules move against the normal flow. Note that energy is not needed in facilitated transport. Bard, Susan, Mary Alice Jost. Multimediated Lectures in Biology. Seventh Edition. Howard Community College, MD. 2003. ---------------------------------------------------------------------- *Active transport: Transport of molecules AGAINST the concentration gradient with the use of a PROTEIN CARRIER. This uses ATP. Facilitated transport: Moving of molecules through a semi permeable membrane witht he use of the cell's "facility's" AKA Protein carriers or Channels. *Gowda, Vishal. 10th Grade AP Biology Student. How about that? 2008 son!
In what ways are active transport and facilitated diffusion similar?
Active transport and facilitated diffusion are similar in that they both involve the movement of molecules across a cell membrane, but they differ in that active transport requires energy input from the cell, while facilitated diffusion does not.
Is osmosis an example of facilitated diffusion or active transport?
Osmosis is an example of passive transport, specifically a type of facilitated diffusion. In osmosis, water molecules move across a semipermeable membrane from an area of high concentration to an area of low concentration without the use of energy.
How does facilitated transport differ from active transport in terms of the energy requirements and mechanisms involved in moving molecules across a cell membrane?
Facilitated transport and active transport are two ways molecules can move across a cell membrane. Facilitated transport does not require energy from the cell, while active transport does require energy in the form of ATP. Facilitated transport uses carrier proteins to help molecules move across the membrane, while active transport uses pumps to move molecules against their concentration gradient.
How is faciliated transport similar to active transport?
Both facilitated transport and active transport require the substance that passes the membrane to pass through intermembrane proteins. However, unlike active transport, facilitated transport does not require ATP because it is not actively going against the concentration gradient.
What processes could result in the net movement of a substance into a cell if the substance is more concentrated in the cell than in the surroundings?
Active transport or facilitated diffusion could result in the net movement of a substance into a cell if it is more concentrated inside the cell than in the surroundings. In active transport, energy is required to move the substance against its concentration gradient. In facilitated diffusion, specific carrier proteins help the substance move into the cell down its concentration gradient.
Is facilitated diffusion an example of active transport?
No, facilitated diffusion is a type of passive transport where molecules move across a cell membrane with the help of transport proteins. Active transport, on the other hand, requires energy to move molecules against their concentration gradient.
How is facilitated transport different from active transport?
Facilated transport does not need to use energy but active transport does.
What are Vesicle mediated transport is a type of?
facilitated diffusion, secondary active transport and active transport
What does facilitated diffusion do in a cell?
It allows for the flow of substances which are normally too large to pass through the cell membrane. Like active transport, it accomplishes this using channel proteins coded for each specific substance (sugar, for example). Unlike active transport, facilitated diffusion only works WITH the osmotic pressure gradient, not against.
How do faciliated diffusion and active transport differ?
In active transport, the molecules are carried against the force of diffusion. This is the opposite of facilitated transport. Also in active transport, energy in the form of ATP is required, since the molecules move against the normal flow. Note that energy is not needed in facilitated transport. Bard, Susan, Mary Alice Jost. Multimediated Lectures in Biology. Seventh Edition. Howard Community College, MD. 2003. ---------------------------------------------------------------------- *Active transport: Transport of molecules AGAINST the concentration gradient with the use of a PROTEIN CARRIER. This uses ATP. Facilitated transport: Moving of molecules through a semi permeable membrane witht he use of the cell's "facility's" AKA Protein carriers or Channels. *Gowda, Vishal. 10th Grade AP Biology Student. How about that? 2008 son!
Is facilitated diffusion active?
No. Facilitated diffusion is a type of passive transport.
In what ways are active transport and facilitated diffusion similar?
Active transport and facilitated diffusion are similar in that they both involve the movement of molecules across a cell membrane, but they differ in that active transport requires energy input from the cell, while facilitated diffusion does not.
How is active transport different than simple and facilitated diffusion?
simple and facilitated diffusion don't require energy and are forms of passive transport. Active transport requires energy
Is osmosis an example of facilitated diffusion or active transport?
Osmosis is an example of passive transport, specifically a type of facilitated diffusion. In osmosis, water molecules move across a semipermeable membrane from an area of high concentration to an area of low concentration without the use of energy.
How does facilitate transport differ from active transport?
Facilitated transport occurs when a substance moves from an area of higher concentration to an area of lower without the aid of energy. Active transport involves additional energy as it is moving from a lower concentration into a higher concentration.
