Select the correct statments regarding transport of molecules across the cell membrane. Non-mediated transport is susceptible to saturation of transporter/channel proteins. Channels and transporters need not use energy to transport solute down the concentration gradient. The Na+/K+ antiport takes advantage of electrochemical gradients to exchange Na+ and K+ ions across the cell membrane. Active transport via electrochemical gradients relies on the passive transport of one solute to transport a second solute against the concentration gradient.

Select the correct statments regarding transport of molecules across the cell membrane. Non-mediated transport is susceptible to saturation of transporter/channel proteins. Channels and transporters need not use energy to transport solute down the concentration gradient. The Na+/K+ antiport takes advantage of electrochemical gradients to exchange Na+ and K+ ions across the cell membrane. Active transport via electrochemical gradients relies on the passive transport of one solute to transport a second solute against the concentration gradient.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 6RE

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Using the answer code on the right, indicate which membrane component is responsible for the function in question: 1. channel formation____________________________________ (a) lipid bilayer 2. barrier to passage of water- __________________ (b) proteins soluble substances ____________________________________ (c) carbohydrates 3. receptor sites 4. membrane fluidity 5. recognition of self 6. membrane-bound enzymes 7. structural boundary 8. carriers
Liver cells are in contact with the blood and exchange a variety of substances with the blood plasma (the noncellular part of blood). The concentration of water is equal in the cytoplasm of liver cells and in the blood plasma. Explain this observation in terms of membrane permeability and transport mechanisms. Animal cells typically maintain a higher concentration of Na+ outside the cell and a higher concentration of K+ inside the cell via the Na+-K+ pump. The drug ouabain inhibits the activity of the Na+-K+ pump. A nerve cell is incubated in ouabain. Predict what will happen to the concentrations of Na+ and K+ inside and outside the nerve cell as a result.
difference between channels and transporters is that O Only channels allow for the passage of solutes against their electrochemical gradient. OTransporters allow for a greater rate of transport across a membrane than channels do. O Only channels allow for the transport of ions. Transporters must undergo a conformational change upon binding to the solute.
Passive transport across the membrane mediated by a carrier— would not be saturated by increasing amount of substance to be transported. does not require energy (ATP). can be driven in reverse. moves the solute through the membrane in the “uphill” direction of their concentration gradient. is faster than transport mediated by channel proteins.
Which of the following describe active transport or is an example of act transport of a substance across a membrane? Choose all correct answer Glucose transport into intestinal epithelial cells Glucose transport into muscle cells Na* ion pumping out and K* ion pumping into the cell Transport requires a mediator Requires input of energy for transport Movement of ligand against the concentration gradient
When the nerves deliver a signal to contract, Ca++ (calcium ions) rush into the cell. The calcium ion influx causes specialized fibers to contract. Afterward, calcium ions are pumped out of the cell by calcium ATPases. What transport type(s) is occuring?s antiporter only ion gated transport followed by active transport active transport only ion gated transport only active transport followed by ion gated transport
Compare and contrast the following methods of a passing cell membrane in terms of movement with respect to the concentration gradient, use of ATP, and the use of transporters with examples. Active Transport vs Passive Transport
Compare and contrast the following methods of a passing cell membrane in terms of movement with respect to the concentration gradient, use of ATP, and the use of transporters with examples. (Simple) Diffusion Facilitated Diffusion/Passive Transport Osmosis Active Transport Exocytosis Endocytosis (with its 3 subforms)
Diffusion and osmosis classification Classify the following characteristics based on whether they are describing diffusion, osmosis, or both. Diffusion Results in an Can occur with equal distribution of solute molecules or without a membrane Always involves the movement of water Requires a semi-permeable membrane Osmosis Involves the movement of gases, ions, and small water soluble molecules Passive form of movement that requires no energy Moves from areas of high concentration to low Both Diffusion and Osmosis Responsible for gas exchange in the lungs concentration A 3 of 15 Next > Cation to open the document "Epicinstaller-13.0.0-fortnite-a8e4f12cada646caa706d8be407be69f (3).msi". tv 22
In contrast to transporters and carriers, channels: O Are selective for the specific solutes (e.g., ions) they transport Require solutes (e.g., ions) to bind to them in order to be transported O Create pores through the membrane Saturate after reaching the maximum rate of transport
Which is not required for passive transport across a membrane (select all that apply and explain why): a concentration gradient a cotransported ion energy a protein channel
Discuss the methods that the cell is able to get the molecules needed for normal functions using the following terms.Active TransportPumpsATP Concentration Gradient (with and against)Simple DiffusionFacilitated DiffusionPassive TransportProteinsPhospholipids

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		Non-mediated transport is susceptible to saturation of transporter/channel proteins.
		Channels and transporters need not use energy to transport solute down the concentration gradient.
		The Na+/K+ antiport takes advantage of electrochemical gradients to exchange Na+ and K+ ions across the cell membrane.
		Active transport via electrochemical gradients relies on the passive transport of one solute to transport a second solute against the concentration gradient.