Concept explainers
To describe:
The methods of membrane transport, and suggest which substances are transported by each method.
Also, write about if the method of transport is active or passive, assisted or unassisted.
Introduction:
Any substance that passes between cells and the enveloping extracellular fluid must possess the tendency to pass through the plasma membrane. If a component can pass through the membrane, the membrane is considered permeable for that component, however, in case if the component cannot pass, then the membrane is considered impermeable to it. The plasma membrane possesses the tendency of selective permeability, that is, it allows some of the particles to go through while inhibiting the others.
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Chapter 3 Solutions
Human Physiology: From Cells to Systems (MindTap Course List)
- List the means of unassisted membrane transport.arrow_forwardDescribe the contribution of each of the following to establishing and maintaining membrane potential: (a) the Na+K+ pump, (b) passive movement of K+ across the membrane, (c) passive movement of Na+ across the membrane, and (d) the large intracellular anions.arrow_forwardDescribe the different types of membrane transport. Which require energy, and which are passive?arrow_forward
- Briefly discuss what membrane facilitated transport is ,and distinguish between the different typesarrow_forwardDescribe the passive processes of membrane transport, including simple diffusion, facilitated diffusion, and osmosis.arrow_forwardDescribe in details the processes of active transport, including the concepts of pumps, primary active transport, secondary active transport, symports, and antiports. Indicate the sources of energy for moving solutes against their concentration gradients.arrow_forward
- Define mediated transport, and compare facilitated diffusion, active transport, and secondary active transport processes.arrow_forwardDescribe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity. Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.arrow_forwardWhat factors affect the degree of membrane fluidity?arrow_forward
- Define cell membrane transport and membrane selectivity. Explain why the plasma membrane is selectively permeable. List and discuss which molecules can and cannot cross the membrane and explain why. Discuss why some molecules can cross directly while others require transport proteins.arrow_forwardFor each type of membrane transport, know the following:– Is a transporter protein required? If so, what type?– Is there an energy requirement, and if so, what is the energy source?– What is the relative rate of solute transport based on molecule type? On concentration gradient?– What are examples of the types of solutes transported by carriers and channels?arrow_forwardDefine membrane transport proteins.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning