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Questions and Answers
What is the main requirement for primary active transport to occur?
What is the main requirement for primary active transport to occur?
- Low concentration of ATP
- Presence of a specific carrier and energy (correct)
- Low concentration of the transported substance
- High concentration of the transported substance
What is the definition of primary active transport?
What is the definition of primary active transport?
- Transport of a substance with its electrochemical gradient without using energy
- Transport of a substance against its electrochemical gradient without using a carrier
- Transport of a substance with its electrochemical gradient by a specific carrier
- Transport of a substance against its electrochemical gradient by a specific carrier using energy (correct)
Which of the following is an example of primary active transport?
Which of the following is an example of primary active transport?
- Passive diffusion of water
- Sodium-potassium pump (correct)
- Facilitated diffusion of glucose
- Simple diffusion of oxygen
In which type of cells is the H+ pump present?
In which type of cells is the H+ pump present?
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What is the function of the calcium pump in muscle fibers?
What is the function of the calcium pump in muscle fibers?
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Study Notes
Primary Active Transport
- The main requirement for primary active transport to occur is the direct use of energy, typically in the form of ATP.
- Primary active transport is defined as the movement of molecules across a cell membrane from a low concentration to a high concentration, using energy from ATP.
Examples and Cellular Locations
- An example of primary active transport is the Sodium-Potassium pump.
- The H+ pump is present in epithelial cells, which line the surfaces of tissues and organs.
- The calcium pump is present in muscle fibers, where it regulates muscle contraction and relaxation by controlling calcium ion concentrations.
Functions of Pumps
- The function of the calcium pump in muscle fibers is to pump calcium ions out of the cytosol and back into the sarcoplasmic reticulum, allowing the muscle to relax.
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