5 Questions
What is the main requirement for primary active transport to occur?
Presence of a specific carrier and energy
What is the definition of primary active transport?
Transport of a substance against its electrochemical gradient by a specific carrier using energy
Which of the following is an example of primary active transport?
Sodium-potassium pump
In which type of cells is the H+ pump present?
Parietal cells of the stomach and renal tubule cells
What is the function of the calcium pump in muscle fibers?
Pumps Ca2+ to the inside of the sarcoplasmic reticulum
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.
Test your knowledge of active transport and cell transport mechanisms with this quiz. Learn about primary and secondary active transport, endocytosis, and exocytosis.
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