Transport accross a cell membrane

Kirsty Lesniak
Flashcards by Kirsty Lesniak, updated more than 1 year ago
Kirsty Lesniak
Created by Kirsty Lesniak over 7 years ago


Anatomy and Physiology Flashcards on Transport accross a cell membrane, created by Kirsty Lesniak on 09/21/2013.

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Question Answer
Passive, random movement of uncharged particles from regions of high to regions of low concentration. Simple diffusion
Cell mediated movement from regions of high concentration to regions of low concentration for larger particles; requires no extra energy, carrier protein changes spontaneously Facilitated diffusion
Movement of a solvent, through a semi-permeable membrane to create an equal concentration of solute molecules. Osmosis
Simple diffusion
Facilitated diffusion
Uses energy from to transport material against a gradient; that can be concentration, pressure, osmotic or voltage Primary active transport
What is the sodium potassium pump? it is the most common primary active pump found in most cell membranes. It is responsible for maintaining the high potassium low sodium levels of the intracellular fluid.
Sodium potassium pump: a primary active pump
Primary active pump found in the sarcoplasmic reticulum (SR) of muscle cells. Moves ions back in to SR after contraction. Calcium pump
Movement of one type of molecule is brought about due to a change in shape of the carrier protein caused by another molecule being transported. Secondary active transport
What is a uniporter? A membrane protein which can transport a single particle in one direction – e.g. facilitated diffusion of glucose
What are symporters? Membrane proteins which can transport two particles in the same direction – e.g. secondary active glucose transport
What is an antiporter? A membrane protein which can transport molecules in opposite directions – e.g. sodium / calcium and sodium / hydrogen exchangers
Process which transports particles into the cell by trapping them in vesicles produced from the cell membrane. Endocytosis
Process which transports particles out of the cell in to the ECF with using vesicles produced by the cell membrane. Exocytosis
The name given to the difference in voltage between the inside of the cell and the outside of the cell, across the cell membrane. Membrane potential
The inside of the cell membrane generally has a more positive, or negative charge? Negative
The outside of the cell membrane generally has a more positive, or negative charge? Positive
How many mV is the membrane potential of cardiac cells? -90mV
How many mV is the membrane potential of red blood cells? -10mV
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