Flashcards in Chapter 5 Deck (17):
Because water can move freely between the compartments of the body they are considered to be in what?
The movement of water across a membrane due to concentration gradients
Define osmotic pressure
The pressure that directly opposes the osmotic movement of water
What is defined as osmoles of a solute per kilogram of water?
If a cell gains water in a solution the solution is what compared to a cell?
What happens to a cell in hypertonic solution?
What molecules enter the cell easily?
Oxygen, carbon dioxide, and lipids
Which molecules do not enter the cell easily?
ions, polar molecules, large molecules.
What two characteristics affect a molecules movement across a membrane?
Size and lipid solubility
What is mediated transport?
The movement of molecules across a membrane with the help of membrane proteins.
If the movement stops when the concentration gradient is equal, what is the name of the process?
What are the two main types of transport proteins?
Channel and Carrier
What are the three types of gated channels?
Chemically gated, Voltage Gated, and mechanically Gated
symport carriers move molecules in what direction?
The same direction
Describe the steps of movement through a carrier protein
The molecule binds to the carrier protein
The binding causes a confrontational change
The carrier opens to the other side and releases the molecule
What does active transport move molecules against?
Their concentration gradient