Transport Types
This type of transport does not require ATP.
What is passive transport?
This structure controls what enters and leaves a cell.
What is the plasma membrane?
This substance moves across a membrane during osmosis.
What is water?
This is the maintenance of a stable internal condition.
What is homeostasis?
A student places a potato slice in water. After an hour, the potato has gained mass. This substance moved into the potato cells
What is water?
This process is the movement of water across a semipermeable membrane.
What is osmosis?
These molecules make up the main structure of the plasma membrane.
What is phospholipids?
During osmosis, water moves from an area of ______ water concentration toward an area of this ______ water concentration.
What is high to low?
A person's body temperature rises with the hot environment. The heat would be considered the __________.
A red blood cell is placed in a solution with a higher concentration of salt outside the cell. The cell loses water and becomes smaller. This process is called ___________.
What is osmosis?
Small molecules (NOT WATER) naturally move from an area of high concentration to an area of low concentration through this process.
What is diffusion?
A membrane that allows some substances through but blocks others is described by this term
What is semipermeable?
A cell placed in an environment with more water outside than inside will most likely do this.
What is swell/take water in?
A person becomes dehydrated, and the kidneys conserve more water. What is the kidneys do is considered _____________.
What is the response?
A cell needs to move a substance from low concentration to high concentration. This is the type of transport the cell must use.
What is active transport?
A molecule is moving from an area of low concentration to an area of high concentration. The cell must use ATP to move it. What type of transport is occurring?
What is active transport?
These structures help big molecules cross the membrane when they cannot pass easily through the phospholipid bilayer.
What is protein channels?
A cell loses water and shrinks after being placed in a solution. Water moved in this direction.
What is water moved out of cell?
Sweating lowers an elevated body temperature and helps return it toward normal. This type of feedback helps restore balance.
What is negative feedback loop?
A student places two identical cells into different solutions. Cell A gains mass while Cell B loses mass. The environment around Cell A must have had a lower concentration of this substance.
What is chemical?
A substance is too large or charged to easily pass through the phospholipid bilayer. Special proteins in the membrane help it cross. What structures are being used?
What is protein channels?
If a cell's plasma membrane could no longer control what enters and leaves, the cell would have difficulty maintaining this.
What is homeostasis?
A cell contains 90% water. The surrounding solution contains 90% water. This is what you would expect the cell's size to do.
What is stay the same?
In this type of feedback, the response increases or strengthens the original change rather than reducing it.
What is a positive feedback loop?
A runner's body temperature rises while exercising. The body responds by producing sweat, which lowers the temperature. This example demonstrates all three: stimulus, response, and this type of feedback.
What is negative feedback loop?