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The membrane allows it and cytoplasm also helps it.
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What is the barrier around the that lets substances move across it?
cell surface membrane
What is the function of a transport protien?
it helps move certain substances such as water and sugar across the membrane.
What is the movement of materials across a membrane that requires energy input called?
Active transport requires energy and proteins to move the materials across the cell membrane. This is in contrast to osmosis, which doesn't require energy to move the material.
What term identifies the concept that some substances can move freely across a cell membrane while other substances must be carried across by proteins?
selective permeability
Does Phagocytosis move substances out of a cell?
Phagocytosis is the process of moving solids across a cell membrane into a cell.
The use of energy to move substances across a cell membrane describes?
Active Transport
Which type of molecule can move passively across the membrane?
Water can move passively through a membrane by moving through the pores of a cell. Other substances cannot move through a cell membrane.
When an input of energy is required to move material through a cell membrane what transport takes place?
Active transport requires energy to move substances across a cell membrane against their gradient.
Active transport requires what?
Energy-requiring process by which substances move across the plasma membrane against a concentration gradient.
How can substances move across capillaries?
Substances typically move across capillaries via diffusion.
What membrane components allow movement of non-polar substances across membrane?
Integral proteins allow movement of non-polar substances across membranes.
What controls which substances can move in and out of a cell?
The cell membrane regulates the movement of substances in and out of the cell.How does it do this? The phospholipid bilayer is impermeable to most substances, allowing across only small, uncharged molecules such as those of oxygen, carbon dioxide, and water. The only way for other substances to cross the membrane is via transport proteins (channel and carrier proteins). These are selective, and therefore control what enters and what leaves the cell.
