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What types of cells either form a barrier that controls passage of molecules or forms glands?
Wiki User
∙ 13y ago
Epithelial Tissue
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoepithelial
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Why is the plasma membrane called the selectively permeable membrane?
Let trans-membrane transport of molecules be either passive, or facilitated, or active: the plasma [bi-lipid layer] membrane has the power to exclude molecules It selects from passage through the Membrane into the Cell's interior.
What happens to particles when solid dissolves?
they separate into either molecules or ions.
Why are acids so powerful?
Because of their action upon other materials. An acids molecules have a tendancy to either disolve or mix with other molecules.
What is the function of cell membrane in a cell?
The function of the cell membrane is not just something that simply controls something. It is more like a barrier that only allows certain molecules inside through certain means. Its through the phospholipid bilayer that smaller molecules which are non-polar can pass through (since the lipid tail are hydrophobic). Other molecules especially the ones that are too big like waste and large sugar compounds must go through carrier proteins, or more technical, transmembrane proteins. It is through either facilitate (passive) transport and active transport that these molecules are allowed to pass through. In short it acts like a bouncer, letting only certain things in. But this analogy is very shallow.
How are glucose molecules moved Ino a cell?
The glucose goes in through the membrane and can in or out either ways.
What drives diffusion?
Diffusion is the movement of ions and other micro molecules across a barrier or membrane. Diffusion is caused by gradients on either side of the membrane.
What is factual passage?
A factual passage is a passage which has facts in it either you have to write a factual passage or use it as comprehension
Can be either small molecules or large molecules.?
carbohydrates
What controls which substances go in and out of cells?
Molecules in the cell membrane (plasma membrane) control which substances move or out of a cell.Phospholipids form a barrier to most compounds. To move through the phospholipid bilayer, molecules must be small and uncharged; examples are water, dissolved oxygen, and carbon dioxide. These move through the bilayer by diffusion(osmosis in the case of water).Other compounds must pass through proteins embedded in the phospholipid bilayer.Channel proteins allow the passage of molecules that are small enough and are not repelled by any charge around the pore (channel) of the protein. The movement of substances through channel proteins is called facilitated diffusion, being facilitated by the protein.Carrier proteins are highly selective, and move substances either by facilitated diffusion or by active transport, which requires energy. This energy may be supplied by the hydrolysis of ATP.
What explains the word passage best?
A passage can refer to a section of text from a book or a physical route or way through a place. It can also mean the act of moving through a space or the process of time passing.
What controls the chemical reactions in the body?
I think its either proteins or enzymes
Why is the plasma membrane called the selectively permeable membrane?
Let trans-membrane transport of molecules be either passive, or facilitated, or active: the plasma [bi-lipid layer] membrane has the power to exclude molecules It selects from passage through the Membrane into the Cell's interior.
What are located on either side of the uterus and serve as a passage way to the uterus?
Fallopian tubes are located on either side of the uterus.
When one party controls the presidency, and another party controls either one or both houses of Congress, the United States has a ______ government?
divided
What controls the skeletal and smooth muscles by telling them to either contract or relax?
CNS
What are two things a wave can do when it encounters a barrier?
Hello, Well, When something hits a barrier it can either go through it or bounce off. Like a bullet. When you fire a bullet at a wall, if the wall is soft it would pass through and if it is too strong, the bullet would ricochet off the wall. For waves, they either pass into the barrier using the barrier as a medium or bounce off. Remember that when some waves that hit the barrier transfer, there would be always some who 'bounce back' The words I use are not entirely scientifically correct but you get the idea. Hope I Helped
What happens to particles when solid dissolves?
they separate into either molecules or ions.
