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"The cell membrane has openings in it."
(PLATO)
"V______________V
What else can I help you with?
What is it called when a part of a cell membrane closes around a molecule to allow the molecule to enter the cell?
This is called endocytosis.
What tissue makes up the lymphatic capillaries?
The lymphatic capillaries are made up of endothelial cells, which are thin-walled cells that line the inside of the vessels. These cells have small openings that allow fluid and molecules to enter the capillaries.
Cell membranes usually allow what substances to enter a cell?
Cell membranes usually allow water, gases (such as oxygen and carbon dioxide), and small uncharged molecules to enter a cell. Larger molecules or charged ions may require specific transport proteins or channels to cross the membrane.
Why hapten is not immunogenic?
Because the molecule is too small to cross-link with immune-cells
What are the small openings on a leaf that allow gasses to leave and enter the plant'?
It is controlled by a combination of the pressures/concentration gradients of the gases involved, and the guard cells of the stomata.
Does tissue fluid contain glucose?
I read somewhere that it does not. perhaps because all of it is used up by the body cells.
How do water molecules and small ions enter cells?
Some water molecules and small ions ( depending on charge, other ions need passive or active transport ) can diffuse across the cell's membrane and there are channels called porins that facilitate water molecule passage into the cell.
What is the whole between two guard cells in a leaf called?
It's called a stoma (plural stomata) and its function is to allow carbon dioxide to enter the leaf for photosynthesis. The guard cells sre responsible for regulating the size of the stoma.
How does a cell allow small molecules enter and exit?
"The cell membrane has openings in it." (PLATO) (:
What does a microscope allow you to see?
it allows you to see small things like cells
How does nutrients enter your blood stream?
through cells in the villi of the small intestine
What are the special structures in the cell membrane that allow water and sugar pass through it made of?
These special structures are called protein gates or protein channels. Water is able to diffuse through the cell membrane since it is a small molecule. However, there are channels called aquaporins that allow water to enter the cell. A glucose molecule cannot just diffuse into a cell. There are glucose channels on the surface of the cell membrane that bind glucose molecules and allow them to enter the cell.
