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The plasma membrane is made up of a lipid bilayer and some proteins. The transmembrane proteins are the structures which are involved in the transport of molecules in or through the cell.

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Q: What is a holes in plasma membrane through which molecules pass across capillary wall?
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Related questions

How do carriers proteins facilitate passive transport of molecules across a membrane?

Carrier proteins facilitate passive transport of molecules across a membrane by changing its shape, by using ATP, to allow a substance to pass through the membrane.


What method carries molecules and pump molecules or form channels through which specific molecules pass across the plasma membrane?

Transport mechanisms


What kinds of molecules freely diffuse across a semipermeable membrane?

Water molecules freely diffuse across a semipermeable membrane.


Why are Polar molecules unable to go across unless?

they pass through channels in the cell membrane.


What explains why oxygen molecules diffuse across a cell membrane while glucose molecules do not?

Glucose is too big to pass through.


In fact polar molecules are unable to go across unless?

they pass through channels in the cell membrane


Which process describes the pushing of water across the capillary (blood vessel) membrane?

Osmosis


When molecules are moving back and forth across the membrane will they ever stop moving?

Yes, in an isotonic solution the movement of molecules across the membrane will stop.


What is the process When proteins help molecules move across the membrane is called?

when proteins help molecules move across the membrane, it it called Facilitated Diffusion


How is diffusion used when cells remove carbon dioxide?

Carbon dioxide moves out of the cells from a higher to lower concentration across the cell membrane. Then the CO2 moves through the capillary wall across the diffusion gradient. The diffusion process is repeated at the capillary/alveolar junction.


What substance is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?

Lipid-soluble molecules such as O2 and CO2 diffuse freely through the plasma membrane.


What helps molecules diffuse across membrane through transport proteins?

A process known as passive transport helps molecules to diffuse across a membrane. Passive transport does not involve the use of chemical energy, unlike active transport does.