It is very selective about what it allows to pass through.
The term "semi" means partially. The membrane is permeable to some things but not to others.
It moves sideways
It is very selective about what it allows to pass through.
the cell membrane is semipermeable, allowing some substances to pass into the cell blocking others.
allowing some substance to pass into the cell and blocking others
membrane are composed of a lipid bilayer. their hydrophobic tails face the inside of the membrane and their hydrophilic heads face their environment.
It moves sideways. :)
It moves sideways. :)
It moves sideways. :)
It moves sideways
It is very selective about what it allows to pass through.
The membrane moves sidewaysit moves sideways
the cell membrane is semipermeable, allowing some substances to pass into the cell blocking others.
This means that there are more facets to 'trans' membrane molecular movement than {merely} diffusion - which is the simplest. The smallest of molecules pass both ways unimpeded. Medium sized bio-molecules are permitted transit via facilitated diffusion; while the largest and most biologically active bio-molecules are selectively accepted or refused at any of a Myriad of Cell Membrane structures that are known [in short] as Cell Surface Receptors.
This means that there are more facets to 'trans' membrane molecular movement than {merely} diffusion - which is the simplest. The smallest of molecules pass both ways unimpeded. Medium sized bio-molecules are permitted transit via facilitated diffusion; while the largest and most biologically active bio-molecules are selectively accepted or refused at any of a Myriad of Cell Membrane structures that are known [in short] as Cell Surface Receptors.
This means that there are more facets to 'trans' membrane molecular movement than {merely} diffusion - which is the simplest. The smallest of molecules pass both ways unimpeded. Medium sized bio-molecules are permitted transit via facilitated diffusion; while the largest and most biologically active bio-molecules are selectively accepted or refused at any of a Myriad of Cell Membrane structures that are known [in short] as Cell Surface Receptors.
allowing some substance to pass into the cell and blocking others
Cell protector which let's some things in but not all