Nucleus/ Cell - Cell attatchments

Nucleus?

Stores/ organizes DNA and is seperated by Nuclear Envelope

Nuclear Envelope?

regulates what enters the cell/ protects

Nucleolus?

area for ribosome assembly

Tight junctions?

• transmembrane proteins fuse the outer surfaces of cells together which leaves little space between cells, making it leak prook

  • compromised by friction

What makes tight junctions leak proof?

leave little space between cells

What can compromise tight junctions?

friction

Desmosomes?

stronger atattchment that atattches to intermediate filaments of cytoskeleton

• made out of Cadherins and Plaque

What is plaque?

a dense layer of proteins

Cadherins?

transmembrane glycoproteins

What are desmosomes strong/ resistant to?

friction and stress

Where can desmosomes be found?

in the skin/ cardiac muscle

What do Gap junctions do?

electrochemically couple cells

What a connexin?

transmembrane proteins

what are connexons?

fluid filled tunnel formed by ring of connexins

What do connexins and connexons do?

allow movement of ions/ small molecules from one cell to the next

What rapid transmissions do gap junctions do? What specifically?

nerve and muscle impulses, and specifically cardiac and smooth muscle

What do gap junctions diffuse, and for who?

diffuse nutrients and wastes for cells far from a capillary.

• Ex. compact bone, lens, and cornea