Table of Contents
- 1 What type of junction would you expect to find between the cells that make up the stomach wall?
- 2 What is gap junction and tight junction?
- 3 Which type of junction is expected to form between platelets?
- 4 Which type of cell junction would you expect to find anchoring the cells of the epidermis to each other?
- 5 What type of junctions are tight junctions?
- 6 Which of the following types of junctions are responsible for communication between cells?
- 7 How are plasma membranes connected at gap junctions?
- 8 How are adherens junctions of adjacent cells bonded?
What type of junction would you expect to find between the cells that make up the stomach wall?
Tight junctions allow ions, nutrients, and waste products to freely move between cells. Collagen fibers are made up of a protein called collagen, which is one of the rarest protein in the body.
What type of cell junction would you expect to find between muscle cells?
Desmosomes Connect Intermediate Filaments from Cell to Cell The particular type of intermediate filaments attached to the desmosomes depends on the cell type: they are keratin filaments in most epithelial cells, for example, and desmin filaments in heart muscle cells.
What is gap junction and tight junction?
In Summary: Cell Junctions Plasmodesmata are channels between adjacent plant cells, while gap junctions are channels between adjacent animal cells. A tight junction is a watertight seal between two adjacent cells, while a desmosome acts like a spot weld.
Does the heart have tight junctions?
Adherens junctions are involved in a number of critical functions, including providing additional structural support. For example, they hold cardiac muscle cells tightly together as the heart expands and contracts.
Which type of junction is expected to form between platelets?
gap junction
Two hemichannels brought together form a gap junction, a form of intercellular contact that allows for direct transfer of material and signals between the adjacent cells.
Which type of cell junction would you expect to find anchoring the cells of the epidermis?
Review questions 2
| Question | Answer |
|---|---|
| Which type of cell junction would you expect to find anchoring the cells of the epidermis to each other. This types of junction gives the skin the ability to endure stretching and other mechanical stresses without tearing. | Desmosomes |
Which type of cell junction would you expect to find anchoring the cells of the epidermis to each other?
zonula adherens
Epithelial cells are held together by strong anchoring (zonula adherens) junctions. The adherens junction lies below the tight junction (occluding junction). In the gap (about 15-20nm) between the two cells, there is a protein called cadherin – a cell membrane glycoprotein.
What are the 3 types of membrane junctions?
In vertebrates, there are three major types of cell junction:
- Adherens junctions, desmosomes and hemidesmosomes (anchoring junctions)
- Gap junctions (communicating junction)
- Tight junctions (occluding junctions)
What type of junctions are tight junctions?
Tight junctions, also known as occluding junctions or zonulae occludentes (singular, zonula occludens) are multiprotein junctional complexes whose canonical function is to prevent leakage of solutes and water and seals the paracellular pathway.
What forms tight junctions between cells?
Structure of Tight Junctions Tight junctions are a branching network of protein strands on the surface of a cell that link with each other throughout the surface of the membrane. The strands are formed by transmembrane proteins on the surfaces of the cell membranes that are adjacent to each other.
Which of the following types of junctions are responsible for communication between cells?
Communicating junctions, or gap junctions allow for direct chemical communication between adjacent cellular cytoplasm through diffusion without contact with the extracellular fluid. This is possible due to six connexin proteins interacting to form a cylinder with a pore in the centre called a connexon.
What Junction allows for communication between cells?
Gap junctions
Gap junctions are involved in cellular communication — not just in epithelial tissue, but in other tissue types as well. Gap junctions are specialized connections that form a narrow pore between adjacent cells. These pores permit small molecules and ions to move from one cell to another.
How are plasma membranes connected at gap junctions?
At gap junctions the adjacent plasma membranes are very close, and the cells are connected by hollow cylinders called connexons, composed of transmembrane proteins. The many different types of connexon proteins vary the selectivity of the gap junction channels.
How are the different types of cell junctions formed?
Special cell junctions form. Let’s take a closer look at the different types of cell junctions. In a tight junction, a series of integral protein molecules in the plasma membranes of adjacent cells fuse together, forming an impermeable junction that encircles the cell.
How are adherens junctions of adjacent cells bonded?
The extracellular portions of the cadherin molecules of adjacent cells are bonded together by calcium ions (or another protein in some cases). This means that the functional as well as morphological integrity of the adherens junctions are calcium dependent.
How are cells held together in the plasma membrane?
On the cytoplasmic face of each plasma membrane is a thickening called a plaque. Adjacent cells are held together by thin linker protein filaments that extend from the plaques and fit together like the teeth of a zipper in the intercellular space.