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Where is the epithelial tissue found in our bodies?
3 classes1. simple endoderm1 layer, few think upper layers dermisa. squamousb. cuboidalc. columman2. stratified ectodermmany layers thika. squamousb. columman3. gland endodermdistirctdig. gland (cottage cheese)-globular: not uniform in textureEpithelial is one of the four types of tissues in the body. There is also muscular, nervous, and connective tissues. The best way to describe epithelial tissues is that they occur in parts of the body that need protection from the external environment. An analogy would the be the tiles on the space shuttle.3 classes1. simple endoderm1 layer, few think upper layers dermisa. squamousb. cuboidalc. columman2. stratified ectodermmany layers thika. squamousb. columman3. gland endodermdistirctdig. gland (cottage cheese)-globular: not uniform in texture1- non penetrable to vessels 2- penetrated by nerves 3- lines cavities and surfaces 4- lie on basement membrane 5 compacted cells with little inter-cellular space.Characteristics of epithelial tissue: Epithelial tissue lies on a basement membrane. That means that underlying the cells that are the cellular component of the epithelial tissue, there is a layer of acellular ("a-" means not, so "acellular" means not cellular) material. This basement membrane can be thought of as a sticky layer to keep the epithelial cells attached to whatever underlies them. The bottom edge of the epithelial tissue abuts the basement membrane; this bottom edge is called the basal surface. The edge of the epithelial tissue that faces the lumen (or the outside world) is called the apical surface.Other characteristics:1. Cells within this tissue readily divide to make more cells. This helps this tissue recover after any sort of abrasions occur.2. This tissue does not have any vasculature. This means that there are no blood vessels within it. This should make sense, since epithelial tissue is likely to get damaged by material moving against it-- and you don't want to bleed everytime something bangs into your skin or everytime you swallow something rough.3. The cells within this tissue are firmly attached to each other. As a border-tissue, if the cells weren't adherent to one another, it would be a leaky border. This would be no good-- liquids from inside of us would drip out! Yuck! So the cells all make the type of junctions with each other called tight junctions.
How is the function of epithelium reflected in its structure?
Since epithelium needs to serve as both a barrier and selectively permeable membrane, the cells need to be tightly junctioned to one another (thus prohibiting paracellular transport) and need to express channels, transporters or exchangers to allow for movement of selected ions/molecules across the epithelial barrier
Does plant cells need a cell membrane?
Yes plant cells need a cell membrane. In addition to the cell membrane they also have a cell wall. Animal cells however do not have a cell wall but merely a membrane. A cell is not able to live without a membrane as it holds the organelles and cytoplasm in place.
Do all cells have a cell membrane?
All cells need a membrane. The membrane helps with keeping in all the fluids and organelles plus it takes in and sends out important things. Plant cells and bacteria have cell walls which give an extra layer of protection.
Despite differences in the size and shape all cells have cytoplasm and a?
cell membrane!!! not ribosomes! -wrong plant cells have cell walls and animal cells have cell membrane, it might seem right but it is wrong. Nearly all cells have a mitochondrion.^ While the answer above is correct, the real answer is Cell Membrane. So all cells have cytoplasm, AND cell membranes.
What is one thing that cells need to function in the cell membrane?
protien
Why do all cells need a cell membrane?
At times, you might need to remove, or clear, all the formatting applied to a cell or range of cells
Is water and everything else the cells need let in by the cytoplasm?
No, by the cell membrane.
What structure do all cells need?
they all need a nucleus (the brain of the cell), a cell membrane and cytoplasm.
What does the cell membrane need to survive?
It will need more cell membrane to cover it but cells only grow a certain size before they will no longer be efficient.
What do cells use absorbed nutrients for?
The nutrients help the cells to mature and grow. They also need these nutrients to create ATP for energy to work.
What generally surrounds animal cells?
A cell membrane. As animals have a skeleton, we do not need a cell wall, like plants.
