1. Transitional epithelium is actually stratified squamous epithelium with speci
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Question
1. Transitional epithelium is actually stratified squamous epithelium with special characteristics. How does it differ structurally from other stratified squamous epithelia? How does the structural difference support its function ? 2. How do the endocrine and exocrine glands differ in structure and function ? 3. How are the functions of connective tissue reflected in its structure? 4. In what ways are neurons similar to other cells ?1. Transitional epithelium is actually stratified squamous epithelium with special characteristics. How does it differ structurally from other stratified squamous epithelia? How does the structural difference support its function ? 2. How do the endocrine and exocrine glands differ in structure and function ? 3. How are the functions of connective tissue reflected in its structure? 4. In what ways are neurons similar to other cells ?
1. Transitional epithelium is actually stratified squamous epithelium with special characteristics. How does it differ structurally from other stratified squamous epithelia? How does the structural difference support its function ? 2. How do the endocrine and exocrine glands differ in structure and function ? 3. How are the functions of connective tissue reflected in its structure? 4. In what ways are neurons similar to other cells ?
How does it differ structurally from other stratified squamous epithelia? How does the structural difference support its function ? 2. How do the endocrine and exocrine glands differ in structure and function ? 3. How are the functions of connective tissue reflected in its structure? 4. In what ways are neurons similar to other cells ?
Explanation / Answer
Ans.1.Special characteristics of transitional epithelium:- As the name indicate " transition" the cell are between cuboidal and squamous epithelium.
It is the only tissue in which basement membrane is absent. So its innermost layer directly lie upon the connective tissue. It has 4- 6 layers of cell. Inner most layer of cell is cube like cells.
Middle layer are composed of pear shaped or umbrella shaped cells.
The shape of surface layer changes depending upon the degree of strech . When it is not streched all cell were large and round. But when they are streched the cells becomes flatter.
Cuticle is also present at outer surface which makes it water proof. Cells of this tissue are interconnected by interdigitation.
Function of transitional epithelium:-
1. As the cells of this tissue can contract and expand as the organ needed. These cells strechs readily in order to accomodate fluctuation of volume of the liquid in an organ as in urethra . So the are mostly present in the renal pelvis, urinary bladder, the ureters and the ejaculatory ducts.
2. It also function as a barrier because the cells of this tissue are held tightly betwwen the lumen or inside the hollow space of the tract it lines and the blood stream.
3. It prevents the reabsorption of the toxic waste and pathogen from the bloodstream.
Ans.2.Structural difference between endocrine and exocrine gland:- The basic structural difference between the 2 gland is that the exocrine gland bears ducts to release their secretion and their secretions are directly release at the target organ. These glands are also called as the duct bearing gland. For example ;- salivary gland and sweat gland etc. On the other hand , endocrine gland release their secretion called as hormone in the blood stream from where they are taken ip by the target organ. So these gland are called as the ductless gland.
Functional Difference:- The endocrine gland secretes the hormone also called as the chemical messenger in the blood stream from where they are taken up by the target organ. The exocrine gland secrete the substance called as the enzymes.
Ans . 3.The function of the connective tissue is to support the body , transport of substances across the body, movement of the body part, protection of the body and many other function . The function of the connective tissue reflects its structure. As the connective tissue supports the body so the are very strong and very elastic also such as bones and cartilage. As connective tissue are responsible for the transport of nutrient and oxygen , the blood is good for this purpose. For the movement of body , bone make the good framework and for the muscle contraction connective tissue are important. For movement of body parts ligament and 5endon plays important roles.They are also supportive and protective in functions. They are made up of aboundened non living matrix. They are most durable type and anchor and package body organ. So the are the real building block of body.
Ans.4 Like the othe cells of body ,neuron cells has a cell membrane for its protection. It also has a nucleus which contains many gene and DNA .It also has cytoplasm mitochondria and other orgenelle found in other cells. They also carry out the energy production production and also carry out the protien synthesis lije other cells. They also simmilar in requirement such as blood supply in order to obtain oxygen and nutrients.
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