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3 years ago

Which of the following describes tight junctions?

Biology

2 answers:

Cerrena [4.2K]3 years ago

5 0

A. Cell junctions in areas are subjected to great mechanical stress, such as the skin and heart muscles

stiks02 [169]3 years ago

3 0

Answer:

Junctions among epithelial cells lining the digestive tract. (Ans. B)

Explanation:

Tight junction are defined as a barrier is form where the membrane of two adjacent cells join together. Cell membrane of two adjacent cells connected by two main proteins claudins and occludins (trans-membrane proteins).

Tight junction helping to prevent molecules to passing between the cells and helping to maintain the polarity present in the cell with the help of bind cells together.

Tight junction have several functions:

1) Tight junction are present in the epithelial cells, these cells lines the body cavity and the surface which is present in the body. They are helping to separate epithelial cells from the nearby environment and also helping to separate from the surface which is present in the body.

2) Most important function of the tight junction is to help in forming a barrier which prevent molecules from moving around.

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Indicate whether each of the following descriptions is true of microtubules (MT), microfilaments (MF), intermediate filaments (I

qwelly [4]

Answer:

(a) Microfilaments

(b) Microtubules

(d) Microfilaments

(e) Intermediate filaments

(f) Microfilaments, intermediate filaments, microtubules

(g) Microfilaments, microtubules

(h) Microfilaments, intermediate filaments, microtubules

(i) Microtubules, microfilaments

(j) Microtubules

Explanation:

Microtubules (MTs) are dimers of the protein tubulin (alpha- and beta-tubulin subunits) and they are major components of the cytoskeleton. MTs play diverse cellular roles including, mechanical support (cytoskeleton), transport, motility, chromosome segregation, etc. Microfilaments (MFs) are protein filaments that also form part of the cytoskeleton in eukaryotic cells. MFs consist of G-actin monomers assembled in linear actin polymers, and their functions include mechanical support, cytokinesis, changes in cell shape, amoeboid movement, endocytosis and exocytosis, etc. MFs associate with the protein myosin to generate muscle contractions. Actin filaments/MTs assembly from monomeric actin/tubulin is caused due to energy expenditure, where ATP/GTP bound to actin/tubulin is hydrolyzed during polymerization. Finally, intermediate filaments (IFs) are a type of cytoskeletal element composed of a heterogeneous group of structural elements, and they are not found in all eukaryotes. The primary function of the IFs is to contribute to the mechanical support for the plasma membrane where these filaments come into contact with other cells and/or with the extracellular matrix. The IFs are not directly involved in cell movement. All 3 types of cytoskeletal elements (microfilaments, intermediate filaments, microtubules) can be visualized by fluorescence microscopy when cells express chimeric MT/IF/MF.–GFP fusion proteins.

8 0

3 years ago

Does the rabbit have any of these traits? Dorsal nerve cord

Kisachek [45]

A rabbit has these traits

1) Placenta
2) dorsal nerve cord
3) notochord
4) amniotic sac
5) mammary glands
6) paired appendages
7) Vertebral column
8) placenta

They DO Not have
Short canine teeth

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3 years ago

Final Practice: Read each statement. If the statement is true, write “T”. If the statement is false, write “F”.

gavmur [86]

Answer:

F, i just guessed because I do not see the statements

Explanation:

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3 years ago

Which is not an accurate classification of the python A. Invasive B. Native C. Introduced

lara31 [8.8K]

Answer:

Explanation: hope this helps

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4 years ago

Outcome of pancreaticoduodenectomy with pylorus preservation or with antrectomy in the treatment of chronic pancreatitis

Lyrx [107]

Outcome of pancreaticoduodenectomy procedure -

Compared to the Whipple surgery, PPPD causes more instances of postoperative delayed stomach emptying.
Both procedures result in comparable long-term nutritional benefits, only a small percentage of patients develop new insulin dependent, and 65% of chosen individuals experience an equivalent level of pain reduction.
Patients who have excessive pathology in the head of the pancreas are more likely to get effective pain reduction.

What is pancreaticoduodenectomy procedure?

A Whipple procedure also known as a pancreaticoduodenectomy is a complex operation to remove the head of the pancreas, the first part of the small intestine (duodenum), the gallbladder and the bile duct.
The Whipple procedure is used to treat tumors and other disorders of the pancreas, intestine and bile duct.

Learn more about Whipple surgery

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2 years ago