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ss7ja [257]
3 years ago
5

Why are tight junctions especially abundant in epitheliel cells? eg in the skin and intestines

Biology
1 answer:
Sunny_sXe [5.5K]3 years ago
3 0
Tight junctions hold the cells together as a rivet would in hardware so it can't be taken apart. This makes it so skin and intestines are very strong and don't break very often
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The medulla oblongs ya controls the contraction and relaxation of the blank causing the lungs to inflate and deflate during brea
Dmitry_Shevchenko [17]

Answer:

This question includes some errors, the question should be written as:

The medulla oblongata controls the contraction and relaxation of the ______ causing the lungs to inflate and deflate during breathing.

Although there are no options, the answer is generally RESPIRATORY MUSCLES i.e. diaphragm and intercostal muscles

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The Medulla oblongata located in the hindbrain is one of the two respiratory control centers (the other being the PONS). The medulla sends nerve signals to the muscles responsible for bringing about the ventilation process i.e. the DIAPHRAGM and INTERCOSTAL MUSCLES.

This nerve impulse brings about the contraction of the diaphragm, which is the major respiratory muscle, and intercostal muscle causing the lungs to inflate and allow the entry of oxygen-containing air. On the other hand, it also brings about the relaxation of these muscles causing the lungs to deflate allowing the expelling of air.

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