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Sloan [31]
3 years ago
6

Explain the process by which an attack of hay fever follows exposure to pollen

Biology
1 answer:
Bezzdna [24]3 years ago
4 0

<span>Hay fever is a manifestation of allergic reaction from pollen, which is prevalent during haying season. Hay fever is commonly known as allergic rhinitis caused by an oversensitive immune system, particularly the lymphocytes, leading to a misdirected immune response. The body undergo a sensitization when one develops IgE antibodies and develop a strong TH2 response against pollen. Then, this newly develop IgE antibodies sticks to basophils and mast cells with no signs and symptoms yet. However, when one is expose again to pollens, mast cells will be activated and release mediators who are responsible for immediate vascular and smooth muscle reaction. After this, local clinical manifestation of hay fever will be observed. </span>

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Answer:

false

Explanation:

7 0
3 years ago
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Which of the following is not true about density?
ozzi

Answer:

I THINK THE ANSWER IS... A

Explanation:

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Samples as small as a few skin cells can potentially contain DNA. T/F
Travka [436]

<u>Answer</u>: True

<u>Explanation</u>:

  • DNA (Deoxyribonucleic acid) is the genetic material present inside the nucleus of all eukaryotic cells.
  • Samples as small as few skin cells also contain DNA and the presence of DNA in skin cells is often used to identify the DNA of a person in a crime scene.
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8 0
3 years ago
Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell memb
aniked [119]

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In order to perform certain cellular processes, cells need to move substances from their surroundings into the cell across their cell membrane. Moving this substances against the concentration gradient between the cell membrane and its extracellular fluid requires energy (ATP).

An example is the sodium-pottasium pump employed by animal cells in which they expend energy to move K+ molecules into the cell and Na+ molecules outside the cell against the concentration gradient of their cell membrane and extracellular solution.

5 0
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I believe that it is producer, herbivore, carnivore, decomposer Thanks for posting your questions on Brainly

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