Why do scraped knees and insect bites become red painful or itchy

2 answers:

5 0

When we feel pain, such as when we touch a hot stove, sensory receptors in our skin send a message via nerve fibres (A-delta fibres and C fibres) to the spinal cord and brainstem and then onto the brain where the sensation of pain is registered, the information is processed and the pain is perceived.

Sophie [7]3 years ago

4 0

When knee is scrapped and wound is acquired, insects bites to create a insicion on the skin. The blood capillaries of that part if the bodies get distorted in shape or even get damaged. So there is a reaction of immune system by sending much blood at that wound which introduces antibodies so reaction of antibodies with antigens causes allergic reaction.

Reddening and experience of pain during insects bite or injury are classical signs of a complex immunological process called inflammation. This is a mechanism by which the body tries to curtail infection and simultaneously promote tissue repair.

You might be interested in

What does the immune system monitor continuously to ensure the protection of the body?

natulia [17]

The immune system monitor continuously the lymphocyte cell levels in order to ensure the protection of the body. These cells are a type of white blood cells that are important in determining the specificity of the response of the body to foreign substances and infectious microorganisms. This group of cells include the T cells, B cells and the natural killer cells. These are produced in the bone marrow and are transported to the lymphatic systems like the thymus, spleen and the lymph nodes. The NK cells function in cytotoxic innate immunity or the cell-mediated ones. T-cells would function by connecting to virus antigens on the outside of a cell that is infected while B-cells would connect to the virus directly in its surface.

8 0

3 years ago

What do you think would be the best method of submitting evidence to a crime lab?

Nadya [2.5K]

The best method of submitting evidence to a crime lab would be through personal delivery. Thismethod would ensure that the package doesn’t mixed up or contaminated while beingtransported. Personal delivery is also better than mail shipment because with personal delivery<span>the investigators know that the evidence will not get lost or stolen</span>

4 0

4 years ago

Read 2 more answers

Where must an mRNA attach before protein production can begin?

kap26 [50]

Answer:

to a Ribosome

Explanation:

mRNA is produced inside the nucleus of a cell according to the genetic information present in the DNA of the cell. this process is known as Transcription.

Then it's sent to ribosomal subunits in the cytosol through nucleopores. then it attaches to the ribosome. the ribosome reads the nitrogenous base sequence and pairs the tRNAs with complementary nitrogenous bases. <u>(your answer is here, but if you want to know more, continue reading it.)</u>

Each tRNA contains a tri-nucleotide that is collectively known as an anticodon which has the complementary bases of the relevant codon on the mRNA.

Each tRNA has captured a protein. the type of protein is determined by the sequence of the anticodon.

It means two tRNAs with two different anticodons cannot bring the same protein to the ribosome.

the Ribosome separates the proteins attached to tRNAs and links them as a chain.

the final result is a polypeptide chain. I explained to you the basic protein synthetic process.

image credit: Wikipedia

3 0

3 years ago

Which of the following plants is classified as decorative foliage?

romanna [79]

Star-of-Bethlehem is

5 0

4 years ago

The average adult has approximately ___________ of blood in his or her vascular system.

SVEN [57.7K]

There is approx 4.7-5.5 liters of blood in his or her vascular system.

5 0

3 years ago