1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
weeeeeb [17]
3 years ago
9

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

Biology
2 answers:
posledela3 years ago
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
Help me please fast......................,......
Likurg_2 [28]
D. TT x tt. When using a punnett square and substituting with the different genotypes, all of them will be Tt. And since T is the dominant trait, the offspring will be very tall.
7 0
3 years ago
For a scientific theory to be valid, it must allow you to
Cloud [144]

Answer:

Explanation:

That's quite a bit of points. Offer 20 next time (which shows up as 10).

Not all experiments lend themselves to this, but the best ones do. Make predictions. The startling experiments (the best of them) certainly allow you to make predictions

Most of the time, experiments confirm what was originally thought. It is, however, the best answer among this bunch.

A is also possible, but not always. I will stick with D, but I think others will pick A.

4 0
3 years ago
A forest fire destroys an area. A small population of trees and a large population of birds are both affected. Which type
kondor19780726 [428]

Answer:

Density independent is the correct answer

3 0
3 years ago
Some scientists feel that dinosaurs became extinct when a cloud of dust and gas kept sunlight from penetrating the atmosphere fo
Juli2301 [7.4K]

Answer:

Yes, it is a reasonable conclusion.

Explanation:

The long lasting gas that kept sunlight from penetrating the atmosphere was the key factor that promote a disturbance on the chain food. Without sunlight, plants could not produce their own energy, therefore they could not resist to this environment condition and die. That way, the herbivores could not feed and die as well. Also the carnivore could not survive because their supply of food of herbivores are not alive anymore. This scenario would promote a mass extinction of every dinosaur.

4 0
4 years ago
A boxer has been jumping rope for an hour. His leg muscles are burning, and he feels weak. Which substance is the most likely ca
Alika [10]
The lactic acid that is building up in his muscles will eventually cause him to stop exercising. The burning sensation comes from the build up of that lactic acid in his muscles.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Why are identical twins always the same gender?
    13·1 answer
  • The statrum ____________ is a single layer of columnar or high cuboidal cells resting on a basement membrane. the stratum ______
    5·1 answer
  • What skills do you think are necessary to perform a laparoscopic procedure?
    7·1 answer
  • What are two biotic factors that affect life in tropical rainforest
    13·1 answer
  • In the late eighteenth century, a typhoon swept through the Pacific atoll of Pingelap, leaving approximately 20 survivors. A lar
    9·1 answer
  • Which of the following is not a Domain?
    12·2 answers
  • Respond to the following based on your reading
    5·1 answer
  • The blood type of the donor and recipient must be compatible for a blood transfusion to occur. If they two are not compatible, a
    9·1 answer
  • A section of DNA and its corresponding RNA strand have both similarities and differences in
    15·1 answer
  • Long chains of sugar are called?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!