we feel an itch on our arm. it might be a mosuito bite . our other hand rushes to scratch your arm . how our nervous system makes us do this ?
A mosquito does not just suck your blood, they also inject their own saliva when they bite you. This thins your blood and makes the blood easier for them to access your veins. This saliva remains in our body after the bite and our immune system acts to promptly neutralize it. After the bite your body responds to the saliva left behind and antibodies are produced to bind to the salvias antigens and neutralize the invasion of foreign cells. In this self defense war, histamine is produced to help your cells fight the invasion. Histamine works by swelling up your cells and creating a barrier that contains the invaders.
On the surface this fight creates an inflamed area around the bite and hence the bump appears. This surface disturbance triggers your brain to send an itch signal to the bite( the same way it triggers a normal scratch). Just like in a normal itch your brain cancels the pain and makes it feel good, however this does not solve the problem and you are soon sent a scratch signal to the same bite again. This loop continues as your brain keeps sensing the need to itch. Essentially one part of your brain is glitching out and telling you to keep scratching until your skin is perfect.
so for the protection of our skin the signal goes to our brain and says to scratch an itch by the another hand
the another analysis is
Though we commonly call them mosquito bites, it is not really biting you at all. The mosquito pierces the upper layer of your skin with her proboscis, a straw-like mouthpart that allows her to drink fluids.
Once she breaks through your epidermis, the mosquito uses her proboscis to search for a pumping blood vessel in the dermal layer underneath.
When the mosquito locates a good vessel, she releases some of her saliva into the wound. Mosquito saliva contains anti-coagulants that keeps your blood flowing until she is finished with her meal.
Now your immune system realizes something is going on, and springs into action. Your plasma cells produce immunoglobulins (antibodies) and send them to the area of the bite. These antibodies cause your mast cells to release histamines to combat the foreign substance. The histamine reaches the area under attack, causing blood vessels there to swell. It's the action of the histamine that causes the red bump, called a wheal.
But what about the itching? When the blood vessels expand, the swelling irritates nerves in the area. You feel this nerve irritation as an itchy sensation.
Recent studies of mosquito bite reactions in mice suggest there may be something else causing the itch. The mast cells may release another non-histamine substance that causes peripheral neurons to send itch signals to the brain.
A mosquito does not just suck your blood, they also inject their own saliva when they bite you. This thins your blood and makes the blood easier for them to access your veins. This saliva remains in our body after the bite and our immune system acts to promptly neutralize it. After the bite your body responds to the saliva left behind and antibodies are produced to bind to the salvias antigens and neutralize the invasion of foreign cells. In this self defense war, histamine is produced to help your cells fight the invasion. Histamine works by swelling up your cells and creating a barrier that contains the invaders.
On the surface this fight creates an inflamed area around the bite and hence the bump appears. This surface disturbance triggers your brain to send an itch signal to the bite( the same way it triggers a normal scratch). Just like in a normal itch your brain cancels the pain and makes it feel good, however this does not solve the problem and you are soon sent a scratch signal to the same bite again. This loop continues as your brain keeps sensing the need to itch. Essentially one part of your brain is glitching out and telling you to keep scratching until your skin is perfect.
so for the protection of our skin the signal goes to our brain and says to scratch an itch by the another hand
the another analysis is
Though we commonly call them mosquito bites, it is not really biting you at all. The mosquito pierces the upper layer of your skin with her proboscis, a straw-like mouthpart that allows her to drink fluids.
Once she breaks through your epidermis, the mosquito uses her proboscis to search for a pumping blood vessel in the dermal layer underneath.
When the mosquito locates a good vessel, she releases some of her saliva into the wound. Mosquito saliva contains anti-coagulants that keeps your blood flowing until she is finished with her meal.
Now your immune system realizes something is going on, and springs into action. Your plasma cells produce immunoglobulins (antibodies) and send them to the area of the bite. These antibodies cause your mast cells to release histamines to combat the foreign substance. The histamine reaches the area under attack, causing blood vessels there to swell. It's the action of the histamine that causes the red bump, called a wheal.
But what about the itching? When the blood vessels expand, the swelling irritates nerves in the area. You feel this nerve irritation as an itchy sensation.
Recent studies of mosquito bite reactions in mice suggest there may be something else causing the itch. The mast cells may release another non-histamine substance that causes peripheral neurons to send itch signals to the brain.
