Why Does It Itch When A Wound Heals?

Itching, as stated in the previous post, is caused by the release of a substance known as histamine that stimulates the nerve endings. When tissues become inflamed due to the invasion of bacteria or by trauma such as heat, chemicals or a cut, histamine is released from the cells to the tissues. And, since histamine is a powerful vasodilator, it increases blood flow and the permeability of the blood capillaries in the vicinity of the wound. Apart from this a number white blood cells known as basophils increases during healing. Basophils contains a huge amount of histamine which diffuses into the nearby skin and stimulates the nerve endings, which in turn, leads to itching.

How Does Scratching Stop Itching?

When our cells get damaged itching results. Due to this small damage substances such as histamine (the amine that plays a role in allergic phenomena and the widening of blood vessels) are freed and which irritates the nerves and fibers in the skin. This irritation sends signals similar to pain to the central nervous system. There is a similarity between telephone lines and a switchboard. The function of a switchboard is to route incoming calls and to ensure that only one line at a time is connected to a particular numbered telephone. This effectively blocks the telephone from other incoming calls. Similarly, the itch signal can be blocked by occupying the central nervous system by another incoming message like the sensation of scratching, which is less irritating.

What Does "Schedule H Drug" Indicate?

The Drugs and Cosmetic Act and Rules (D&C Act) covers the manufacture and sales of all drugs. One of the schedules of the D&C Act rules is the Schedule H.This schedule includes the prescription of drugs under rules 96 and 97.

Rule 96 requires that a conspicuous red vertical line is printed on the left side running throughout the body of the label of the innermost container and the other covering of the container in which the drug is packed.

Rule 97 deals with the labeling of the medicines. If it contains a Schedule drug then the symbol Rx should be conspicuously displayed and the warning "Schedule H Drug" to be sold only on the prescription of a medical practitioner should also be printed in the container.

Schedule H drugs include a huge list of medicine which commonly include narcotic drugs, ranitidine, mabandazole, ibuprofen, diazepam and some anti-biotics.

What Is The Function Of An Incubator?

An incubator functions to sustain the life of a prematurely born baby who generally weigh less than a kilogram at birth. The incubator provides an ideal life environment by keeping it sterile, controlling temperature, relative humidity and more oxygen content (up to 40% - twice the normal content of normal air).

The incubator is a special air-conditioned chamber with a climate control system of its own that is built into it. A motor that is built in draws air from the outside and it is freed from germs through a filter for bacteria which then flows through a heating system that is thermostatically controlled and a water evaporator. Oxygen is added in it if found to be required. A slight extra pressure is maintained in the incubator, that sees to it that the air flow is always directed inwards and the carbon-dioxide that is exhaled is carried away.

Usually, the baby that is born prematurely is kept in an incubator for the first few weeks of its life and all manipulations regarding nursing is done through special holes which are provided with devices that seal and fit closely around the arm of the nursing attendant. Th baby is fed, weighed, cleaned and treated medically all inside the incubator. Even minor operations can be carried out inside the incubator.

The incubator is equipped with a number of safety devices that monitor electric failure, oxygen or water supply and the temperature and a warning sound is sounded to alert the nursing attendant.

On the whole an incubator keeps a prematurely born live through its first few weeks of its precious life.

Where Does Dust Come From?

Dust consists mostly of abraded fragments form larger objects. The things that turn into dust can be almost anything from cabbages (fragments of dried vegetable matter) to kings (especially if cremated). Dust is so powerful that the wind driven ones have cut fantastic shapes on the canyons and badlands of America over millions of years. There are no borders for dust and can appear any where.
The reason why dust keeps reappearing is that the dust cloth used for dusting simply stirs up the dust temporarily and the fall back and fresh dust keeps coming in all of the time.

Why Do We Dream?

Dreams have fascinated philosopher for a long time. They are an involuntary series of visual or auditory imagery that occur during Repaid Eye Movement (REM) sleep. Dreaming occurs some five or six times at night among adults. They are in response to the activities that we unconsciously wish to do during our waking hours and according to Sigmund Freud is the gratification of some drive or desire for the fulfillment of a subconscious wish. Many people remember what they dream about and quite a lot forget what they dreamed about. The people that appear in a dream are almost always some one that the dreamer has known in real life.