The human eye can only perceive a small section of the electromagnetic spectrum. We call this section "VISIBLE LIGHT". Different colours across the spectrum correspond to different WAVELENGTHS of light.
Our eyes contain cells called CONES, which are sensitive to these different types of wavelength and allow us to see in COLOUR. Three different types of cone are affected by light in the RED, GREEN AND BLUE parts of the spectrum. These correspond to the PRIMARY COLOURS. Different light sources give out different parts of the spectrum, which appear as different colours. When combined, coloured lights appear as different colours. This is called the ADDITIVE PROCESS. Adding primary light sources in the correct proportions can produce the sensation of other colours in our eyes.
When light hits a pigment in an object, only some colours are reflected. Which colours are REFLECTED and which are ABSORBED depends on the pigment. This is the SUBTRACTIVE PROCESS. Looking at a coloured object in coloured light may make it appear different. This is because pigments can ONLY reflect colours that are PRESENT in the oncoming light.
Many thanks, much love, ADAM! :-) X
Monday 13 August 2012
Sunday 12 August 2012
A bit about Kidneys!
The kidneys serve two major functions:
they keep the salt content of the blood constant, and they filter waste out of the bloodstream.
So, the main components of urine are (salt) water and waste products. The major waste product from cells in the body is ammonia, and the major waste product from blood is a broken form of heme called bilirubin. In the liver, each of these is converted into a less hazardous form: ammonia is converted to urea, and bilirubin is degraded to urobilins. Salt, water, and urea are all colorless, but urobilins (which come from degraded pigments) are yellow.
So, if you drink a lot, your urine will be more dilute and clearer, and if you get dehydrated, your urine will contain less water and be darker yellow.
they keep the salt content of the blood constant, and they filter waste out of the bloodstream.
So, the main components of urine are (salt) water and waste products. The major waste product from cells in the body is ammonia, and the major waste product from blood is a broken form of heme called bilirubin. In the liver, each of these is converted into a less hazardous form: ammonia is converted to urea, and bilirubin is degraded to urobilins. Salt, water, and urea are all colorless, but urobilins (which come from degraded pigments) are yellow.
So, if you drink a lot, your urine will be more dilute and clearer, and if you get dehydrated, your urine will contain less water and be darker yellow.
Saturday 11 August 2012
Drugs!!
Not the dodgy kind you can buy!!
A drug is designed to either prevent or cause something to happen in your body.
Every cell of your body has RECEPTORS on its surface. These RECEPTORS receive chemicals that transmit a message to the cell.
Your body is full of chemicals, in fact, it is jam-packed with them. Your cells are constantly receiving chemical messengers.
Sometimes, you don't want the message to get there or you want a different message to be received instead - this is where DRUGS come in to it.
A drug is technically a chemical that intervenes and changes things.
A drug may help your body deliver more of the same message to a cell or it can lodge itself in a cell receptor to stop the message being received by the cell.
Random fact: the Greek doctor Hippocrates used willow bark as long ago as 400BC to relieve the pain of his patients.
Wounds can become infected with harmful bacteria if an antiseptic is not applied to kill them. Antiseptics are able to kill bacteria in many ways. The alcohol rubbed onto your skin before an injection kills bacteria by breaking up the protein that makes up their cells.
There are 2 main ways in which antibiotics work. One type prevents the bacteria from making its cell walls. Another type interferes with the chemical activities in the cells of bacteria.
Anaesthetic drugs are designed to stop the brain from receiving messages of pain.
Antiviral drugs work by blocking the chemicals the virus needs to reproduce.
Drugs go vigorous testing that can span 8 years.
A drug is designed to either prevent or cause something to happen in your body.
Every cell of your body has RECEPTORS on its surface. These RECEPTORS receive chemicals that transmit a message to the cell.
Your body is full of chemicals, in fact, it is jam-packed with them. Your cells are constantly receiving chemical messengers.
Sometimes, you don't want the message to get there or you want a different message to be received instead - this is where DRUGS come in to it.
A drug is technically a chemical that intervenes and changes things.
A drug may help your body deliver more of the same message to a cell or it can lodge itself in a cell receptor to stop the message being received by the cell.
Random fact: the Greek doctor Hippocrates used willow bark as long ago as 400BC to relieve the pain of his patients.
Wounds can become infected with harmful bacteria if an antiseptic is not applied to kill them. Antiseptics are able to kill bacteria in many ways. The alcohol rubbed onto your skin before an injection kills bacteria by breaking up the protein that makes up their cells.
There are 2 main ways in which antibiotics work. One type prevents the bacteria from making its cell walls. Another type interferes with the chemical activities in the cells of bacteria.
Anaesthetic drugs are designed to stop the brain from receiving messages of pain.
Antiviral drugs work by blocking the chemicals the virus needs to reproduce.
Drugs go vigorous testing that can span 8 years.
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