– ANTISEPTICS –
An antiseptic is a substance which destroys bacteria or keeps them from increasing. Today, many types of antiseptics such as alcohol, iodine, iodoform and formalin are manufactured and used quite commonly. In addition to these manufactured antiseptics, the body itself has certain ways in which it defends itself against bacteria or germs.
Tears, sweat, saliva (the fluid in the mouth) and blood contain substances which resist common infections. The greatest of nature’s antiseptics are the white corpuscles in the blood, which are called phagocytes. These have the important quality of being able to consume harmful bacteria that enter the blood stream or infect a part of the body.
When such bacteria are present in the body, the phagocytes rush to the infected spot and devour the invaders. The phagocytes are usually strong enough to destroy the bacteria unless the latter increases in number too quickly. In the same way that bacteria attack human beings and cause infections, so they attack meat and vegetables and other food, making them go bad.
Bacteria need favourable conditions to grow. These include moisture, and a fairly warm atmosphere. Thus, meat which has to be kept for a long time is frozen, and this makes it too cold for bacteria to grow until it is thawed out again.
(This article about antiseptic was written in 1990’s)
A. What do the following refer to?
1. ‘the latter* (line 14):
2. ‘they’ (line 16):
B. Mark the best choice.
1. Line 7, ‘resist’ probably means . a) cause b) fight against c) defend d) increase
2. Line 12, ‘devour’ probably means to . a) enter b) infect c) consume d) rush
3. Line 12, ‘the invaders’ are probably the a) phagocytes b) bacteria c) infected spots d) human beings
4. Line 20, ‘thawed out’ is the opposite of . a) cold . b) moist c) fairly warm d) frozen
(If you like www.newsky24.com please share on social links 🙂 )