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Old Sunday, March 15, 2009
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@Tauqeer Kurd & Last Island
Ammeter:an instrument used for measuring electric current in amperes.

voltmeter:an instrument calibrated in volts that measures the electromotive force or potential difference between two points in a circuit.


(iii) Adrenalin is secreted by the Adrenal Medulla


Adrenal Gland, vital endocrine gland that secretes hormones into the bloodstream, situated, in humans, on top of the upper end of each kidney. The two parts of the gland—the inner portion, or medulla, and the outer portion, or cortex—are like separate organs: They are composed of different types of tissue and perform different functions. The adrenal medulla, composed of chromaffin cells, secretes the hormone epinephrine, also called adrenaline, in response to stimulation of the sympathetic nervous system at times of stress. The medulla also secretes the hormone norepinephrine, which plays a role in maintaining normal blood circulation. The hormones of the medulla are called catecholamines. Unlike the adrenal cortex, the medulla can be removed without endangering the life of an individual.

The adrenal outer layer, or cortex, secretes about 30 steroid hormones, but only a few are secreted in significant amounts. Aldosterone, one of the most important hormones, regulates the balance of salt and water in the body. Cortisone and hydrocortisone are necessary to regulate fat, carbohydrate, and protein metabolism. Adrenal sex steroids have a minor influence on the reproductive system. Modified steroids, now produced synthetically, are superior to naturally secreted steroids for treatment of Addison's disease and other disorders.


rgds

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1. Which of the following statements are true and which are false.
a) Bacteria are parasites
b) Ruby is an Oxide of Aluminum
c) In the Australian continent, days are longer than nights in June.
d) Gypsum is hydrated calcium carbonate chemically.
e) Twenty-three moons revolve around Saturn
f) Pluto is the coldest planet
g) Chromite ore contains chromium oxide
h) Mica is a nonconductor of electricity.
i) Sun is the biggest star in the universe.
j) The earth completes one rotation about its axis in 365.25 days.

4. Fill in the blanks
(i) The capacity to do work is called _________.
(ii) The energy possessed by a body die to its position is called _________.
(iii) Kitab al-Manazir is a publication by a famous Muslim scientist about _________.
(iv) _________ usually lies in the centre of an animal cell.
(v) Calcium and _________ are the essential elements of bones.
(vi) Proteins are formed by combination of _________.
(vii) Rainwater dissolves sulphur dioxide to form _________
(viii) The set of instructions given to a computer is called _________.
(ix) Chemicals such as penicillin which set on _________ are called antibiotics.
(x) Comet Shoemaker Levy 9 hit the planet _________ in July this year.


7. Give brief answers for any five of the following
(i) Name the two proteins found in milk.
(ii) What organ of human body controls the amount of water and salt in blood?
(iii) Drugs are classified into five major groups. Define any two.
(iv) How do chromosomes in a male and female (enter) in a human body?
(v) Which two gases do you exhale more than you inhale?
(vi) Name any two glands which secretes hormones in human body

Last edited by Princess Royal; Friday, March 20, 2009 at 12:46 AM.
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