Answer:
The ability of caffeine to inhibit adenosine receptors, plays a very important role in heightened alertness and sleeplessness.
Explanation:
"<em><u>Caffeine</u></em>" (<em>1,3,7-trimethylxanthine</em>) is an alkaloid obtained from plants. It has a chemical formula of C8H10N4O2.
Caffeine is generally <em>hydrophillic</em> but sufficiently <em>lipophilic</em> to pass through all biological membranes and readily cross the blood-brain barrier.
Therefore can bind with the adenosine receptors. Due to the blocking of adenosine inhibitory effects through its receptors held by paraxanthine and caffeine, it indirectly affects the release of <u>norepinephrine, dopamine, acetylcholine, serotonin, glutamate</u> e.t.c.
The release of the above-mentioned hormones have a great impact on the heightened alertness of the body, especially <em>dopamine</em> and <em>serotonin</em>.
Answer:
Osmosis is important in plants and animals because it allows for the absorption of water.
Explanation:
Answer:
The water temperature should be at least 
(
).
Explanation:
Temperature is a measure of the degree of hotness or coldness of a substance. It is measured either Kelvin, in degree Fanrenheit or Celsius. These scales can be converted from one to another.
To ensure appropriate or proper cleaning of table wares, hot water at required temperature is adviseable for use. This is because most germs can not survive under hot condition, thus they die.
Washing with water of at least () temperature in a three compartment sink helps to kill germs on the table ware.
Answer:
Congestive heart failure occurs when the heart cannot distribute enough blood throughout the body to reach the major organs, causing the tissues to swell with fluid.
Explanation:
green chillies
amarnath a type of crops
spinach:good green leaves for growing frequently in uae.
The major vegetable crops, supplying nearly all the country's needs during the season, are tomatoes, cabbage, eggplant..ras al khaimah produces most of the country's vegetables. In addition to dates, the major fruit crops are citrus and mangoes.
