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Tracheae - Respiration
Insects that have successfully colonised the terrestrial environment have evolved a respiratory system very different from other land animals - the tracheal system. Apart from insects other arthropods, such as millipedes, centipedes, a few arachnids and terrestrial crustaceans have tracheae as respiratory organs.
Arteries - Circulation The arteries deliver blood from the heart. Figure shows the structure of arteries and the different layers of the vessel wall. The thick walls of these
Is the upward move of warm air good or bad for the dispersion of pollutants? The upward movement of warm air is a natural method of dispersion of pollutants. The air near the g
What is Class Amphibia ? Class Amphibia takes its name from the Greek words "amphi" and "bios." Amphi means "both sides," or "both types," and bios means "life." This name-bo
Q. What is the kind of circulatory system present in arthropods? Do these animals have respiratory pigments and heart? In arthropods the respiratory system is open (lacunar). B
Which of the below is usually referred to as "master gland" because it regulates so many body activities? Is it: a) Pituitary gland b) Thyroid gland c) Adrenal gland d
Q. What are the Symptoms of acute pericarditis? Chest Pain Chest pain is the most important symptom. It is retrosternal in location and patient usually locates the site o
Explain how a cell produces and releases proteins. Proteins are made on ribosomes and packaged into vesicles by the Golgi apparatus. The vesicles move to the cell membrane and
Describe the events which lead to the formation of (a) identical twins, (b) fraternal twins. (a) Identical twins are derived from the products of a one zygote which separa
Cholera The risk of infection with cholera is very low in tourists. The parenteral vaccine licensed in the US is no longer available. One oral vaccine called Dukoral is availa
Q. Show the types of oesophagitis conditions? The two types of oesophagitis conditions: 1. Acute Oesophagitis - It is characterized by substantial pain on swallowing. It is
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