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Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition?
Epithelia are not vascularized (capillaries do not directly reach their cells). The epithelium exchanges substances by dispersal with the connective tissue situated under it.
As the epithelia are not vascularized minuscule skin injuries or scratches that occur all the time do not trigger bleeding and do not expose the blood to contamination from external agents. This is an significant protective method discovered by evolution.
What is the life cycle of Trypanosoma cruzi? Trypanosoma cruzi is a heteroxenous parasite, i.e., it has an intermediate host, the triatomine bug, and an ultimate host, the hum
ASSISTING IN PROCEDURE OF BIOPSY Biopsies are removal of a small piece of tissue for examination under microscope. Such examinations are called hist to pathological examina
what is the meaning of direct and indirect respiration
Each gene has a characteristic mutation rate. Mutation rates are often described as an average per gene basis. For instance, Drosophila has one detectable mutation per 10,000 loci,
Plot the data as a suitable graph. Join the points with the best-fitting smooth curve.Temperature oC(5,10,11,13,17,19) Time taken for eggs to hatch/h 230 90 70 30 25
What is Primary Growth in Shoot? The growth in height of a plant stem results from the division of cells at the apex, or tip of the stem, called the shoot tip. Here, a group o
Explain the Community ecology of disease? Ebola, hantavirus, bubonic plague, Lyme disease, West Nile virus, rinderpest, and canine distemper virus are all instances of diseases
Q. Is there vaccine against tuberculosis? The vaccine against the tuberculosis is called as BCG (bacillus Calmette-Guérin). BCG is not used in a few countries where tuberculosi
Describe the Advantages and Disadvantages of insulin pump Advantages - Insulin pumps deliver more precise amounts of insulin. This supports control over blood sugar level,
a) Name the mineral elements needed by (i) bones, (ii) red blood cells, (iii) the thyroid gland b) Which of these elements is (i) present in milk, (b) lacking in milk?
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