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Q. Is the epithelium vascularized? How do oxygen and nutrients reach the epithelium? Why is this feature an important evolutionary acquisition?
Epithelia are not vascularized capillaries don't directly reach their cells the epithelium exchanges substances by diffusion with the connective tissue situated under it.
Since the epithelia are not vascularized minuscule scratches or skin injuries that happen all the time do not trigger bleeding and do not expose the blood to contamination from external agents this is an important protective strategy discovered by evolution.
In high altitudes is it necessary for the blood to have more or less hemoglobin? In high altitudes the air is rarefied and oxygen concentration is lower than in low altitudes.
Q. What are the physiological systems known as integrative systems? Why is this designation justified? The integrative systems are the endocrine system and the nervous system.
How can the excretory system of annelids be described? In each segment (metamere) of the being a pair of complete excretory structures called metanephridium exists. The metanep
Q. What is the anoxia? Anoxia is a situation in which there is no available oxygen in the cell without oxygen the respiratory chain stops there is no ATP production the cell do
Organic Substances - Abiotic Components These include carbohydrates, proteins, lipids and their derivatives which are derived from the waste products of plants and animals or
Ur o l it h i a s i s The presence of calculi (urolith) in the urinary system is termed as urolithiasis, and the disease is characterized by distension of bladder and
Unified Cell Theory The present unified cell theory states that All living things are composed of either a single Cell or of the cells and cell products. The cell is a m
PLANE OF CLEAVAGE - Each cleavage of the division zygote is marked by a cleavage furrow. Usually the first cleavage furrow is vertical & passes through the main axis of t
Explain the Assessment of Zn Status? Sensitive indices for assessing zinc status are unknown at present. Static indices, such as zinc concentration in plasma, blood cells and h
Malpighian Tubules Other arthropods like insects and myriapods and arachnids have Malpighian tubules, the outgrowths of alimentary canal like excretory organs. Malpighian tub
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