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These circular orifices are located at the upper ends of the outflow parts of the left and right ventricles respectively. The pulmonary orifice which is 3 cms, is 0.5 cm larger than the aortic orifice. The aortic orifice is placed in front and to the right of the mitral orifice. The pulmonary orifice is placed above and to the left of the tricuspid orifice and the aortic orifice intervening between them. The pulmonary orifice is guarded by the pulmonary valve and the aortic orifice by the aortic valve. Each valve consists of three semilunar cusps. Each cusp is triangular. It has a convex edge which is attached to the part of the margin of the orifice. It has two free margins that meet at the apex of the cusp. Each cusp consists of a double fold of endocardium with some fibrous tissue in it. The region of the apex is thickened to form a nodule while crescentric parts near the free edges are called lunules.
Cephalopods - Feeding and Digestion in Molluscs Cephalopods are carnivorous. Tentacles or arms are food capturing organs. The number of tentacles changes in different cephalop
Define the Role of Vitamin A in immune response? Vitamins A is essential to normal immune function and- regulation. As discussed above, during vitamin A deficiency the goblet c
Q. Show the process of Construction of Keys? Keys are constructed using contrasting characters. The possible names in the key are divided into smaller and smaller groups. Each
Which is the kind of gamete (for a given trait) produced by a dominant homozygous individual? What is genotypical proportion of these gametes? And what about the recessive homozygo
How do arthropods grow? Because of the presence of exoskeleton the growth of an arthropod is periodical. During the growth period the animal loses the exoskeleton, grows and de
what are the significance of zoological parks in conversation
Giant Nerve Fibres We now know that giant nerve fibres take place in the central nervous system of many polychaetes, oligochaetes, insects cephalopod etc. They are broader an
What is the production of RNA called and what is the enzyme that catalyzes the process? The making of RNA from information included in DNA is called transcription. The enzyme t
Biota of Lakes Lakes exhibit life zones. So far you have been reading about the vertical zonation of lakes. The lakes can be divided into horizontal zones as well. This divis
Why can crossing of an individual that manifests dominant phenotype with another that manifests recessive phenotype (for the same trait) determine whether the dominant individual i
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