2nd and 3rd: The hypoglossal nerve, the second and the third spinal nerves form the brachial plexus. The spiral valve is free ventrally and posteriorly. Later on the cells shift to the outer surface and become extremely thin, inactive and ultimately dead to form the outermost layer of epidermis, which is termed as stratum corneum. It is composed of two lobes, the left and the right joined with each other. (ii) Peripheral nervous system: The nerves arising from the central nervous system constitute the peripheral nervous system. Essay Contents: Essay on the Habitat and Habits Frogs. Food: The adult frog is carnivorous, eating insects, spiders, earthworms etc. On stimulation the sympathetic nerve fibres secrete a chemical sympathin, which stimulates the organs to function. The tongue along with the prey is withdrawn with great rapidity into the buccopharyngeal cavity and the mouth is firmly closed. All the transverse collecting tubules lead into the ureter urinogenital duct.
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Blood Corpuscles: There are present three types of cells in the blood plasma:. 24 Early influence edit The position held by Malthus as professor at the Haileybury training college, to his death in 1834, gave his theories some influence over Britain's administration of India. The nature of this nerve is mixed. (ii) Middle Vascular Coat: Choroid lies next to outer layer which is richly supplied with blood capillaries and black pigmented cells. Malthus has also inspired retired physics professor, Albert Allen Bartlett, to lecture over 1,500 times on "Arithmetic, Population, and Energy promoting sustainable living and explaining the mathematics of overpopulation.