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Regulatory Mechanisms
The immediate response to acute temperature chance is mediated through the central nervous system. The physiological thermostat has been located in the hypothalamus of the mammal and the spinal cord of the bird. These are the centres of reflex action and are activated by the temperature receptors of the skin or mucous membranes or directly through the changes in the temperature of the hypothlamus (or the blood circulating through it).
The physiological thermostat through the efferent nerve fibres stimulate the muscles for panting and shivering and through the autonomic system it regulates the cutaneous blood vessels, the sweat glands and so on. In some of the amniotes, the pineal and parapineal organs influence thermoregulatory behaviour and physiology. Cardiovascular and cutaneous responses are acute reactions to temperature change. If the exposure is more prolonged, the endocrine system enters the picture and the metabolism is altered particularly by way of the thyroid and adrenal glands.
Invertebrates - Osmotic and Ionic Regulation Regulation of water and ions in invertebrates is done by neuroendocrine mechanism. It operates at the level of Malpighian tubules
Use of micro-organisms to control insect pests, pathogens or weeds constitutes biological control, and the biological agents employed are called biocontrol agents. Micro-organis
WHAT IS RECAPITULATION THEORY OF EMBRYOLOGY?AND WHAT IS EMBRYOLOGY
How it respire
Define Protection of poly unsaturated fatty acids (PUFA) from oxidative damage? The major biological role of vitamin E is to protect PUFAs and other components of cell membrane
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Braxy The causative agent of braxy is Cl. septicum. It usually affects lambs. The agent is a normal inhabitant of soil and is frequently found in the faeces of herbivores. Bra
What is meant by saying that in relation to a given trait conditioned by a gene with two different alleles the gametes are always "pure"? To say that gametes are pure means tha
Littoral Zone Plants of the littoral zone Two types of plants occur here: Non-rooted phytoplanktons which include all kinds of algae occurring in the limnetic as wel
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