Category: ZOOLOGY(II Year VIDEO)

This video is about Mechanism of Heart. This mechanism can be divided into heart beat and cardiac cycle. Continuous beating of heart is known as cardiac cycle. It takes 0.8 sec. This mechanism is controlled by heart conducting system (HCS). HCS=SAN+ AVN+ Bundle of his + Purkinjee fibers.

Pearl is only gem stone which is produced by living animals. Pearl formation is a biological process in which pearl is formed by living animals against an irritant in the body of Oysters. The most productive Oyster is Pinctada vulgaris. The pearl develop in between shell and mantle of oyster. The layers of nacre develop into the pearl. It is made up of calcium carbonate and chonchiolin. The pearl may be natural and artificial. The peal culture industry is developed in Japan. It may be white, black, grey, red, green and blue in colour. The black coloured pearl is most rare and precious. It is used in jewelry.

This video is about digestive system. Digestion occurs through this system. Alimentary canal and digestive glands are important parts of this system.

Diaphragm and Intercostals muscles are the two important factors of breathing. Intercostals muscles are of two types external and internal. During inspiration diaphram and ext I. M. contracts while int I.M. relaxed. Due to this volume of thoracic cavity increased, pressure decreased and oxygen enters into cavity. During expiration process is just opposite and due to this when volume of cavity decreased, pressure increased carbon dioxide eliminate.

Oxidation of food generates carbon dioxide. Transportation of this by three ways. Approximately 7 % of this transport in dissolved form, 23%in carbaminohaemoglobin form and 70% in bicarbonate form. CO2 enters into erythrocyte and binds with water molecule in the presence of carbonic anhydrase enzyme and formed carbonic acid. This acid dissociates into hydrogen and bicarbonate ions. Hydrogen ion binds with hemoglobin and formed a buffer molecule haemoglobinic acid. Bicarbonate ion passed out from RBC to plasma and bind with Na/K molecules. Due to this positivity of RBC increase and to restore this chloride ion enters in RBC. This phenomenon is known as chloride shift.

This video lecture is about the nervous system of Prawn. Prawn has well developed nervous system having supraoesophageal ganglia as brain, ventral thoracic mass and double origin ventral Nerve Cord as Central Nervous System. Nerves arise from the brain, ventral thoracic mass and ventral nerve cord and supply to various appendages and other body parts…