Thyroid Gland Hormones Structure And Functions Class 12 Biology

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Hi Everyone! Welcome To My Channel Ali Academy Biology Lectures • About This Video ........................ • In This Video Lecture You Will Learn Basic Concept Of Thyroid Gland • Thyroid gland • (or tetraiodo-thyonine: T4), tri-iodothyronine or T3 (which has a structure similar to thyroxine • produces higher levels of secretions during periods of rapid growth and sexual maturation and in • with 3 iodine atoms rather than 4) and calcitonin hormone. The thyroid is active continuously but • In mammals it consists of two lobes situated below the larynx . It produces thyroxine • stress situations such as cold and hunger. • Thyroxine and tri-iodothyronine, the two hormones act in essentially the same way. They act on the • ion concentration in the blood causes • of which’weight is increased. The condition is known as myxoedema, and it is characterized by • in diet, produces swelling of the neck (goiter) and may lead to deposition of excess fat as a result • metamorphosis. If secretion of thyroid is deicient,, tadpole larva of frog does not metamorphose • normally. They are small, have coarse scanty hair, thick yellowish scaly skin and are mentally • disease is the production of an abnormal body protein which continuously stimulates the thyroid • If congenitally deicient, the lack of thyroxine causes cretinism, where the individual fails to develop • to develop into frog, but instead grow to a large sized tadpole. • stimulation of the synthesis and release of calcitonin; low levels of Ca++ ions suppress its manufacture. • on brain cells causing them to diferentiate. In amphibians, they bring about the process of • to excessive secretion. • All bodily and mental processes are retarded. High Ca+ • retarded. They also fail to develop sexually. Deiciency later in life, perhaps due to iodine shortage • basal metabolic rate by stimulating the breakdown of glucose and release of heat and generation • puiness of hands and skin. • Excess thyroxine produces a condition called Graves’ disease, with exophthalmic goiter and increase • of ATP. They also act in conjunction with somatotropin in bringing about growth, and act directly • in the basal metabolic rate. This can lead to cardiac failure if prolonged. The cause of Graves’ • Excess or deiciency leads to disturbance of calcium metabolism with its associated efects on nerve, • skeleton, muscle, blood etc. Calcitonin is antogonistic to parathormone hormone. • About This Channel..................... • I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources. • One-stop destination for all biology lectures. • _ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial • _ The videos are categories under various heading to make the students life simplified • Visit My Other Channel Playlist ..................... • NMDCAT PART 1: • New 1st Year Biology • NMDCAT PART 2: • New 2nd Year Biology • Class 11th Lectures: • New 1st Year Biology • Class 12th Lectures: • New 2nd Year Biology • Class 10th Lectures: • • Matric Biology • Subscribe My Channel: • / aliacademya7r • Social Link........................ • Instagram: • https://instagram.com/ranaalibiologis...

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