Lab 01 Endocrine Lecture slides.pdf

Lab 01 Endocrine Lecture slides.pdf - Endocrine System...

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Endocrine System
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Endocrine system In Mastering you will complete physio-ex experiments on the endocrine system. This is summary of the information that is contained in them not the experiments themselves. You still need to know what you did and what happened and why. Make sure to fill in your lab manual as you complete the experiments We will be adding to this information throughout the semester.
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Coordinates and integrates the function of all the different physiological systems Critical role in maintaining homeostasis Consists of discrete individual glands that produce and secrete chemical messengers known as hormones . Hormones exert effects only on Target cells which possess receptor cells for the specific hormones on them Endocrine system Tropic hormones : stimulate the secretion of other hormones
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Target Cell Endocrine Gland Target Cell When stimulated, an endocrine gland secretes its’ hormones Target Cell Which then exerts a biological action Blood carries the hormones to target cells Endocrine Gland Endocrine Gland
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Organs in the endocrine system do not function independently one often coordinates the activity of another gland No one system act independently of any other system Hormone regulation Mostly Negative feedback mechanisms If too little of a hormone it will be produced, When too much of a hormone production reduced or stopped Exception oxytocin regulated by positive feedback
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Metabolism: The range of all biochemical reactions occurring in the body that are necessary to maintain life Anabolism : the building up of small molecules into larger Stores energy Ex. Bone and muscle growth Catabolism : the breakdown of large molecules into smaller Releases energy Heat released in these reaction is used to maintain body temp in homoeothermic organisms Ex: Digestion
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Thyroxine Secreted by thyroid gland when stimulated by Thyroid stimulating hormone (TSH) Production controlled by: Pituitary gland directly by releasing the TSH & Hypothalamus indirectly by secreting Thyrotropin- releasing hormone (TRH) to stimulate the pituitary gland to release TSH If TSH levels get too high thyroid gland enlarges and a goiter is formed.
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