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Tuesday, January 31, 2012

Endocrine Tissue - Lesson 298

In human body, endocrine tissue like structures function as endocrine glands, but they are not true endocrine glands. In this post, we will learn about these endocrine tissues work like endocrine glands. First, our body cells secrete prostaglandins. This secretions helps to contract uterus. Prostaglandis also helps to lower blood pressure and to clump blood platelets. This also helps to lessen acid secretion in stomach. There are three secretions are from gastrointestinal tract or GI tract or in the alimentary canal. These three secretions are named as cholecystokinin, gastrin, and secretin. Cholecystokinin helps to contract gallbladder. Gastrin helps to stimulate gastric secretion. Secretin helps to stimulate pancreatic enzymes. Kidney secretes a secretion that is called as erythropoietin. This stimulates the production of erythrocytes or red blood cells or RBCs. 

Other than endocrine tissue, we will now learn about true endocrine glands. Pineal gland secretes a material named as melatonin. Melatonin affects brain and forms a hormone named as gonadotropins. Human skin secretes vitamin D, which helps to absorb calcium. Thymus gland secretes thymosi, which helps to get immune response. The pineal and thymus glands can also be added to the endocrine glands. The true endocrine glands are pituitary gland in the brain, pineal gland in the brain, thyroid gland in the neck, parathyroid glands in the neck, thymus gland in the sternal area, adrenal gland above each kidney, ovaries in female reproductive system, and testes in male reproductive system. We may add pancreas in the liver too as a true endocrine gland. We can call the above-said glands as endocrine glands because they have no ducts to carry blood. These glands secrete some hormones directly into the blood to maintain all the main functions of the body. Each of the endocrine secretes its own hormones and these hormones directly enter into blood.

In the next post, we will learn about endocrine glands and their hormones and their functions. Okay. Come on.

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To go to the prior post about, Hormones and their functions, please visit the link below.