• Human anatomy

    EXCRETORY SYSTEM IN HUMAN

    Except for urinary bladder which is endodermal in origin, the whole excretory system is Except urinary bladder which is endodermal in origin, the whole excretory system is Except mesodermal. In human the kidney is retroperitoneal i.e., the kidney is located outside the coelomic cavity and is covered by peritoneum (coelomic epithelium) from the ventral side only. The size of each kidney is ~10 cm and it weighs is ~150 g. The two kidneys are asymmetrical, the Rt. being posterior to the Lt. Each kidney is bean-shaped with a groove (hilus) in the middle. The hilus is absent in frog’s kidney. The white fibrous connective tissue-covering around kidney is called renal…

  • Countercurrent-in-the-kidney.jpg
    Human anatomy

    Urine Formation

    3−steps are involved in the formation of urine A) Ultra filtration It is filtration under pressure. Glomerular capillary pressure (45 mm of Hg) favours filtration. The Colloidal osmotic pressure (due to plasma proteins, particularly albumin) acts against filteration. Its value is ~20 mm of Hg. The Capsular filtrate pressure, due to the glomerular filtrate in the Bowman’s capsule, also acts against filtration. Its value is ~10 mm of Hg. Net filtration pressure = 45 − (20+10) mm of Hg = 15 mm of Hg or 10 − 20 mm of Hg. Only 1/5 of plasma (20%) gets filtered from glomerulus per unit time. It is about 125 ml per minute.…

  • Human anatomy

    An Overview On Pineal Gland

    The pineal gland is a small, pea-shaped gland in the brain. Its function isn’t fully understood. Researchers do know that it produces and regulates some hormones, including melatonin. It is ectodermal in origin. It is unpaired (Single) and is attached to epithalamus of the diencephalon. It is, therefore, also known as Epiphysis cerebri (Pituitary, attached to the hypothalamus, is called Hypophysis cerebri) It is considered to be the ‘seat of soul’. In a human, it starts degenerating at the age of 7-8 years. The calcium and magnesium salts are deposited in this gland at later stages and the structure is then known as ‘brain sand’. This gland produces single hormone…

  • Human anatomy

    An overview of Pituitary Gland

    It is called master gland (master of endocrine orchestra) as it regulates the functioning of other endocrine glands like thyroid, Adrenal cortex, testes and ovaries etc. However, the secretions of pancreas, thymus and pineal body are not regulated by the hormones of the pituitary. Pituitary is a single or unpaired gland weighing about 0.5 gm. It is present in the ‘Sella tursica’ cavity of Basi-sphenoid bone and is attached to the floor of Diencephalon (hypothalamus) of forebrain through a stalk called Infundibulum. As it is present below diencephalon of fore-brain it is also known as Hypophysis cerebri. In mammals, it is ectodermal in origin. It consists of two-parts – (1)…

  • Human alimentary tract
    Biology,  Human anatomy

    Human Digestive Enzymes

    Human digestive enzymes are mainly synthesized in the salivary glands and in the pancreas As we’ve discussed, enzymes are made up of amino acids found in proteins so a ready supply of these building blocks is required to ensure there are optimal levels of digestive enzymes at all times. Digestive enzymes are mixed in the saliva and pancreatic juices and are released into the mouth and small intestines, respectively, to support digestion of proteins, fats, and carbohydrates. Their synthesis and release occur via carefully orchestrated and tightly controlled hormone systems that are activated not just when food hits our taste buds but also by the sight, smell and sound of…

  • Biology,  Human anatomy

    What is the function of Earwax in the Human Body?

    The earwax is very useful substance which keeps our ears healthy and is produced naturally in the ear. This wax is found not only in humans, but also in animals. It cleans, protects and lubricates the ears. Let us study through this article about earwax, its function etc. Important facts about Earwax 1. The scientific name of the earwax is cerumen. It is formed in the outer part of our ear canal where there are thousands of glands. It is sticky and shiny substance. It coats the ear to moisturize it and fight against infection.2. Earwax also prevents from dust, dirt, and insects from entering the ear.3. It also works like a natural antibiotic,…

  • Human anatomy

    HUMAN DIGESTIVE SYSTEM

    Digestion involves the breaking of complex organic food molecules into simpler one by hydrolysis. Carbohydrates, proteins, fats and nucleic acids are large complex organic food molecules. They are insoluble and polymeric in nature. During digestion different enzymes helps in the breakdown of these complex polymers into soluble monomers which are required for energy generation.The different steps of digestion involve: Movement of food through the alimentary tract Secretion of digestive juices and digestion of food Absorption of water, various electrolytes, vitamins and digestive end products. Human digestive system mainly consists of two parts: 1) Alimentary tract and 2) secretory glands Alimentary tract It provides continuous supply of nutrients, vitamins, electrolytes and…

  • Human anatomy

    NERVOUS SYSTEM

    Nervous system is the most complex system in human. Its uniqueness is due to the vast complexity of thought process and control action it can perform. It co-ordinates physiological functions in human. Nervous tissue originates from ectoderm and is specialized for receiving stimuli and transmitted message. The nervous tissue consists of highly specialized cells called the neurons. Thus neurons are functional unit of nervous system. The detailed structure of a neuron is shown in Figure.   An Overview of Nervous System in animals. A neuron is mainly divided into two parts: 1) Cell body or cyton and 2) Cell process. Cyton It is a broader part of neuron which contains…

  • Human anatomy

    Human Eye: Anatomy, parts and structure

    The eye is the photo-receptor organ. Size and shape: Human eye is spherical about 2.5 cm in diameter. Location: it is situated on an orbit of the skull and is supplied by the optic nerve. There are 6 sets of muscles attached to the outer surface of the eyeball which helps to rotate it in a different direction. Four sets of these muscles are straight muscles; superior, inferior, medial and lateral rectal muscle and two sets are oblique muscles; superior and inferior oblique muscles. Structurally two eyes are separated but some of their activities are coordinated so that they function as a pair. The anatomical structure of Eye Eyeball consists…

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