Study of zoology

  DIGESTIVE GLANDS What are digestive glands and their functions There are 5 digestive glands which are involved in digestion. 1. SALIVARY GLANDS 2. GASTRIC GLANDS 3.INTESTINAL GLANDS 4.LIVER 5.PANCREAS 1. SALIVARY GLANDS:- Three pairs of salivary glands are seen in humans. However, in some mammals like rabbits, 4 pairs of salivary glands are seen, i.e., they also include INFRA-ORBITAL GLANDS also. The 3 pairs of salivary glands in human are; SALIVARY GLANDS OF HUMAN A. PAROTID GLAND:- These are present at below of pinna/inner surface of cheeks. B. SUB-MAXILARY GLAND:- These gland is also called as sub-mandibular gland. These are present at angles of lower jaw. C.SUB-LINGUAL GLANDS:- These are present below the tongue. These glands are situated just outside the buccal cavity. The salivary glands have mucosa and serosa cells. Mucus is secreted by mucosa cells. Salivary amylase is secreted by serosa cells. Saliva have 99.5% of water and 0.5% of solutes (such as ions, IgA antibodies, ...

HUMAN RESPIRATORY SYSTEM what are the main parts in respiratory system The major   respiratory organ in human are LUNGS. It is not applied to all the organisms, other animals have different organs for respiration. Some major types of respiratory organs of some animals:- Earth worm - Moist cuticle Most aquatic Arthropods like prawn - Gills Limulus - Book gills Scorpion - Book lungs Insects - Trachea Aquatic molluscs -Ctenidia (gills) Terrestrial moluscs - Pulmonary sacs (gills) Echinoderms - Dermal branchiae,  Tube feet, Respiratory trees etc; Hemichordates - Gills Fishes - Gills Amphibian larvae - Skin, Bucco-pharyngeal lining, Lungs Adult frogs - Lungs Now lets talk about human respiratory system; what are the main parts in respiratory system Human respiratory system consists of major respiratory organ as lungs, but it has a pathway. Our pathway starts from nostrils. Human respiratory system includes 2 tracts. UPPER RESPIRATORY TRACT- Nose, Pharynx, Larynx. LOWER RESPIRATORY ...

  PITUITARY GLAND Glands are involved in the production and secretion of hormones. Pituitary gland is called as Hypophysis. It is the smallest gland among all the other glands, but it controls the all others glands. So, the pituitary gland is called as Master endocrinic gland. This pituitary gland produces 9   hormones. POSITION:- It is located in sella turica, a depression in sphenoid bone and is attached to hypothalamus by a stalk. Anatomically it is divides as; Adenohypophysis (Anterior Pituitary) 7 hormones Neurohypophysis (Posterior Pituitary) 2 hormones 1. ADENOHYPOPHYSIS:- It is also called as Anterior Pituitary. It develops as an outgrowth of ectoderm called "Rakthe's poch", in the roof of buccal cavity. This anterior pituitary have 2 portions; Pars distalis Pars intermedia ADENOHYPOPHYSIS PARS DISTALIS:- In human, this pars distalis region of pituitary is commonly called as the anterior pituitary. This produce 6 types of hormones; they are:-  Human growth...