Skip to main content

Biology Notes for Class 11 Science – Pancreas

Biology Notes for Class 11 Science – Pancreas

Here we will discuss Pancreas, one of the important digestive gland. It covers the unit 5, chapter 16 of Class 11 Biology.
PANCREAS
The pancreas is an abdominal organ that is located behind the stomach and is surrounded by other organs, including the spleen, liver and small intestine. The pancreas is about 6 inches (15.24 centimeters) long, oblong and flat. It is located on the back of the abdomen, behind the stomach.  The pancreas is connected to the duodenum (the first section of the small intestine) through a small tube called the pancreatic duct. It is an endocrine gland producing several important hormones including insulin, glucagon, somatostatin, and a pancreatic polypeptide which circulate in the blood. The pancreas is also an important digestive organ, secreting pancreatic juice containing bicarbonate to neutralize the acidity of chyme (The partly digested food mixed with gastric juices) which is expelled from the stomach, as well as digestive enzymes that assist digestion and absorption of nutrients in the small intestine. These enzymes help to further break down the carbohydrates, proteins, and lipids in the chyme. The pancreas is also known as a mixed gland (it acts as an exocrine as well as endocrine glands)
Pancreatic Juice
The pancreas acts both as an endocrine and exocrine gland. The exocrine part of the gland consists of acini (singular is acinus, the acinus is a small sac-like cavity in a gland, surrounded by secretory cells). The endocrine part includes many cells known as islets of Langerhans. The acinar cells discharge their secretions into the main duct of the gland that communicates with the bile duct and releases their secretion into the duodenum through the sphincter of Oddi.
The exocrine pancreas produces 1200 to 1500 ml of pancreatic juice per day. This juice is colorless and has a pH of about 8. The pancreatic juice contains 1-2% of the organic material and 1% of the inorganic material. The organic matter is mainly protein in the form of enzymes. The most important inorganic component is sodium bicarbonate which makes the pancreatic secretion alkaline.  Sodium bicarbonate is secreted from the epithelial cells lining the small pancreatic ducts. The acinar cells secrete several enzymes that help in digestion. One volume of pancreatic juice can neutralize equal volume of acidic gastric content. When the acidic gastric content passes through the pylorus (part of the stomach) into the duodenum, they are partially neutralized by the bicarbonate in the pancreatic juice for the effective enzyme action.
Visit our site www.takshilalearning.com  for 11 science, CBSE / NCERT Class 11 solutions, online classes, sample papers, CBSE exams pattern and CBSE guide.
Call us : 8800999280/8800999284 
Labels:

Comments

Post a Comment

Thank you we will contact ASAP.

Popular posts from this blog

Magnetic and non-magnetic material Class 6 Science

Magnetic and non-magnetic material  Class 6 Science A magnet is a substance that is drawn to certain magnetic materials like iron, cobalt, and nickel. Magnets have the ability to draw iron to them. Natural magnets are rocks that naturally draw iron. Non-magnetic materials include things like wood, rubber, coins, feathers, leather, etc. that are not drawn to iron. Magnet characteristics It pulls magnetic materials, such as iron. The magnet's two ends are referred to as its poles. The magnet's diametrically opposed poles are drawn together. Heating, hammering, or dropping causes it to lose its characteristics. On the basis of properties types of Magnets Temporary magnets are those magnets that are magnetic for only a little duration. Typically, iron, cobalt, or nickel are used to make them. When they are close to the powerful magnet, they act like a magnet. When they are yanked away from the powerful magnet, they stop being magnetic. Permanent magnets are magnets that have magne...
Post a Comment
Read more

Best Sample papers for Bank PO Exam Download

Sample papers for Bank PO Exam | Question Paper for Bank PO : Institute of banking Personnel Selection (IBPS) Department issued a Notification of IBPS PO 2017  exam announced in October month. IBPS Probationary Officer (PO) Online Application Form process will be begin from July 2017. This is a hard exam for all students so aware of its value. Large number of  candidates will participate in this exam. So all candidates should prepare well for it. Check out IBPS, Bank PO Sample papers, Question Paper Pattern, SBI  PO Syllabus ,   IBPS Syllabus  and other IBPS PO Preparation 2017 This paper is identical to any Bank PO Question Paper Pattern. Check whole IBPS Bank “PO question paper” subject wise. IBPS (PO) Paper Pattern Analysis with Syllabus and main topics of IBPS Exam 2017. PO Question Paper Pattern, Bank PO sample Papers for IBPS Bank Exam IBPS PO Exam will be conducted at three levels 1st- PO Preliminary Exam 2nd- PO Mains Exam 3rd- PO Common ...
Post a Comment
Read more

What are Noble Gases? Example and noble gases name

What are Noble Gases? Example and noble gases name Noble Gases Noble gases, sometimes known as inert gases or erosions, are part of the modern periodic table's 18th group. This group is made up of the following individuals: Helium is a kind of gas (He) Neon (Ne) Argon is a gas (Ar) Krypton  (Kr) Xenon is a kind of xenon gas (Xe) Radon is a gas that can cause cancer (Rn) Noble gases exist in a gaseous state under typical temperature and pressure conditions. Because all noble gases have stable electronic structures, they have very little chemical reactivity. They are monoatomic gases that do not readily form molecules. 'ns2np6' represents the basic electrical configuration of noble gases. As a result, noble gases' outermost valence shells can be deemed 'complete.' The chemical inertness of the group of 18 elements is due to this. Because of the stability of certain elements, these gases form a group. These stable elements' crusts are totally filled. Regardles...
Post a Comment
Read more