Short notes on the structure of a cardiac muscle fibre K. Aryan Short notes on the structure of a cardiac muscle fibre The cardiac muscle fibres are made up of short cylindrical fibres joined end to end.
Share with your friends 0 Hi Nandini, Ans: The digestive organ that is located in the upper abdomen, under the ribs. The upper part of the stomach connects to the esophagus, and the lower part leads into the small intestine.
When food enters the stomach, muscles in the stomach wall create a rippling motion peristalsis that mixes and mashes the food. At the same time, juices made by glands in the lining of the stomach help digest the food.
After about 3 hours, the food becomes a liquid and moves into the small intestine, where digestion continues. Thanks for asking your doubt. It receives food from the oesophagus. It also releases some enzymes which break down proteins. The semi digested food is passed to the small intestine.
The stomach receives food from the esophagus. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter.
The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion. The pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.
Its shape is like a flattened U and it is widest part of the alimentory canal. It receives food from the food pipe at one end and opens into the small intestine at the other end. The walls of stomach secretes gastric juices which helps in digestion of food.
Gastric juices contain hydrochloric acid hcl which kills bacteria and provide acidic medium. Mucus protects the inner lining of stomach.
From here the food is passed to small intestine. It starts at oesophagus and end at small intestine 0 A stomach is a Sack like structure that helps in better digestion and makes it easy to excrete 0 There are four regions in the stomach.
The oesophagus opens into this. This opening is called the cardiac orifice. This is guarded by the cardiac sphincter muscles which prevent the regurgitation moving back of the food into the oesophagus.
The fundus is the dome like upper part of the stomach and it projects above the cardiac orifice. The main part of the stomach is called the body and at its lower ends it narrows into the pyloric region.
This regulates the movement of the food into the intestine. Structurally the wall of the stomach is made up of four layers of tissue. An outer covering of the serous membrane the peritoneum 2. A muscle layer which inturn is made up of three layers of visceral muscle fibres namely longitudinal, circular and oblique.
A sub mucous layer consisting of loose areolar tissue carrying blood vessels, lymphatics and nerves. The mucous membrane constituting the inner most layers is thick and smooth having a velvety surface when the stomach is full. These folds open up at the entry of the food and allow the stomach to expand to accommodate a large quantity of food.
Embedded in these gastric pits are found a number of glands which secret the gastric juice. There are three types of gastric glands. The peptic cells that produce zymogen 2. The oxyntic cells that secret HCL and 3. Mucous cells which add mucous.
The three secretions together form an acidic gastric juice with a pH of 2. The gastric juice is discharged into the stomach. It contains water, salts, mucin, hydrochloric acid, pepsin, rennin and gastric lipase. It has been estimated that on an average about two to three litres of gastric juice is secreted per day.Heart wall is made up of cardiac muscles and hence called myocardium.
A few bunches of unstriped muscles fibres are found in cardiac muscles. These fibres are branched and form networks. Notes over the digestive system that go with a class presentation, includes information and labeling of structures.
rings of muscles contract and relax to push food down the canal (PERISTALSIS) Mouth. (cardiac sphincter) - prevent food and chemicals from moving up out of stomach.
Stomach. Cardiac muscle is the type of muscle found in the heart, and at the base of the venae cavae as they enter into the heart. Cardiac muscle is intrinsically contractile .
Cardiac Muscle and Cardiac Conduction System and EKG I. Histology of Cardiac Muscle Tissue A. Compare cardiac muscle with skeletal muscle tissue B. Regeneration of Heart Cells C. Contractility of cardiac muscle cells (see physiology of cardiac muscle.
Short notes on the structure of human heart. The heart is covered by a wall called pericardium which is made up of three layers.
These are the epicardium, the myocardium and the endocardium. The epicardium is a serious membrane and is the outer most layers. This secrets a serious fluid into the space between the visceral and the parietal pericardium. Structure of Cardiac and Smooth Muscle Although it is striated, cardiac muscle differs from skeletal muscle in that it is highly branched with cells connected by overlapping projections of the sarcolemma called intercalated discs.