28.08.2019-917 views -Biology(digestive system)
Group Number 4
Prof. Josephine Tondo
We. Description of the system
The digestive system can be uniquely constructed to perform its specialized function of turning food in energy. Each step of the process in digestion requires energy, and thus imposes an " overhead charge” on the energy made available by absorbed chemicals The major a part of digestion occurs in the small intestine. The best intestine serves as the site pertaining to fermentation of indigestible matter by stomach bacteria as well as for reabsorption of water coming from digests ahead of excretion Physical and chemical digestion commences in the mouth where food is definitely chewed nad mixed with secretion to begin enzymatic processing of starches. The stomach is going to continues to break up mechanically and chemically through churning and mixing with acids and enzymes. The full digestive system is around 9 meters long
II. Parts of the device
1 . Oral cavity
Known as the " Buccal Cavity”, where meals is wrecked
Saliva is definitely secreted in large amounts (1-1. 5 liters per day) by 3 pairs of exocrine glands(parotid, submandibular, and subligual) on the teeth and combined with the chewed food by the tongue Drool cleans your mouth, moistens the meals, and contains intestinal enzymes including salivary amylase. It contains nasal mucus, it helps to soften the food and kind into bolus. Swallowing transfers the chewed food in the esophagus moving the cou Swallowing is definitely coordinated by the swallowing centre in the medulla oblongata and pons
installment payments on your Pharnyx
Area of the neck and throat positioned behind the mouth and nose cavity, and cranial, or superior, for the esophagus. Equally part of digestive and breathing
Epiglottis closes over trachea when foodstuff is ingested to prevent choking or asphysxiation Orapharynx is a part lurking behind the mouth. It is lined with stratisfied squamous ephitelium. Nasopharynx lies lurking behind the nasal cavity and like the sinus passages is usually lined with cilliated columnar pseudostrified ephitelium Hypopharnyx serves as a lobby for food and air flow and i padded with a stratified squamous ephitelium. It is continuous with the esophagus.
During swallowin, food ha the " right of way” and air passage in the short term stops.
a few. Esophagus
It is a narrow muscular tube regarding 20-30 centimeters long, which starts with the pharnyx at the back of the mouth, moves through the thoracic diaphragm, and ends in the cardiac orifice of the abdomen. At the top of the esophagus, is actually a flap of tissue known as epiglottis that closes during swallowing to stop food from entering trachea. The chewed food will be shifted down the esophagus to the tummy through peristaltic contraction of the muscles.
A little J-shaped sack with walls made of thick distensible muscle tissues, which retailers and helps break down food. Tummy churning has the effect of helping the physical disassembly commenced im your mouth Food makes its way into the belly through the cardiac office wherever it is even more broken separate and throughly mixed with digestive, gastrointestinal acid, pepsin and other intestinal enzymes in order to down protein. The digestive enzymes in the abdomen work at a certain pH and temperature a lot better than any other folks. Acid provides an optimum ph level for the response of the enzymes pepsin and kills many microorganisms which have been ingested with the food. Additionally, it may denature protein. This is the process of reducing polypeptide bonds disrupting salt connections, which in turn causes a lack of secondary, tertiary, or quarternary protein structure. The parietal cells from the stomach as well secrete a glycoprotein referred to as intrinsic aspect, which permits the compression of vitamin B-12. Mucus neck cells are present inside the gastric glands of the abdomen. They top secret mucus, which will along with gastric juice which takes on an important position in wetness and protection of the mucosal ephitelium via excoriation by the highly focused hydrochloric chemical p. Food in the stomach is usually...
http; //en. wikipedia. org/wiki/Digestion
Yang and Capco, Biology Third Edition, Phoenix, az Publishing Property. 2010
Ramos and Morales, Exploring your life Through Technology Biology, Phoenix az Publishing House. 2007
A persons Digestive System