Biology(digestive system)
Content
(Digestive System)
Group No.4
Submitted By:
Castro,Cendrix
Paolo,Christian
Tolentino,Athea
Submitted to:
Prof.Josephine Tondo
Faculty-in-charge
I.Description of the system
Your digestive system is uniquely constructed to perform its specialized function of turning food into energy.
Each step in digestion requires energy, and thus imposes an “overhead charge” on the energy made available from absorbed substances
The major part of digestion takes place in the small intestine.
The large intestine serves as the site for fermentation of indigestible matter by gut bacteria and for reabsorption of water from digests before excretion
Mechanical and chemical digestion begins in the mouth where food is chewed nad mixed with saliva to begin enzymatic processing of starches.
The stomach will continues to break down mechanically and chemically through churning and mixing with both acids and enzymes.
The whole digestive system is about 9 meters long
II.Parts of the system
1.Mouth
Known as the “Buccal Cavity”,where food is chewed
Saliva is secreted in large amounts (1-1.5 liters per day) by three pairs of exocrine glands(parotid, submandibular, and subligual) in the mouth and mixed with the chewed food by the tongue
Saliva cleans the mouth, moistens the food, and contains digestive enzymes such as salivary amylase.
It contains mucus, it helps to soften the food and form into bolus.
Swallowing transports the chewed food in the esophagus passing the pharynx
Swallowing is coordinated by the swallowing center in the medulla oblongata and pons
2.Pharnyx
Part of the neck and throat situated behind the mouth and nasal cavity, and cranial, or superior, to the esophagus.
Both part of digestive and respiratory system
Epiglottis closes over trachea when food is swallowed to prevent choking or asphysxiation
Orapharynx is the part behind the mouth. It is lined with stratisfied squamous ephitelium.
Nasopharynx lies behind
(Digestive System)
Group No.4
Submitted By:
Castro,Cendrix
Paolo,Christian
Tolentino,Athea
Submitted to:
Prof.Josephine Tondo
Faculty-in-charge
I.Description of the system
Your digestive system is uniquely constructed to perform its specialized function of turning food into energy.
Each step in digestion requires energy, and thus imposes an “overhead charge” on the energy made available from absorbed substances
The major part of digestion takes place in the small intestine.
The large intestine serves as the site for fermentation of indigestible matter by gut bacteria and for reabsorption of water from digests before excretion
Mechanical and chemical digestion begins in the mouth where food is chewed nad mixed with saliva to begin enzymatic processing of starches.
The stomach will continues to break down mechanically and chemically through churning and mixing with both acids and enzymes.
The whole digestive system is about 9 meters long
II.Parts of the system
1.Mouth
Known as the “Buccal Cavity”,where food is chewed
Saliva is secreted in large amounts (1-1.5 liters per day) by three pairs of exocrine glands(parotid, submandibular, and subligual) in the mouth and mixed with the chewed food by the tongue
Saliva cleans the mouth, moistens the food, and contains digestive enzymes such as salivary amylase.
It contains mucus, it helps to soften the food and form into bolus.
Swallowing transports the chewed food in the esophagus passing the pharynx
Swallowing is coordinated by the swallowing center in the medulla oblongata and pons
2.Pharnyx
Part of the neck and throat situated behind the mouth and nasal cavity, and cranial, or superior, to the esophagus.
Both part of digestive and respiratory system
Epiglottis closes over trachea when food is swallowed to prevent choking or asphysxiation
Orapharynx is the part behind the mouth. It is lined with stratisfied squamous ephitelium.
Nasopharynx lies behind
References: http://www.innerbody.com/image/digeov.html http;//en.wikipedia.org/wiki/Digestion http://en.wikipedia.org/wiki/Digestive_disease Yang and Capco, Biology Third Edition, Phoenix Publishing House. 2010 Ramos and Morales,Exploring life Through Science Biology,Phoenix Publishing House.2007 The Human Digestive System