<body><script type="text/javascript"> function setAttributeOnload(object, attribute, val) { if(window.addEventListener) { window.addEventListener('load', function(){ object[attribute] = val; }, false); } else { window.attachEvent('onload', function(){ object[attribute] = val; }); } } </script> <div id="navbar-iframe-container"></div> <script type="text/javascript" src="https://apis.google.com/js/platform.js"></script> <script type="text/javascript"> gapi.load("gapi.iframes:gapi.iframes.style.bubble", function() { if (gapi.iframes && gapi.iframes.getContext) { gapi.iframes.getContext().openChild({ url: 'https://www.blogger.com/navbar/4581973098682586317?origin\x3dhttp://westwoodbiology.blogspot.com', where: document.getElementById("navbar-iframe-container"), id: "navbar-iframe" }); } }); </script>

recent


Shoutbox!

Current Poll

Take the poll

Archives

Nutrition in Mammals: Drugs Friday, April 21, 2006 |

Drugs usually are soluble and can be absorbed almost directly. That's why some drugs need to be in capsule form as it is too soluble and gets dissolved even before it can reach its destination. We'll discuss about drugs in greater detail in Chapter 16
Regards,
Miss Gay

----- Original Message -----
From: `aSyikin- kyne
To: wwssbio@yahoogroups.com
Sent: Wednesday, April 19, 2006 9:25 PM
Subject: [wwssbio] Nutrition in Mammals: drug

Firstly, if drug is taken into the body, will it be digested? If so, how does it "digest"?
Secondly, how will the concentration of the drug in person's body affect the time consumed?
Thirdly, why some of the drugs take a longer time to reach highest blood concentration?


Labels:

Nutrition in Mammals Sunday, April 9, 2006 |

1) The digestion occurring in both the stomach and small intestine.
Muscular walls churn the food for up to 4 hours and break down food into even smaller substances. The stomach walls secretes gastric juice which contains protease[digest proteins] and renin[clot protein in milk from soluble to insoluble ; in children only]. Hydrochloric acid is secreted to provide the correct pH for protease to work and kill potentiallyharmful bacteria. After 4 hours, the chyme passes through the pyloric sphincter, which relaxes to allow food to enter the duodenum.

The duodenum receives bile(see below) and pancreatic juice from the pancreas. It also releases digestive juic from the walls which contain lipase and protease.

In the jejunum, the food received from the duodenum is digested.

finally in the ileum, absorption of digested food takes place through the finger like villi.
2) What does the bile do? And does it always store in the gall bladder?
Bile salts (alkaline) emulsify fats into tiny droplets [not a digestion process, just physically making the drops of fats smaller, something like chewing] and neturalizes acidic chyme from the stomach (the enzymes in the pancreatic juice requires an alkaline enviroment to work]
3) In the pancrease, contains pancreatic juice, and this helps in what area?
The pancreatic juice will help in digestion of undigested starch (Amylase+Starch=Maltose), Trypsin which help in the digestion of proteins (Trypsin+Protein=Polypeptide & Peptone), Erepsin (Erepsin+polypeptides=amino acids) and lipase which help in the digestion of fats (Lipase+Fats=Fatty Acids & Glycerol)
4) In the stomach, it digests proteins and the digestion for carbohydrate stops right? Then, in the small intestine, it digests the proteins, carbohydatres and fats as well with the help of different enzymes found in the small intestine, right?
Yes
5) What is:
- Metabolism?
The chemical processes occurring within a living cell or organism that are necessary for the maintenance of life.
- Defaecation?
The removal of undigested food (egestion)

Labels: