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Digestive Prezi

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Torri Livingstone

on 23 April 2010

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Transcript of Digestive Prezi

Double click anywhere & add an idea The macronutrients consists of
carbohydrates, fats and protein.
The dietary intake values for
carbohydrates is 45- 65%, fats
20- 35%, and protein 10- 35% of
our calorie intake.

Essential nutrients are nutrients the
body cannot make or make enough of to
meet our recommendations. Carbohydrates consist of all whole grains,
vegetables, legumes, fruits, all plant foods,

Simple Carbs -> the sugars

Complex Carbs -> starches and fibers
Monosaccarides => glucose, fructose, galactose

Disaccharides => maltose (glucose, glucose)
sucrose (glucose, fructose)
lactose (glucose, galactose) Carbohydrate Digestion

The salivary amylase enzymes in the mouth partially breakdown some of the starch before it reaches the small intestine.

The stomach denatures the salivary amylase. Which means there is no digestion in the stomach because of the acidic-hydrochloric acid. Small Intestine:
The pancreatic enzymes digest
the starch to dissacharides.
The dissacharidase enzymes on
the surface of the intestinal
wall split dissacharides to

The monosaccharides enter the
capillary, the capillaries deliver
monosaccarides to the liver.

The Liver converts galactose and
fructose to glucose. It is then
stored as glycogen ( stored term
for glucose ).
Starting CHO Enzyme Product

starch + pancreatic amylase = multose

maltose + maltase = glucose + glucose

sucrose + sucrase = glucose + fructose

Lactose + lactase = glucose = galactose
Proteins are made from monomers
called Amino Acids. There are 20
Essential Amino Acids. The structure
is as follows, a central carbon atom
with a hydrogen atom, with an amino
group and an acid group, denaturation
means a change in a proteins shape. Proteins are crushed and moistened in the
mouth, but digestion mainly begins in the stomach.
In the stomach hydrolysis occurs. Hydrochloric
acid denatures, or uncoils, each of the
proteins tangled strand so that digestive
enzymes can attack peptide bonds. Hydrochloric acid also converts to
inactive persinogen to pepsin (hydrolizes
protein) which changes proteins into smaller
polypeptides and amino acids. In the small intestine pancreatic
and intestinal proteases hydrolyze
them into short and peptide chains.

Peptidase enzymes on the membrane surface
of the intestinal cell split most of the
dipeptides and tripeptides into single
amino acids.

There are only a few peptides that escape
digestion and enter into the blood intact. Fat Digestion

A majority of fat digestion occurs in the small intestine.A triglyceride enters the small intestine and then the liver secretes bile to emulsify the fat droplets.Bile is stored in the gallbladder.
Lipases are the enzymes that break down fat.These are secreted via the pancreas.A micelle is formed by bile salts and they help remove the end products of fat digestion.Excess fat is then stored in adipose tissue.

Liproteins transport fat around the body. There are four differernt lipoproteins.(chylomicron,low density-LDL, high density-HDL and very low density- VLDL). High density lipoproteins prevent heart attacks by carrying cholesterol away from the arteries and back to the liver. extracellular digestion- a form of digestion
wherein the breaking down of materials
into smaller absorbable components, takes place
outside the cell.

intracellular digestion- a form of digestion wherein
breaking down of materials into smaller absorbable
components, takes place inside the cell. digestion- mechanical and chemical
breakdown of food into smaller components
that can be absorbed in the blood stream. Disclosure 1 Questions

Why did Kim tell her brother that he was
going to get sick after eating the raw pork?

Kim probably told her brother that he would
become ill after eating the raw pork because
a majority of uncooked meat can have serious
affect on anyone. No one knows when a piece of meat
has become contaminated, but why take that risk? Raw
meet has high chances of attracting food born parasites.
We cook meat to a certain temperature to kill any bacteria
that it may have consumed.
Disclosure 2 Questions
1. What may have caused James to be sick,
according to the symptoms?

James may have gotten sick because raw pork
may contain worms and parasites. The meat may
have been contaminated while it was being
slaughtered. You are always supposed to cook meat
to a certain temperature because this will kill any
bacteria before the meat is eaten. If it is a case
of pork worm or parasite, it will live on the food
in the digestive system. Food poisoning may cause the
sympoms that James had which were fever, diarrhea and
stomach cramps. 2. Once you have determined a cause, explain
what effect(s) this would have on his body.

I believe that James must have got food poisoning
from eating the raw pork.When the body sees something foreign
or unusual enter it, such as bacteria in this case, it sets
up it's defenses. The body wants to get rid of this bacteria, so it sends white blood cells in to fight the infection. This causes an increase in body temperature, or fever. The diarrhea is the mechanism that intestines use to get rid of the infection, that is flushing it out. This is caughing the body to get rid of too much H2O over a small time period,causing the body to also become dehydrated. References
Nutrition 120 (class notes)

Understanding Nutrition Text. Leonard A. Piche
Copyright 2008 by Nelson Educated Limited.

Kinesiology 121 (class notes)


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