Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Journey Through the Digestive System by Praniti Agarwal

Science Project Grade 7 Mr Haugen
by

Praniti Agarwal

on 6 November 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Journey Through the Digestive System by Praniti Agarwal

The Digestive
System


Both ways of digestion include the breaking down of food into smaller parts so that the
absorption
of food can occur.
Chemical Digestion
Physical Digestion

Physical Digestion
is
the actual process of
breaking down the food
into smaller pieces and
particles inside your
mouth
.
Physical
digestion
is done by
using your
teeth
and
masticating (chewing)
your food.
Chemical digestion
is the
chemical breakdown of
food which then makes the
food that you digested
into simpler compounds.
The macro-nutrients are
broken down. These are
some examples:
Proteins
are broken down to
amino
acids
and
carbohydrates
are broken down into
simple sugars
(glucose).

Mouth
Liver
Gallbladder
Large Intestine
Esophagus
Stomach
Pancreas
Small
Intestine
Rectum
First...
Then...
Next...
Thereafter...
Finally...
I think that my meal choices fulfill all my body's needs, because 49% of my breakfast are carbohydrates, 25% are proteins and 25% are fats. Research shows that your meal should consist of 50% carbohydrate, 25% protein and 25% fat.

My total
calorie
intake of my breakfast is 1250.6 calories and that is healthy, because a teenagers meal should include 700-1400 calories.
Nutrients
A
balanced diet
consists of a wide range of nutrients,
minerals
and
vitamins
-nutrients are very important substances that our body needs for nourishment and development. They play a very important part in keeping are body healthy and helping our body grow and keeping it healthy.
Carbohydrates
Proteins
Fats
Vitamins
Minerals
Water
Fiber
Carbohydrates
are a very good source of energy. There are 2 kinds of
carbohydrates
- complex
carbohydrates
and simple
carbohydrates
. Complex
carbohydrates
usually consist of starchy foods where as simple
carbohydrates
are generally known as sugars. This is because
carbohydrates
can be converted into glucose. You shouldn't consume too many
carbohydrates
, because this could cause your
blood
sugar to rise.
You could say that
carbohydrates
acts like a car- without fuel the car won't run and without
carbohydrates
our body won't run.

P
Protein
is an essential nutrient that we need to

consume, because it's necessary for growth and maintenance of our body. It is a long chain of
amino acids
. Almost everything in our body can't function without
proteins

including our tissues and organs. There are 20 kinds of
amino acids
in our body and it's a mixture of essential amino
acids
(8) which help in maintaining healthy hair, skin and bones and non-essential
amino acids
(12). Some amino acids can also be
absorbed
straight into the muscle and then converted into energy. Foods with protein include meat, eggs, seeds, legumes, dairy and nuts.
Often people think that they should completely
remove
fat
from their diet, however
fat
is a very important nutrient and it helps the other nutrients function properly. It's extremely necessary for us to consume the right amount of
fat
, because it provides a normal body function and a healthy supply of energy, in fact without
fat
it is almost impossible for us to live. There are 4 kinds of
fat
Saturated, Trans, Polyunsaturated and Monounsaturated. Polyunsaturated and Monounsaturated
fats
are better for your body and help reduce the risk of heart failures and diseases. In comparison, saturated
fats
are less healthy and you should almost completely ignore trans
fats
.
.
Vitamins
are organic compounds which are necessary in small portions, as it is an incredibly important nutrient which your body can't produce enough of. There are 13 essential
vitamins
that you should definitely not avoid, these are
vitamins
A, 8 types of
Vitamin
B's, C, D, E and K. Each of these have a different role and task in your body and are all equally important. It coverts food into energy, keeps our cells healthy and helps enhance the immune system.
Vitamin
C (ascorbic acid) can be consumed in the form of citrus juice (lime or lemon) and your body can
absorb Vitamin
D by going in the sun.
When you hear the phrase
minerals
, you probably don't think about food, you normally think of rocks, iron etc. That is true, however there are some minerals which you can also find in your food, for example red meats contains quite a lot of iron.
Minerals
perform the same tasks as
vitamins
when it comes to helping our body. It helps your body grow, develop, build strong bones , transmitting nerve impulses and just simply keeping your body healthy. There are a lot of
minerals,
but only some help in maintaining a healthy heart beat.
It is very important to consume water in our daily lives. If you avoid food in your daily lives, you can still survive, however if you don't drink enough
water
it's nearly impossible for you to survive. Water is a very important substance that is needed in our digestive system, because it removes toxins and waste from our body, this is why the more
water
that you drink the color of your urine tends to be clearer. It also helps to make necessary body fluids. Did you know that our body is made of 75% water? The sign which used to describe
water
is H2O which is made with 1 oxygen (O) and 2 hydrogen (H2).
Fiber
is a very important element in plants for example fruits, vegetables and whole grains.
Fiber
is different to all the other nutrients that we either digest or
absorb
, but
fiber
is a nutrient which we don't digest.
Fiber
isn't broken down and is usually intact and passes quickly through the digestive system. If you don't consume enough
fiber
in your regular diet, you will face several symptoms like constipation and sluggishness.
Fiber
helps to prevent colon cancer and keeps your colon clean. Did you know that
fiber
can even help with weight loss because it makes you feel full in your intestine, which makes you eat less?
What is the difference between physical and chemical digestion?
Tortilla Chips
Tortilla chips contain a lot of carbohydrates and dietary fiber it also contains a little bit of protein and fat.

Monterey Cheese
The Monterey Cheese is a healthy dressing used in breakfast nachos. It contains a lot of protein and a lot of fat, even though there is a lot of fat it's still healthy for you as it provides your body with energy.
2 Large eggs
These eggs are a good source of protein and
cholesterol
, but it contains a little bit of fat.
Guacamole
Guacamole is mostly made with avocado and a little bit of vegetables. It's a good source of fiber, vitamins and minerals.
Nachos Dressing
The nachos dressing consists of olives, jalapenos, black beans and salsa sauce with vegetables which all contain a lot of vitamin and minerals.

BREAKFAST NACHOS
APPLE
This apple contains a lot of carbohydrates- around 96% of the apple. It also contains Vitamin C and Vitamin A. There is also a little bit of iron and calcium.

Low fat Vanilla Yogurt
This creamy mango contains low fat vanilla yogurt. It's very healthy, because it contains a lot of calcium, protein and carbohydrates. Also, since it's low fat not fat free, it contains a little bit of fat and
cholesterol
.
Soy milk
The soy milk contains a lot of magnesium, Vitamin B-6, Iron, Protein and Carbohydrates. It also includes a little bit of polyunsaturated and
monounsaturated fat
which are considered
to be the 'good'
fats
Mango
Mangoes contain loads
of vitamin C, a lot of Vitamin A, Vitamin B-6, Carbohydrates and potassium.It also contains a little bit of protein and fat.
CREAMY MANGO
SMOOTHIE
COTTAGE CHEESE
In cottage cheese more than 50% of it is protein, there is also quite a lot of carbohydrates and a little bit of fat. It also contains calcium and a little bit of Vitamin B-12.
Fun Fact:
In India, cottage cheese is
very famous. It is called
paneer and when it's eaten
it's often mixed with other
vegetables and/or gravy .
MY MEAL
After ...
Then...
The Digestive System
The process of the
digestive system
begins in the
mouth
. Your teeth cuts up the food that you eat into relatively small pieces so that it makes it possible to digest. After that happens, saliva is produced in the
salivary glands
and gets mixed with the food in your mouth. In your saliva, there are chemicals called
enzymes
that help in breaking down the starches in your food. There is an
enzyme
in your saliva called the
amylase
which breaks down the starch into sugars.
The process in which our food goes down the
esophagus
is called peristalsis. This process uses layers of muscle in your
esophagus
and intestines. They move in a wave motion and push the food down the
esophagus.
The
esophagus
is basically a tube which transports the food that we swallow into the stomach. In the root of our tongue, there are two tubes- the wind pipe which leads to the lungs and the
esophagus
which leads to the stomach. When we talk, the
epiglottis
(a flap of cartilage) covers the
esophagus
and when we eat the
epiglottis
covers the trachea (windpipe) so that our food doesn't go to our lungs. That's why when people eat while talking, their food often goes down the wind pipe and in order to get the food back into the mouth they cough
it out from the windpipe.
When the food goes down the
esophagus
, the
next stop is the
stomach
. The
stomach
specializes in digesting and breaking down food particles into
miniscule pieces by using chemicals inside the
stomach.
These chemicals are called gastric juices- they contain
hydrochloric acid
(pH 2) and
enzymes
which help break down food. This process in which the food is mixed with chemicals in our
stomach
last for 3-4 hours. After this happens, the result is chyme, a cream like liquid substance. Unfortunately, the substance is not small enough to go into our
blood
stream and still hasn't provided the body with any useful nutrients like
protein
. Next, this substance
gets pushed down through the valve at
the end of
stomach
to the
liver
.
When the food particles go through the
stomach
valve, it moves to the
liver
. In the liver, an alkaline chemical called
bile
is produced.
Bile
is stored in the gall bladder which mixes the
bile
with our food.
Bile
specializes in breaking down
fat
such as butter and cheese. Since
bile
is an alkaline there is now too much alkaline so an acidic substance, lipase is added to break down the fat further and to neutralize the
bile
. The result of this are
fatty acids
which are small enough to be absorbed in our
blood

stream.
The
small intestine
is probably the most important part of the
digestive system
. The
small intestine
is not very small, did you know that it is actually 18 feet long? While the food goes through the intestine, it is mixed with new digestive chemicals and then eventually provides what we need in our body depending on what we eat. Lining the
small intestine
, there are thousands of finger like
villi
. In a villus, there are capillaries which help in absorbing the smaller food molecules to send to our body through our
blood
.
Anything the body doesn't use gets sent to the
large intestine
. The main job of the large intestine is to send the water back to the blood stream, because water was necessary in the process of digestive system but now it isn't needed anymore. The food stays in the large intestine for roughly 12 hours and then anything that didn't get digested moves to the
rectum
.
The
feces
(undigested food) goes through the
anus
and leaves the body, because it isn't needed.
Wait!
The
appendix
is not required in our body as it doesn't make a difference whether it's there or not. That's why some people choose to remove it and some people just have to remove it, because it gets inflamed or swelled up.
Appendix
Pancreas
The
pancreas
helps in breaking down
carbohydrates
and
protein
using it's digestive juice. Did you know that the
pancreas
is both endocrine and exocrine? It is endocrine because it release juices straight into our
blood
stream and, it is exocrine because it releases some of the juices into ducts.
Thank you for
watching!

http://www.netdoctor.co.uk/focus/nutrition/facts/lifestylemanagement/carbohydrates.htm
http://library.thinkquest.org/15873/kitchen/eatingright/nutrients.shtml
http://www.myfitnesspal.com/nutrition-facts-calories/nachos
http://www.aminoacid-studies.com/
http://www.medicalnewstoday.com/articles/141442.php
http://www.medicalnewstoday.com/articles/10011.php
http://www.healthykids.nsw.gov.au/recipes/facts-about-fats.aspx
http://www.medicalnewstoday.com/articles/195878.php
http://www.centrum.com/expert-corner/why-are-vitamins-important
http://www.doctoroz.com/blog/jodi-sawyer-rn/why-fiber-so-important
http://www.tastespotting.com/features/breakfast-nachos-recipe
http://caloriecount.about.com/calories-tortilla-chips-i19056
http://www.fatsecret.com/calories-nutrition/generic/egg-whole-raw
portionid=11206&portionamount=2.000
http://www.fatsecret.com/calories-nutrition/generic/guacamole?portionid=20372&portionamount=0.250
http://nutritiondata.self.com/facts/fruits-and-fruit-juices/1809/2
http://www.bettycrocker.com/recipes/creamy-mango-smoothies/570dcfa7-20ca-4b75-912f-294bbb0f9205
http://caloriecount.about.com/calories-yogurt-vanilla-low-fat-11-i1119
http://www.google.com/#q=nutrition+facts+about+mangoes
http://oklahoma4h.okstate.edu/health/digest.pdf
http://en.wiktionary.org/wiki/villi
Bibliography
[Where you see there are voice recordings so make sure you don't miss them!]
Full transcript