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Guiding Questions Worksheet – Bill Nye “Digestion”
1.
Why is the inside of the digestive system not really “inside” your body?
Technically, due to the digestive system being one long tunnel that runs from
your mouth
to your anal canal and doesn’t need to be cut open to be reached, it is
therefor the
outside of your body.
2.
What is the function of food to the human body?
Food contains all necessary nutrients for our body. These nutrients help the
body to do
all the day-to-day activities. Nutrients help the brain to develop, thus
helping the brain to
give command to the body to work.
3.
What chemical reaction gets energy from the food you eat? What other element
is
combined with the food to release the energy?
a. Respiration
b. Oxygen
4.
When we eat food, what are the first three organs that it passes through?
* Oral cavity (mouth)
* Esophagus
* Stomach
5.
When your stomach “growls”, what is it trying to tell you?
That it is empty and needs something to digest.
6.
How is the food in a stomach broken down into simpler substances? What
chemicals
help this process?
a. Churning is another type of movement that takes place in the stomach and
this mixes
up the food with the gastric juices.
b. Gastric juice is secreted from the linings of the stomach walls, along
with various
digestive enzymes.
7.
Why does the acid in your stomach not eat through the stomach lining?
Gastric juice is secreted from the linings of the stomach walls, along with
mucus, which
helps to protect the stomach lining from the action of the acid. The 3 layers
of powerful
stomach muscles churn the food into a fine semiliquid paste called chyme.
8.
About how much food and water does the average person eat and drink per day?
a. Adult Men about 4 L per day and adult Women about 3 l per day.
b. Food varies on culture, age, activity level and gender: see below
c. According to B. Nye, about 1 kg of food (??)
Gender
Age
(years)
Sedentaryb
Moderately Activec
Actived
Child
2-3
1,000
1,000-1,400
1,000-1,400
Female
4-8
9-13
14-18
19-30
31-50
51+
1,200
1,600
1,800
2,000
1,800
1,600
1,400-1,600
1,600-2,000
2,000
2,000-2,200
2,000
1,800
1,400-1,800
1,800-2,200
2,400
2,400
2,200
2,000-2,200
Male
4-8
9-13
14-18
19-30
31-50
51+
1,400
1,800
2,200
2,400
2,200
2,000
1,400-1,600
1,800-2,200
2,400-2,800
2,600-2,800
2,400-2,600
2,200-2,400
1,600-2,000
2,000-2,600
2,800-3,200
3,000
2,800-3,000
2,400-2,800
These levels are based on Estimated Energy Requirements (EER) from the
Institute of Medicine Dietary Reference
Intakes macronutrients report, 2002, calculated by gender, age, and activity
level for reference-sized individuals.
"Reference size," as determined by IOM, is based on median height and weight
for ages up to age 18 years of age
and median height and weight for that height to give a BMI of 21.5 for adult
females and 22.5 for adult males.
a
b
Sedentary means a lifestyle that includes only the light physical activity
associated with typical day-to-day life.
Moderately active means a lifestyle that includes physical activity
equivalent to walking about 1.5 to 3 miles per day
at 3 to 4 miles per hour, in addition to the light physical activity
associated with typical day-to-day life
c
Active means a lifestyle that includes physical activity equivalent to
walking more than 3 miles per day at 3 to 4
miles per hour, in addition to the light physical activity associated with
typical day-to-day life.
d
9.
How does the mouth start the process of digestion?
The mouth releases saliva that contains digestive enzymes and the tongue and
teeth
move the food around and grind it up into smaller pieces thus increasing the
surface
area.
10.
How long is the small intestine in adults and children?
The small intestine is about 6-7 meters long. It has a surface area of about
30 meters
square!
11.
How long is the large intestine?
About 1.5 – 2 meters
12.
How long does it take food to travel through the digestion system?
About 12 hours to 2 days
13.
Can you swallow food when hanging upside down? What is the name of the
process that
pushes food down the esophagus?
Yes; peristalsis
14.
What is the name given to the mix of broken down food and water in the
stomach
and small intestine? What does the digestive system add to the consumed food
and
water?
Chyme; various enzymes, acid, digestive fluids (gastric fluids)
15.
What is the name of the valve between the stomach and small intestine that
controls
when food passes out of the stomach?
The pyloric valve.
16.
What is the function of the large intestine?
The main function of the large intestine is to absorb water. The area of the
human, adult
large intestinal mucosa is about 2 m2
17.
In what organ is the waste from the digestion process collected for eventual
disposal?
The rectum acts as a temporary storage site for feces.
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The Digestive System
Microsoft Word - GQW-BillNye
Digestion.doc
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