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Anatomy
Male
Surface Anatomy
Male
ext genitalia
Penis
Foreskin
Scrotum
Skin
Female
Surface Anatomy
Female
ext genitalia
Mons
Vulva
Breasts
Skin
Urogenital
System
Kidneys
Ureters
Bladder
Prostate
Urethra
Testicles
Vas deferens
Ductus
deferens
Seminal
vesicles
Ejaculatory
ducts
Uterus
Ovaries
Fallopian
tubes
Vagina
Skeletal
System
Head
Skull
Orbits
Mandible
Cranium
Zygomatic arches
Cheek bones
Scapula
Colar bone
Ribs
Vertebral column
Cervical vertebrae
Atlas
Axis
Thoracic vertebrae
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Sacrum
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Hip bone
Legs
Femur
Tibia
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Feet
Tarsals
Metatarsals
Phalanges
Arms
Humerus
Radius
Ulna
Hands
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Metacarpals
Phalanges
Muscular
System
Smooth
muscle
Heart
Tongue
Muscles
within arteries
Skeletal
muscle
Facial
muscles
Neck
Sternocleidomastoid
Chest
Pectoral
muscles
Pecs
Diaphragm
Stomach
Abdominals
Abs
Rectus abdominis
External oblique
Internal oblique
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Shoulders
Deltoids
Delts
Arms
Biceps
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Extensors
Flexors
Legs
Thigh
muscles
Quadriceps
Quads
Lower
leg muscles
Calves
Back
Trapezius
Traps
Latissimus dorsi
Lats
Erector spinae
muscles
Correct Posture
Cardiovascular
System
Heart
Vessels
Respiratory
System
Mouth
Pharynx
Larynx
Trachea
Lungs
Diaphragm
Digestive
System
Mouth
Pharynx
Esophagus
Stomach
Small
intestine
Large
intestine
Rectum
Anal
canal
Liver
Gall
bladder
Pancreas
Nervous
System
Nerves
Spinal
cord
Senses
Brain
Eyes
Ears
Nose
Tongue
Endocrine
System
Pituitary
gland
Thyroid
gland
Parathyroid
glands
Adrenal
glands
Pancreas
Testes
Ovaries
Lymphatic
System
Lymph
nodes
Spleen
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A coiled tube, representing the longest section
of the gut, averaging between 6 to 7 meters in length (19.7 to 23
feet), with an opening of 1 inch in diameter. Within this tube,
the final stages of digestion and most absorption take place. Here
carbohydrates, fats and proteins are broken down into smaller molecules,
which along with vitamins, minerals and water, are able to cross
the intestinal lining and walls of the blood vessels to enter the
blood. Efficient absorption is accomplished by the tremendous surface
area of the intestine. Not only is the intestine long, and coiled
together to fit within the abdomen, but the inner surface contains
many folds and ridges. In addition, the entire inner surface is
covered with tiny fingerlike projections called villi. In addition,
these villi are covered with even tinier fingerlike projections
called microvilli! All of these structures are supplied with capillaries
providing a massive surface for absorption. If the small intestine
was just a long coiled tube, it would have a surface area of 4 square
yards. Pretty big, eh? Not when you consider that the folds, ridges,
villi and microvilli produce a surface area of more than 250 square
yards! That's larger than a tennis court!
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The small intestine is composed of three sections...
Duodenum
The first, shortest, and widest section of the small intestine,
averaging about 25 cm long (9.8 inches), and almost entirely fixed
to the posterior body wall. The duodenum is the only section of
the small intestine that is somewhat adhered to the body wall. Food
from the stomach enters the duodenum through the pyloric sphincter.
The bile and pancreatic ducts empty into the duodenum as well. The
bile duct supplies bile from the gull bladder and liver, and the
pancreatic duct supplies digestive enzymes from the pancreas.

The duodenum is the second most common location
for ulcers in the digestive tract. 5 million Americans deal with
ulcers of either the stomach or duodenum every year. 10% of Americans
experience ulcers at some point in their lives. They are caused
by a bacterial infection. The bacteria, along with the natural enzymes
from the gut, eat away at the protective lining in the duodenum,
causing an open sore on the duodenum interior. Stress increases
stomach acid, which flows into the duodenum and increases vulnerability
to duodenal ulcers. Taking aspirin, or nonsteroidal anti-inflammatory
drugs over a long period of time can increase stomach acidity and
ulcer vulnerability. Steroids, genetics and alcohol can also increase
your risk. Smoking not only increases your risk, but also prevents
the healing of ulcers once they form! Dark green leafy vegetables
such as spinach can help prevent digestive problems. Blacks and
Latinos are twice as likely to develop ulcers than are Whites.
Jejunum
The second section of the small intestine, measuring about 2.4 to
2.8 meters (7.9 to 9.23 inches). It is often empty, and generally
thicker, more vascularized and thus more red than the ileum. Most
of the jejunum lies central around the umbilicus (belly button).
The inner mucus membrane is deeply folded for more absorbing surface
area than the ileum. Both the jejunum and ileum are suspended from
the posterior body wall by a thin vascularized two-layer membrane
called the mesentery.
Ileum
The third, final and longest section of the small intestine, averaging
about 3.6 to 4.2 meters in length (11.8 to 13.8 inches). Most of
the ileum lies below the jejunum just above the level of the genitals
and a slightly to your right side. Contents of the jejunum empty
into the cecum (the first part of the large intestine).

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- You consume 30 tons of food throughout your
life.
- It takes 24 hours to completely digest food.
- The digestive tube from your mouth to your
anus is 9 meters or 30 feet long.
- The digestive system has a surface area
of 2000 square feet.
- The surface area of the digestive system
is approximately equal to that of a single's tennis court!
- The average person eats 3 lbs. of food daily.
- Vomiting can empty the stomach along with
the first foot of intestines.
- Water molecules in the gut can move at 1500
miles/hour due to peristalsis.
- It takes 4 to 8 seconds for food to travel
to the stomach.
- Most absorption occurs within the first
quarter of the small intestine.
- The small intestine averages 21 feet long.
- The bacteria as it naturally exists within
the lumen (or hollow space) of the digestive tract is perfectly
harmless and beneficial, helping the digestion and absorption
of food that otherwise couldn't be absorbed. However, if this
bacteria ever did enter the body and the blood, due to a ruptured
digestive organ, it could be extremely harmful and even lethal.
- The lumen (contents) of the digestive tract
is considered outside the body like the hole of a donut, since
it's continuous with the outside of the body. The lungs and
kidneys eliminate most of the waste products from inside the body.
The digestive tract is disqualified from this function, since
most contents of feces never technically enters the body.

Nutrition
Fiber
Digestion
Other digestive organs
Mouth
Pharynx
Esophagus
Stomach
Large intestine
Rectum
Anal canal
Glands involved in digestion
Liver
Gall bladder
Pancreas
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