The Human Body - Digestive, Lymphatic, Endocrine, & Urinary Systems Flashcards
The digestive system is also called ___
The gastrointestinal system
Parts of the digestive system
- Gastrointestinal tract (stomach & intestines)
- Mouth
- Salivary glands
- Pharynx
- Esophagus
- Liver
- Gallbladder
- Pancreas
- Rectum
- Anus
Function of the digestive system
Process food to nourish the individual cells of the body
___ create the boundary of the abdomen
- Thick muscular abdominal walls
- Diaphragm
- An imaginary plane that extends from the pubic symphyses through the sacrum
Where do the quadrants of the abdomen intersect?
At the umbilicus
RUQ major organs
- Liver (Fills the entire anteroposterior depth of the abdomen in this quadrant)
- Gallbladder
- Portion of the colon
- Most of the liver (almost entirely under the protection of the 8th to 12th ribs)
LUQ major organs
- Stomach (may sag well down into the LLQ when full)
- Spleen (almost entirely under the protection of the left rib cage. Lies in the lateral and posterior portion of this quadrant, under the diaphragm and immediately in front of the 9th to 11th ribs)
- Portion of the colon
The spleen is frequently injured when the ___ ribs are fractured
9th to 11th
RLQ major organs
- Two portions of the large intestine (cecum & ascending colon)
- Appendix (attached to the lower border of the cecum)
LLQ major organs
- Descending and the sigmoid portions of the colon
The small intestine occupies ___
The central part of the abdomen around the umbilicus in all four quadrants
The pancreas lies ___
Behind the abdominal cavity on the posterior abdominal wall in both upper quadrants
The large intestine traverses the abdomen, beginning in ___ and ending in the ___ as it passes through ___
- RLQ
- LLQ
- All four quadrants
The urinary bladder lies ___
Just behind the pubic symphysis in the middle of the abdomen, in both lower quadrants and in the pelvis
The kidneys and the pancreas are called ___ because they ___
- Retroperitoneal organs
- Lie behind the abdominal cavity
The retroperitoneal organs are located ___
Above the level of the umbilicus, extending from the 11th rib to the 3rd lumbar vertebra on each side
Kidney size and location
About 5” (13 cm) long and lie just anterior to the costovertebral angle, which is the junction between the posterior aspect of the lower portion of the rib cage and the spine
Parts of the mouth
- Lips
- Cheeks
- Gums
- Teeth
- Tongue
The roof of the mouth is formed by ___
The hard and soft palates
The hard palate is ___
A bony plate lying anteriorly
The soft palate is ___
A fold of mucous membrane and muscle that extends posteriorly from the hard palate into the throat
Purpose of the soft palate
Designed to hold food that is being chewed within the mouth and to help initiate swallowing
Location of the salivary glands
- One set on each side of the mouth under the tongue
- Other set is in front of each ear
The salivary glands produce ___ of saliva daily
About 1.5 L
Saliva is made of ___
- 98% water
- 2% mucus, salts, and organic compounds
Saliva serves as ___
A binder for the chewed food being swallowed and a lubricant within the mouth. Also contains certain digestive enzymes
An automatic movement of the pharynx during swallowing lifts the ___ to permit the epiglottis to close over it so that liquids and solids are ___
- Larynx
- Moved into the esophagus and away from the trachea
What is the esophagus?
A collapsible tube about 10” (25 cm) long that extends from the end of the pharynx to the stomach
Where is the esophagus located?
Lies just anterior to the spinal column in the chest
___ of the esophagus propel food through it to the stomach
Contractions of the muscle in the wall
Stomach location
LUQ, largely protected by the lower left ribs
How does the stomach digest food?
Muscular contractions in the wall of the stomach and gastric juices, which contain lots of mucus, convert food to chyme
The stomach produces ___ of gastric juice daily
About 1.5 L
The function of the stomach
Receive food in large quantities intermittently, store it, and provide for its movement into the small bowel in regular, small amounts
How long for one meal to pass through the stomach
1 to 3 hours
First part of the small intestine
Duodenum
Location of the pancreas
Lies below and behind the liver and stomach and behind the peritoneum. Firmly fixed in position, deep within the abdomen
The two portions of the pancreas are ___
Intertwined
Two kinds of glands in the pancreas
- Exocrine
- The islets of Langerhans
The exocrine secretes ___
Nearly 2 L of pancreatic juice daily
Pancreatic juice contains ___
Many enzymes that aid in the digestion of fat, starch, and protein
Pancreatic juice flows directly into the ___
Duodenum through the pancreatic ducts
The islets of Langerhans is ___
Endocrine
The islets of Langerhans produce ___
Insulin and glucagon (hormones)
Purpose of insulin and glucagon
Regulate the amount of glucose in the blood
Largest solid organ in the abdomen
Liver
Liver location
Most of the area immediately beneath the diaphragm in the RUQ and also extends into the LUQ
Function of the liver
- Poisonous substances produced by digestion are brought to the liver and rendered harmless
- Factors that are necessary for blood clotting and for the production of normal plasma are formed here
- Produces .5 to 1 L of bile daily to assist in the normal digestion of fat
- Primary organ for the storage of sugar or starch for immediate use by the body for energy
- Produces many of the factors that aid in the proper regulation of immune responses
All the blood that is pumped to the gastrointestinal tract passes into the liver through the ___ before it returns to the heart
Portal vein
Approximately ___ of the cardiac output of blood passes through the liver each minute
25% (1.5 L)
The liver connects with the intestine by way of the ___
Bile ducts
The gallbladder is ___
A small pouch extending from the bile ducts that serves as the reservoir and concentrating organ for bile produced in the liver
Together the bile ducts and the gallbladder form the ___
Biliary system
Function of the gallbladder
Discharges stored and concentrated bile into the duodenum through the common bile duct
The presence of food in the duodenum triggers a ___
Contraction of the gallbladder to empty it
The gallbladder usually contains about ___ of bile
About 60 to 90 mL
The cells lining the small intestine produce ___
Enzymes and mucus to aid in digestion
Enzymes from the ___ carry out the final processes of digestion
Pancreas and the small intestine
___ are absorbed across the wall of the lower end of the small intestine into veins to be transported to the liver
More than 90% of the products of digestion (amino acids, fatty acids, simple sugars), together with water, injected vitamins, and minerals
Parts of the small liver
- Duodenum
- Jejunum
- Ileum
Length of the duodenum
About 12” (30 cm) long
Part of the small intestine that receives food from the stomach
Duodenum
Here food is mixed with secretions from the pancreas and liver for further digestion along with bile from the liver and gallbladder
Duodenum
Color of bile
Green-black, gives feces its brown color
Major function of bile in digestion
Digestion of fat
The jejunum and ileum together measure ___
More than 20 feet (6 m) on average
Parts of the large intestine
- Cecum
- Colon
- Rectum
Length of the large intestine
About 5 feet (1.5 m) long
Large intestine location
Encircles the outer border of the abdomen around the small bowel
The portion of the large intestine that extends from the cecum to the rectum
Colon
Function of the colon
Absorb the final 5% to 10% of digested food and water from the intestine to form solid stool
Stool is stored in the ___
Rectum
Stool is passed out the ___
Anus
The appendix opens into the ___
Cecum
The rectum and anus are supplied with ___ that control, voluntarily and automatically, the escape of liquids, gases, and solids from the digestive tract
A complex series of circular muscles called sphincters
Path of the nutrients from the intestines
- Through the walls of the intestines
- Portal vein to liver
- Processed, stored, and transported to the heart through veins
- Pumped to the capillaries
- Delivered to the individual cells
Without eating or drinking, ___ of fluid is secreted daily into the gastrointestinal tract
8 to 10 L
The fluid secreted into the gastrointestinal tract comes from ___
- Salivary glands
- Stomach
- Liver
- Pancreas
- Small intestine
In a healthy adult, about ___ of the body weight is delivered as fluid daily to the gastrointestinal tract
7%
Parts of the lymphatic system
- Spleen
- Lymph nodes
- Lymph
- Lymph vessels
- Thymus gland
- Other component
The lymphatic system supports ___
Both the circulatory system and the immune system
The lymphatic system has no pump and relies on ___ for lymph to flow
Muscle contractions and movements of the body
Flow of lymph
From lymph tissue into the central venous circulation via the thoracic duct
Lymph vessels form a ___
Network throughout the body
Together with the circulatory system, the lymphatic system helps to ___
Rid the body of toxins and other harmful materials
The spleen also plays an important role in the body’s ___ function
Immune
The spleen houses ___ that help eliminate infectious agents
Immune cells
The brain controls the endocrine system using ___
Hormones
Endocrine glands release their hormones directly into the ___
Blood stream
Each endocrine gland produces ___
One or more hormone
Each hormone has a specific effect on some ___
Organ, tissue, or process
The brain controls the release of hormones by the ___
Endocrine glands
Type I diabetes mellitus is a ___
Common endocrine condition
Hormone produced by the adrenal gland
Epinephrin, norepinephrine, cortisol, and others
Hormone produced by the ovaries
Estrogen and others
Hormone produced by the pancreas
Insulin, glucagon, and others
Hormone produced by the parathyroid
Parathyroid hormone
Hormone produced by the pituitary gland
Multiple, controls other endocrine glands
Hormone produced by the Testes
Testosterone and others
Hormone produced by the thyroid
Thyroxine and others
Location of adrenal gland
Above the kidneys
Location of the ovaries gland
Female pelvis (two glands)
Location of the pancreas gland
Retroperitoneal space
Location of the Parathyroid gland
Neck (behind and beside the thyroid) (3 to 5 glands)
Location of the pituitary gland
Base of the skull
Location of the testes
Male scrotum (two glands)
Location of the thyroid gland
Neck (over the larynx)
Function of epinephrine, norepinephrine, cortisol, and others
Stress response, fight-or-flight reaction
Function of estrogen and others
Regulate sexual function, characteristics, and reproduction
Function of insulin, glucagon, and others
Regulates glucose metabolism and other functions
Function of parathyroid hormone
Regulates serum calcium
Function of pituitary gland
Regulates all other endocrine glands
Function of testosterone and others
Regulate sexual function, characteristics, and reproduction
Function of thyroxine and others
Regulates metabolism
Primary fuel for the body
Glucose
Responsible for rapidly moving glucose into cells
Insulin
Functions of urinary system
- Control fluid balance in the body
- Filter and eliminate wastes
- Control pH balance
Kidney location
Two that lie on the posterior muscular wall behind the peritoneum in the retroperitoneal space
Kidney function
Rid the blood of toxic waste products and control its balance of water and salts
Nearly ___ of the output of blood from the heart passes through the kidneys each minute
20%
Large vessels attach the kidneys directly to the ___
Aorta and the inferior vena cava
Waste products and water are constantly filtered from the blood to form ___
Urine
The kidneys continuously concentrate this filtered urine by ___
Reabsorbing the water as it passes through a system of specialized tubes within them
The tubes in the kidneys unite to form the ___
Renal pelvis
Ureter location
Passes from the renal pelvis of each kidney along the surface of the posterior abdominal wall behind the peritoneum to drain into the urinary bladder
Ureter diameter
0.2” (0.5 cm)
The ureters are ___
Small muscular tubes
Urinary bladder location
Immediately behind the pubic symphyses in the pelvic cavity
The urinary bladder is composed of ___
Smooth muscle with a specialized lining membrane
The ureters enter the bladder ___
Posteriorly at its base on either side
A healthy adult forms ___ of urine a day
1.5 to 2 L
The waste urine is extracted and concentrated from the ___ of blood that circulated through the kidneys daily
1500 L