Liver Flashcards
Liver
- The liver is the largest gland in the body and can weigh up to 2.3kg in the adult, and is described as having two lobes.
- Following absorption in the small intestine the nutrient rich blood passes via the Portal vein to the liver
•Blood leaves the liver via the Hepatic veins, which almost immediately enter the inferior vena-cava
The liver has many functions, those which are associated with the digestive process include
The liver has many functions, those which are associated with the digestive process include
- Conversion
- Breakdown
- Production
- Secretion
- Storage
- Synthesis
- metabolism
Conversion of excess amino acids to urea
Conversion of excess glucose to glycogen
Breakdown of stored fat, for use by the body tissues to produce energy
Production of heat
Secretion of bile
Storage of vitamins A,D,E,K,B12, iron and copper
Synthesis of plasma proteins, including blood clotting factors
Inactivation of drugs and hormones
Metabolism of alcohol
Functions of Liver
S G - Conversion of excess glucose to glycogen
T I - Iron and copper
O V - Storage of vitamins A,D,E,K,B12,
R E - Breakdown of stored fat, for use by the S body tissues to produce energy
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Produces H - Production of heat
U - Conversion of excess amino acids to urea
B - Secretion of bile
•dures
DESTORYS P – Breaks down poisons
A - Metabolism of alcohol
D - Inactivation of drugs and hormones
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•Synthesis of plasma proteins, including blood clotting factors
Pancreas
•The pancreas is situated posterior to the stomach and anterior to the abdominal aorta and inferior vena cava
•
•It has two main functions………
Functions of pancreas
- Production of pancreatic juice which is secreted into the duodenum via the pancreatic duct
- •Realses Glucogon
- Production of insulin :- Insulin is a hormone produced by specialised cells in the pancreas called the “Islets of Langehans”
glucose blood stream
glycogen stores liver
glcogon realsed from pancreases
glcolysis
Peritoneum
•A serous membrane which lines the abdomen and covers the abdominal organs
•
•It prevents friction as the organs move against each other and helps to keep them in position
Organs covered by the peritoneal lining
- Spleen
- Liver
- Stomach
- Gall bladder
Bowel
Other Abdominal and Pelvic Organs
- Spleen – peritoneal
- Kidneys – retroperitoneal
- Bladder and Ureters - retroperitoneal
- Urethra – pelvic abdomen
- Ovaries, Uterine tubes and Uterus [female] - pelvic
Spleen
•Lies in the left hypochondrial region of the abdominal cavity, between fundus of the stomach and the diaphragm
•
•Size varies but usually approx. 12cm long, 7cm wide and 2.5cm thick
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•Weighs approx. 200g
Functions of the Spleen
- Produce new leucocytes (white blood cells) and lymphocytes
- Store erythrocytes (red blood cells)
- Destroy old red blood cells
regions of adominal
Pancrease
12-15cm long
Produces and releases
- Digestive enzymes into the duodenum via pancreatic duct (exocrine function)
- Insulin and Glucagon directly into the blood (endocrine function)
Contains specialised endocrine cells called ‘Islets of Langerhans’ which contain 4 types of hormone secreting cells
Islets of Langerhans
- Alpha Cells – secrete the hormone Glucagon which raises the blood glucose levels
- Beta Cells - secrete the hormone Insulin which lowers blood glucose level by allowing it to pass into the cells that need it.
- Delta Cells – secrete growth hormone inhibiting cells (GHIH) or somatostatin, inhibiting secretion of Insulin and Glucagon
- F – Cells – secrete pancreatic polypeptide which regulates digestive enzymes
INSULIN
A naturally produced hormone
Insulin is released in response to rising blood glucose levels
Insulin is required to ‘unlock’ the cells to allow the glucose to enter and be transformed into energy.
Also converts excess glucose to glycogen for storage in the liver. This is called glycogenesis.
