Gastro-intestinal system Flashcards
Week 6
How much of a person’s blood circulating volume is around the gut?
1/3 of blood volume
What is the name of the inner most layer of the GI tract?
Mucosa (mucus membrane)
What is the second innermost layer of the GI tract called?
Submucosa
What is the second outer most layer in the GI tract called?
Muscular layer
What is the outer most / superficial layer of the GI tract called?
Serosa (serous layer)
Define peristalsis
It is the involuntary muscle movement that occurs in the digestive system
What is fluid accumulation in the peritoneal cavity known as?
Ascites
What is the mesentery?
A fold of the peritoneum that is and fan shaped binds the small intestine to the posterior abdominal wall
What is the mesocolon?
Fold of peritoneum that binds large intestine to the posterior wall
Define mastication
Chewing, crushing & breaking into smaller fragments
What is the role of motor neurons in the digestive system?
Controls motility and secretion by epithelial cells
What is the role of the sensory neurones in the digestive system?
Chemoreceptors and stretch receptors
What is the link between the GI system and the autonomic nervous system?
- Parasympathetic stimulation via the vagus nerve increases GI secretion and motility
- Sympathetic stimulation decreases GI secretion and motility
List the digestive organs
- Mouth
- Oesophagus
- Stomach
- Pancreas
- Liver
- Gallbladder
- Small intestine
- Large intestine
