Unit 3.1.5 The Gut-Brain Axis

Question 1

Gut-brain axis

Answer 1

• Connection between the CNS and the enteric NS
• Enables bidirectional communication
• Between the brain and the gastrointestinal tract (gut)

Question 2

Vagus nerve

Answer 2

• Nerve that connects brain (CNS) to organs within the autonomic NS
• Via nerve fibres that directly link organs such as the lungs, heart, oesophagus + intestinal tract

Question 3

What does the vagus nerve control?

Answer 3

Many crucial bodily functions including:
- Mood
- Immune response
- Digestion
- Heart rate

Question 4

Enteric nervous system

Answer 4

• Subdivision of autonomic NS
• Consists of nerve cells lining the gastrointestinal tract
• Controls digestive system

Question 5

Role of enteric NS

Answer 5

• Coordinates rhythmic muscle contractions that move material along digestive tract
• Interacts with immune system
  Regulates:
• Gastric acid secretion
• Changes in local blood flow
• The release of gut hormones

Question 6

Gut

Answer 6

• The gastrointestinal tract or long tube
• Starts at the mouth
• Ends at the anus

Question 7

Gut microbioata

Answer 7

The microbe population found in the gut (digestive system)