Lecture notes
Digestion physiology lecture notes
- Module
- Physiology (BM4MAP)
- Institution
- Aston University, Birmingham (Aston)
in depth digestion notes written by me
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
Saliva production is continuous secretion under autonomic nervous systemNot essential for digestion, needed for speech, chewing + swallowing.
Can be controlled by simple and conditioned reflexes.
Simple reflex
when chemoreceptors and pressure receptors when oral cavity respond to presence of food
initiates impulses via afferent nerve to salivary centre in medulla
Conditioned reflex
occurs unhat ora simulation, just thinking/ seeing/ smelling food causes salvation -This
activates cerebral cortex which then activates salivary centre in medulla.
Both reflexes cause autonomic nerves to be innervates which stimulates the salivary glands
and therefore production of saliva
The sublingual, the submandibular and the parotid glands produce saliva.
Both parasympathetic and sympathetic control saliva production. Not antagonistic like
elsewhere in body so they were together
Autonomic control of saliva production
Parasympathetic (chlorogenic)
- Innervated by medulla.
- Increases production of watery saliva- mouth watering
- Main control of saliva- dominant
1. Sympathetic (noradrenergic)
- Innervation from superior cervical ganglion
- Increase production of thick mucus saliva
- Dry mouth
- Eg in stressful situations.
Swallowing
- Voluntarily initiated followed by reflex.
- Reflex triggered by pressure receptors in pharynx.
- Controlled by swallowing centre in medulla.
- Highly complex, involved 31 pair of muscles.
3 stages of swallowing
1. Oral/Oropharyngeal stage
- Once the food is chewed into a bolus
- Voluntary swallowing is initiated by pushing the tongue against the hard palate.
- The bolus is pushed to the back to pharynx.
- The ovula is elevated and lodges at the back of the throat to seal off nasal passage.
- Food is prevented from entering trachea by elevation of larynx and closure of vocal
folds- glottis and epiglottis.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller uneebihsan28. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £9.66. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50843 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now