Exam (elaborations)
CHAPTER-16 DIGESTION AND ABSORPTION
- Course
- Institution
CHAPTER-16 DIGESTION AND ABSORPTION
[Show more]
Content preview
CBSE Quick Revision Notes (Class-11 Biology)CHAPTER-16 DIGESTION AND ABSORPTION
The process of conversion of complex food into simpler absorbable form is called digestion
and is carried out by digestive system by mechanical and biochemical methods.
Digestive System- Human digestive system consists of alimentary canal and associated
glands.
• Alimentary canal begin with anterior opening
mouth and opens out posteriorly through anus.
It comprises of following parts:-
a. Mouth- leads to oral cavity or buccal cavity
which contains teeth and tongue. Each teeth is
embedded in socket of jaw bone ( thecodont).
Milk teeth is replaced by permanent or adult
teeth, this type of dentation is called
diphyodont. Four different types of teeth are
incisors (I), canine (C), premolar (PM) and
molar (M).
Dental formula -
Upper surface of tongue has small projections called papillae, some of which contain taste
buds.
b. Pharynx – oral cavity opens into pharynx which acts as common passage for food and air.
Cartilaginous flaps called epiglottis prevents the entry of food into wind pipe (glottis)
during swallowing.
c. Stomach- Oesophagus leads to stomach. The opening of
stomach is guarded by a sphincter (gastro-esophageal).
Stomach is divided into three parts- cardiac, fundic and
pyloric.
d. Small intestine- is the longest part of alimentary canal
divided into duodenum, jejunum and ileum. Pyloric
sphincter is present between stomach and duodenum.
e. Large intestine- ileum opens into large intestine, which is divided into caecum, colon and
rectum. Caecum is a blind sac which host microbes. Vermiform appendix arises from
caecum. Rectum opens through anus.
Histology of Alimentary canal-
The wall of alimentary canal from
Oesophagus to rectum consists of four
layers.
a) Serosa- it is the outermost layer made
up of squamous epithelium and areolar
connective tissue.
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
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 or Stuvia-credit 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 lennyjast. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80364 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now