CBSE Class 11 Biology - Structure of the small intestine

In this article, we are discussing ‘the structure of the small intestine’ from Class 11 Biology in order to understand the function of the small intestine in digestion and mainly absorption.

STRUCTURE OF SMALL INTESTINE : The majority of digestion and absorption of nutrients takes place in the small intestine.

Absorption is the passage of digested food material through the lining of the intestine into the blood or lymph. Lymph is a colorless fluid containing white blood cells (WBC) that circulate through our body tissues. The WBC present in lymph helps to fight any infection that enters our body.

The small intestine has four tissue layers:

The serosa is the outermost layer of the intestine. The serosa is a smooth membrane consisting of a thin layer of cells that secrete serous fluid and a thin layer of connective tissue. Serous fluid is a lubricating fluid that reduces friction from the movement of the muscularis.
The muscularis is a region of muscle adjacent to the submucosa membrane. It is responsible for gut movement, or peristalsis. It usually has two distinct layers of smooth muscle: circular and longitudinal.
The submucosa is the layer of dense, irregular connective tissue or loose connective tissue that supports the mucosa, as well as joins the mucosa to the bulk of underlying smooth muscle.

Brunner’s Gland

Brunner’s glands (or duodenal glands) are compound tubular submucosal glands found in the duodenum. The main function of these glands is to produce a mucus-rich, alkaline secretion (containing bicarbonate) in order to neutralize the acidic content of chyme. The chyme is introduced into the duodenum from the stomach. These glands provide an alkaline condition for optimal intestinal enzyme activity, thus enabling absorption to take place and lubricate the intestinal walls.

For 11th science, Biology notes, online classes for Class 11, study material, sample papers, NCERT solutions for Class 11th and 12th, register with Takshila Learning.

Call us : 8800999280/8800999284

Comments

Online cbse coaching class for 11 Mathematics

Online cbse Class 11 maths : Online coaching classes for 11 maths and for other subjects. We are here to solve students problem instantly, So that they can improve himself/herself. One to One Correspondence and Equivalent Sets Suppose the members of the family are dinning and plates are prepared on the table then there is a One to one correspondence between the set of family members and the plates prepared. We will indicate this correspondence by the symbol If each element of a set A is associated with one and only one element of a set B and each element of B is associated with one and only one element of set A, then the sets A and B are said to be in one to one correspondence. If both the sets are finite and if they are in one to one correspondence, it is obvious that they have the same number of elements. If two sets have the same number of elements, they are said to be equivalent sets. Using symbol, we write A B. Between two equivalent sets, a one to one corr...

Best Sample papers for Bank PO Exam Download

Sample papers for Bank PO Exam | Question Paper for Bank PO : Institute of banking Personnel Selection (IBPS) Department issued a Notification of IBPS PO 2017 exam announced in October month. IBPS Probationary Officer (PO) Online Application Form process will be begin from July 2017. This is a hard exam for all students so aware of its value. Large number of candidates will participate in this exam. So all candidates should prepare well for it. Check out IBPS, Bank PO Sample papers, Question Paper Pattern, SBI PO Syllabus , IBPS Syllabus and other IBPS PO Preparation 2017 This paper is identical to any Bank PO Question Paper Pattern. Check whole IBPS Bank “PO question paper” subject wise. IBPS (PO) Paper Pattern Analysis with Syllabus and main topics of IBPS Exam 2017. PO Question Paper Pattern, Bank PO sample Papers for IBPS Bank Exam IBPS PO Exam will be conducted at three levels 1st- PO Preliminary Exam 2nd- PO Mains Exam 3rd- PO Common ...

What is the difference between human and physical capital

Difference between human and physical capital Human capital refers to a worker's abilities, education, ability, and other attributes that influence his or her productive capacity and earning potential. Physical capital Presence of trade barriers lead to mobility restriction. Process of formation is economic and technical. Physical capital is separable from the owner. Possibility of trading physical capital in the market exists. Continuous use leads to depreciation. Financial statements are present. Human capital Culture and nationality lead to mobility restriction. Process of formation is conscious and social process. Human capital is not separable Services rendered by the human capital can only be sold. Ageing leads to the depreciation but it can be minimized up to some extent. Financial statements are absent. Click to know for Importance and Impact of human capital on economic growth Tag - class 9 social science , class 9 economics, Human capital meaning, school online classes

Takshila Learning - Online Tutorials

Search This Blog