TEACHING MANUALName of the teacher :- Parvathi T Pillai

Name of the school :- St.Thomas English Medium school std:- IX

Name of the subject :- Biology str :- 45

Name of the Unit :- Circulatory Pathways duration :- 45mnts

CURRICULAR STATEMENT

Develops different dimensions of knowledge, process skills abd attitude on ‘struture of villus, & its function in circulatory pathway’ through lecture method, demonstration, group discussion and evaluation by questioning.

CONTENT ANALYSIS

NEW TERMS

FACTS

Digestion, digestive system, small intestine, abdominal cavity, Villi, capillaries, lacteals, lymph vessel, artery, vein.

1) Digestion of food is completed in the small intestine.2) The components like water, oxygen, nutrients, excretory

matter etc. are carried to various parts of athe body.3) The small intestine is seen as many folds, twisted, and

coiled.4) There are a number of blood vessels in the small intestine.5) The inner surface of small intestine is modified into many

infoldings, finger shaped villi are seen.6) The infoldings of small intestine & villi increases the

surface area for absorption. 7) The nutrients are absorbed through this villi.8) The group of small blood vessels that connect the veins

with the arteries are called network of capillaries. 9) A small branch of lymph vessels is also seen in the villus

called lacteal.

Minor concept

Major concept

Learning outcome

Pre-requisites

Learning aids

10) Glucose and aminoacid are absorbed into the blood and fatty acid & glycerol into the lymph.

Digestion Structure of intestine Structure of villi Absorption

Special structures called ‘villus’ seen in small intestine helps in absorption & transport of energy to different parts of the body through blood.

The pupil,a) recalls the process of digestionb) acquires knowledge about the location of villi, in

small intestinec) understands the structure & function of villi, in small

intestined) analyses which food particles is carried by lymph

and bloode) develops scientific process skills like observationf) develops components of creativity like visualizationg) evaluates the importance of villus in small intestine

to increase the surface area for proper absorption Digestion is completed in small intestine & absorption takes place

Chart showing diagramatic representation of digestive system & structure of villus

Video showing process of digestion in stomach model

CLASS ROOM INTERACTION PROCEDURE EXPECTED RESPONSE

INTRODUCTION Teacher make rapport with the students by asking questions related contextual situation.Teacher ask following question,o Have you had your breakfast?o Why we eat food?o How we get energy directly from food?o Where absorption takes place?o Who carry food to various parts of our

body?o How do particles reach each cell?

ACTIVITY-1 [Creating problematic situation]Teacher shows the chart of digestive system and ask students to locate small intestine.

Pupil interacts with the teacher

Pupil give their answers Yes To get energy Through absorption Intestine Blood

Tissue fluid

Students observe the chart and locate the small intestine.

DISCUSSION POINTS The small intestine is seen as many folds, twisted & coiled within the abdominal cavity. Food particles move slowly through the small intestine.

ACTIVITY -2 [Presentation] Teacher divides the students inti groups & shows the model of a small intestine & ask students to observe & analyze it & discuss it in your groups.

ACTIVITY-3Teacher shows the chart chart of the structure of villus and ask students to locate & read the labeled parts.

Students observe the model and discuss in groups.

Students observe the chart & locate &labeled parts of villus.

DISCUSSION POINTS The inner surface of the small intestine is modified into many folding. Within the infoldings finger shaped villi are seen. The nutrients are absorbed through these villi. Infoldings and villi increase surface area for absorption.

ACTIVITY-4Teacher give 3 activity card to the students &ask them to discuss in groups and give answers.

i. What is network of capillaries?ii. What is lacteal?

iii. Which fluid absorb glucose and fatty acid?

DISCUSSION POINTSThe group of small blood vessels that connects the vein with the areries are called network of capillaries. A small branch of the lymph vessel is also seen in the villus. This is called lacteal. Glucose & aminoacid are absorbed into blood & fatty acid & glycerol into the lymph.

Students discuss in groups and give their answers.

DISCUSSION POITS The arteriols that spread throughout the walls of the small intestine enter villi & further divide into smaller branches. They join together again to form small veins.

CHALK BOARD SUMMARY

Digestion- small intestineFinger like projections – villiVilli- absorb nutrientsBlood – absorb glucose & aminoacidLymph – absorb fatty acid & glycerol

REVIEW QUESTIONS

1) Where absorption of food takes place?2) What is villi?3) What is the role of villi in digestion?

FOLLOW UP ACTIVITY

Draw the structure of villus, label its parts & write the function.