Lesson Notes By Weeks and Term - Senior Secondary 1

Absorption of food nutrients

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  4. Absorption of food nutrients

Term: 1st Term

Week: 12

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes

Date:       

Subject:      Food and nutrition

Topic:-       Absorption of food nutrients

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Define absorption
  2. Discuss the process of absorption

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S ACTIVITY

STEP 1

INTRODUCTION

The teacher reviews the previous lesson on the digestive system

Students pay attention

STEP 2

EXPLANATION

She defines absorption

Students pay attention and participates

STEP 3

DEMONSTRATION

She discusses the process of absorption

Students pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a summarized note on the board

The students copy the note in their books

 

NOTE

ABSORPTION OF FOOD NUTRIENTS

The process by which the end products of digestion passes through the lining of the digestive tract is called absorption.

Absorption takes place through the inner lining of the small intestine called villi. the simple sugar and amino acids enter into the blood directly while the fatty acids enter the blood system indirectly through the lymphatic system.

Site

Digestive juice

Optimum pH

Enzyme

Functions (reactions)

Mouth

Saliva

Alkaline

Ptyalin

Starch ==> maltose

Stomach

Gastric juice

Acidic (due to the presence of hydrochloric acid)

Pepsin    Renin

Converts protein to peptide and peptone. Acts on milk proteins only and curdles it by converting the caseinogen (soluble) to casein (insoluble)

Duodenum

Bile secreted by the gall bladder Pancreatic juice produced by the pancreas

Alkaline   Alkaline    

Contains no enzyme but bile salts amylase Trypsin lipase

The bile salts emulsify the fats.   Starch  ==>  maltose   
Protein ==> peptides/peptones                  
Fats  ==> fatty acids and glycerol               

Small intestine or ileum

Intestinal juice

Alkaline

Maltase Lactase Sucrose Peptidase Lipase

      

 

EVALUATION:    1. Define absorption

  1. Discuss the process of absorption

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively