Lesson Notes By Weeks and Term - Senior Secondary 2

Excretory system

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TERM – 1ST TERM

WEEK FOUR

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: HEALTH EDUCATION

Topic: EXCRETORY SYSTEM

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

I.) Define the Excretion

II.) Identify components of the excretory system

III.) Discuss the importance of the excretory system.

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

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains excretion and how the excretory system works.

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discuss the importance of excretory system to the body

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

EXCRETORY SYSTEM

Excretion is the process by which waste products, toxins, and excess substances are removed from the body. It is an essential function for maintaining homeostasis and preventing the accumulation of harmful substances that could disrupt bodily functions.

The excretory system is a biological system responsible for removing waste products and excess substances from the body to maintain internal balance and homeostasis. It comprises several organs and structures that work together to eliminate waste and regulate the composition of body fluids.

Components of excretory system

The essential components of the excretory system include:

  1. Kidneys: The kidneys are the primary organs of the excretory system. They filter waste products, toxins, and excess substances from the blood to produce urine.
  2. Lungs: The lungs excrete carbon dioxide, a waste product of cellular metabolism, during respiration. Carbon dioxide is expelled from the body during exhalation.
  3. Skin: The skin excretes small amounts of waste products, such as water, salts, and urea, through sweat glands during perspiration.
  4. Liver: The liver filters toxins and waste products from the blood and excretes them into bile, which is then eliminated from the body through the digestive system.

Importance of excretion

Excretion is vital for maintaining overall health and well-being due to its several important functions:

  1. Excretion removes metabolic waste products, toxins, and excess substances from the body, preventing their accumulation, which could otherwise be harmful to cells and tissues.
  2. By regulating the balance of electrolytes, fluids, and other substances in the body, excretion helps maintain internal balance (homeostasis), which is essential for proper cellular function and overall health.
  3. The excretory system plays a role in regulating blood pressure by controlling the balance of fluids and electrolytes in the body.
  4. Excretion helps regulate the pH balance of body fluids by eliminating acids and bases produced during metabolic processes.
  5. Excretion removes excess substances, such as water, electrolytes, and nutrients, that are not needed by the body or are present in excess amounts. .
  6. The excretory system, particularly sweating through the skin, helps regulate body temperature by dissipating heat through evaporation.

EVALUATION: 1. Define Excretion.

  1. What is excretory system?
  2. Identify all the components of the excretory system and describe their roles.
  3. Mention 5 importance of the excretory system to the body.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively