Lesson Notes By Weeks and Term - Senior Secondary 2

Circulatory systems II

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TERM – 1ST TERM

WEEK THEEE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: HEALTH EDUCATION

Topic: CIRCULATORY SYSTEMS II

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

I.) Define blood

II.) Identify the components of blood

III.) Discuss the functions of blood.

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 introduces the concept, blood and describe it's components.

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discuss the functions of blood.

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

CIRCULATORY SYSTEMS II

Blood is a specialized bodily fluid that circulates through the blood vessels and plays a vital role in transporting essential substances throughout the body. It consists of several components, including:

  1. Plasma: Plasma is the liquid portion of blood, making up about 55% of its volume. It is mostly composed of water (approximately 90%) and contains various proteins, electrolytes, hormones, nutrients, gases, and waste products.
  2. Blood Cells: Blood contains three main types of cells suspended in plasma: red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

   - Red Blood Cells (RBCs/Erythrocytes): Red blood cells are the most abundant type of blood cell. Their primary function is to transport oxygen from the lungs to tissues throughout the body and to transport carbon dioxide from tissues back to the lungs for exhalation.

   - White Blood Cells (WBCs/Leukocytes): White blood cells are part of the body's immune system and play a crucial role in defending against infections and diseases.

   - Platelets (Thrombocytes): Platelets are small, irregularly shaped cell fragments involved in blood clotting (coagulation).

Functions of the blood

The blood performs several crucial functions in the body, essential for maintaining overall health and homeostasis:

  1. Blood carries oxygen from the lungs to tissues and organs throughout the body, where it is needed for cellular respiration and energy production.
  2. It also transports nutrients, such as glucose, amino acids, and fatty acids, absorbed from the digestive system to cells for metabolism.
  3. Blood contains white blood cells (leukocytes) and antibodies that help defend the body against infections and diseases.
  4. Platelets in the blood are essential for forming blood clots (coagulation) to prevent excessive bleeding when blood vessels are injured.
  5. Blood helps regulate various physiological processes in the body, including pH balance, temperature, and fluid balance.
  6. Blood facilitates the exchange of oxygen and carbon dioxide between the lungs and tissues through the process of respiration.

EVALUATION: 1. Identify all the components of blood and state their roles.

  1. Mention 5 functions of the blood in the body.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively