Lesson Notes By Weeks and Term - Senior Secondary 1

WEEK EIGHT

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: PHYSICAL EDUCATION

Topic: THE CIRCULATORY SYSTEM

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

1. Describe the circulatory system
2. Identify the roles of the circulatory system
3. Discuss the circulatory system of mammals

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

THE CIRCULATORY SYSTEM

The circulatory system, also known as the cardiovascular system, is a complex network of blood vessels, including arteries, veins, and capillaries, that transport essential substances throughout the body. This system functions in close association with the heart, which serves as the central pump, and the lungs, which facilitate gas exchange.

Roles of the circulatory system

The primary roles of the circulatory system include:

1. The circulatory system delivers oxygenated blood from the lungs to the body's cells and transports nutrients derived from the digestive system. I
2. The circulatory system collects waste products, such as metabolic wastes and carbon dioxide, from cells and transports them to organs like the liver, kidneys, and lungs for elimination.
3. The circulatory system helps maintain a stable body temperature by distributing heat throughout the body and transporting heat to the skin's surface for dissipation.
4. The circulatory system carries white blood cells, antibodies, and other immune system components to sites of infection or injury, enabling rapid immune responses to protect the body against pathogens and foreign substances.
5. The circulatory system is involved in the clotting process to prevent excessive blood loss due to injury.

The Circulatory System Of Mammals

The mammalian circulatory system consists of several essential organs that work together to ensure proper blood circulation and transport of vital substances throughout the body. The essential organs involve includes;

1. Heart: The heart is a muscular organ responsible for pumping blood throughout the circulatory system. It has four chambers: two atria and two ventricles. Oxygen-poor blood enters the right atrium, while oxygen-rich blood enters the left atrium. The ventricles then pump blood to the lungs (via the pulmonary artery) and the rest of the body (via the aorta).
2. Blood vessels: There are three main types of blood vessels in the circulatory system:

  - Arteries: These are the blood vessels that carry oxygenated blood away from the heart to the body's tissues and organs. Arteries have thick, muscular walls to withstand the high pressure of blood flow.

  - Veins: Veins carry deoxygenated blood from the body's tissues back to the heart. They have thinner walls and valves to prevent blood backflow.

  - Capillaries: Capillaries are tiny, thin-walled vessels that connect arteries to veins. They allow for the exchange of oxygen, nutrients, waste products, and carbon dioxide between the blood and the surrounding tissues.

EVALUATION: 1. Mention 4 roles of the circulatory system

2. Discuss briefly the circulatory system of mammals.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively