Lesson Notes By Weeks and Term v4 - SHS 3
MAMMALIAN SYSTEMS
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MAMMALIAN SYSTEMS
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Subject: Biology
Class: SHS 3
Term: 2nd Term
Week: 15
Grade code: 3.4.1.LI.3
Strand code: 4
Sub-strand code: 1
Content standard code: 3.4.1.CS.1
Indicator code: 3.4.1.LI.3
Theme: SYSTEMS OF LIFE
Subtheme: MAMMALIAN SYSTEMS
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The musculoskeletal system is the incredible framework of bones and muscles that gives our bodies shape, allows us to move, and protects our vital organs. For a Ghanaian learner, understanding this system is crucial. It explains how we can walk to school, play football with friends, help carry items from the market, or even just sit upright in the classroom. This lesson will explore the structure of our bones, how muscles work in teams to create movement, and how this system partners with others like the nervous and circulatory systems to keep us active and healthy. We will also connect this knowledge to our diet, posture, and preventing common injuries.
Part A: Introduction to the Musculoskeletal System
The musculoskeletal system is a composite system comprising the skeletal system and the muscular system. Skeletal System: This is the hard, passive framework. It includes bones, cartilage, and ligaments. Bones: Hard, rigid connective tissue that forms the main structure. Cartilage: Firm, flexible connective tissue found at the ends of bones, in the nose, and ears. It reduces friction at joints. Ligaments: Tough, fibrous bands of tissue that connect bone to bone, holding joints together. Muscular System: This is the active component that produces movement. It includes skeletal muscles and tendons. Muscles: Tissues that can contract (shorten) and relax (lengthen) to exert force. Tendons: Tough, fibrous cords of tissue that connect muscle to bone. A simple way to remember: Tendon connects Muscle to Bone (TMB). Part B: The Mammalian Skeleton (Human Example)
The human skeleton is an endoskeleton (internal skeleton) and has five primary functions: Support: Provides a rigid framework that supports the body and gives it shape. Without it, we would be a shapeless mass. Protection: Protects vital internal organs. For example, the skull protects the brain, and the rib cage protects the heart and lungs. Movement: Provides a system of levers on which muscles can act to produce movement. Mineral Storage: Bones act as a reservoir for minerals, especially calcium and phosphorus. Blood Cell Production (Haemopoiesis): Red blood cells, white blood cells, and platelets are produced in the red bone marrow, found in certain bones like the sternum and femur.
Major Parts of the Skeleton: The Skull: Composed of two main parts: the cranium and the facial bones. Cranium: A strong, bony box that encloses and protects the delicate brain. Facial Bones: Form the structure of the face and house the sense organs (eyes, nose). The lower jaw (mandible) is the only movable bone of the skull, allowing for chewing and speaking.