Lesson Notes By Weeks and Term v4 - SHS 1
ESSENTIALS FOR SURVIVAL
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ESSENTIALS FOR SURVIVAL
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Subject: General Science
Class: SHS 1
Term: 2nd Term
Week: 7
Grade code: 3.2.1.LI.2
Strand code: 2
Sub-strand code: 1
Content standard code: 3.2.1.CS.1
Indicator code: 3.2.1.LI.2
Theme: PROCESSES FOR LIVING
Subtheme: ESSENTIALS FOR SURVIVAL
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This lesson explores a vital part of our body's control system: the Peripheral Nervous System (PNS). Think about it: how do you feel the warmth of the sun on your skin, or the sharp taste of lime? How does your body know to sweat when you play football, or to make your heart race when you are scared? The answer lies in the vast network of nerves that connect your brain and spinal cord to every single part of your body. This network is the Peripheral Nervous System, and it is absolutely essential for our daily actions, reactions, and survival. Understanding how it works helps us appreciate the complexity of our bodies and the importance of keeping them healthy.
A. The Overall Structure of the Nervous System
Before we dive into the Peripheral Nervous System, let's remember the big picture. The human nervous system is divided into two main parts: The Central Nervous System (CNS): This is the main control centre. It consists of the brain and the spinal cord. Think of it as the President and the Cabinet at Jubilee House – it's where major decisions are made. The Peripheral Nervous System (PNS): This is our focus today. It consists of all the nerves that branch out from the brain and spinal cord to all other parts of the body – the limbs, muscles, skin, and internal organs.
Analogy: Imagine the CNS (brain and spinal cord) is the head office of ECG (Electricity Company of Ghana) in Accra. The PNS is the vast network of electrical cables and poles that carry electricity from the head office to every single house, school, and factory in Ghana, and also send back information about power usage. The PNS is the communication network. B. The Peripheral Nervous System (PNS) in Detail
The PNS has two major divisions based on the functions they control: The Somatic Nervous System (SNS) The Autonomic Nervous System (ANS)