Lesson Notes By Weeks and Term v4 - JHS 2
THE HUMAN BODY SYSTEM
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THE HUMAN BODY SYSTEM
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Subject: Science
Class: JHS 2
Term: 1st Term
Week: 14
Grade code: B8.3.1.1.1
Strand code: 3
Sub-strand code: 1
Content standard code: B8.3.1.1
Indicator code: B8.3.1.1.1
Theme: SYSTEMS
Subtheme: THE HUMAN BODY SYSTEM
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Teeth are part of the digestive system and help us to bite, chew, and speak clearly. In Ghana, good knowledge of tooth parts helps learners understand tooth decay, why some foods (e.g., toffees, sugary drinks) damage teeth, and why brushing properly matters. It also helps learners communicate well with health workers at the clinic or dental unit.
2.1 What is a mammalian tooth? A mammalian tooth is a hard structure found in the mouth of mammals (including humans). It is adapted for feeding and is made of hard outer layers and living inner tissues.
Humans are mammals, so a human tooth is a mammalian tooth.
2.2 Main external parts of a mammalian tooth (Indicator focus) A typical tooth has three main external parts: (A) Crown Definition: The part of the tooth above the gum (visible in the mouth). Function: Used for biting and chewing food. Covered by enamel, the hardest substance in the human body, to protect it from wear and acids.
Ghanaian example: When eating kenkey with fish, the crown helps you chew the fish and kenkey into smaller pieces for swallowing. (B) Neck Definition: The narrow region where the crown meets the root, usually at the gum line. Function: Acts as a junction/connection between crown and root. It is a sensitive area; if gums recede (pull back), the neck may be exposed and cause pain when drinking cold water.