Lesson Notes By Weeks and Term v4 - SHS 1
THE HUMAN BODY AND HEALTH
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
THE HUMAN BODY AND HEALTH
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: General Science
Class: SHS 1
Term: 2nd Term
Week: 1
Grade code: 2.4.1.LI.2
Strand code: 4
Sub-strand code: 1
Content standard code: 2.4.1.CS.1
Indicator code: 2.4.1.LI.2
Theme: RELATIONSHIP WITH THE ENVIRONMENT
Subtheme: THE HUMAN BODY AND HEALTH
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
This lesson introduces learners to pathogenic diseases, focusing on those prevalent in our Ghanaian communities. We are all affected by sickness, either personally or through family and friends. Understanding why we get sick and how to prevent it is a crucial life skill. This lesson moves beyond just naming diseases; it empowers us to identify their true causes, recognise symptoms, and take practical steps for prevention. We will also confront and correct common myths and stereotypes that can cause fear and discrimination, promoting a more tolerant and informed community.
(Teacher's Content Notes) Part 1: Foundational Concepts (15 mins) What is a Disease? A disease is any condition that impairs the normal functioning of the body. It is a disorder of structure or function. What is a Pathogen? A pathogen is a micro-organism that can cause disease. The name comes from Greek words: *pathos* (suffering, disease) and *genes* (producer of). So, a pathogen is a "disease producer". Types of Pathogens: Viruses (e.g., HIV, Influenza virus) Bacteria (e.g., *Vibrio cholerae*, *Mycobacterium tuberculosis*) Fungi (e.g., *Candida albicans* which causes candidiasis) Protozoa (e.g., *Plasmodium* which causes malaria) What is a Vector? A vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another. Example: The female Anopheles mosquito is a *vector*. It carries the *pathogen* (Plasmodium) from an infected person to a healthy person. The mosquito itself does not cause malaria; the Plasmodium inside it does. Communicable vs. Non-communicable Diseases: Communicable (Infectious) Diseases: These can be spread from one person to another or from an animal to a person. They are caused by pathogens. Our focus today is on these diseases. (e.g., Malaria, COVID-19, Cholera). Non-communicable Diseases: These cannot be spread from person to person. They are often caused by genetics, lifestyle, or environmental factors. (e.g., Diabetes, Hypertension, Sickle-cell Anaemia). Part 2: Examining Specific Pathogenic Diseases in Ghana (30 mins)
Let's examine three diseases that are very common in our communities. A. MALARIA Causative Agent (Pathogen): A protozoan called Plasmodium. There are several species, but *Plasmodium falciparum* is the most common and dangerous in Ghana. Mode of Transmission: Transmitted through the bite of an infected female Anopheles mosquito (the vector). The mosquito picks up the Plasmodium when it bites an infected person and injects it into a new person during its next blood meal. *Why only the female?* The female mosquito needs blood to produce eggs. The male mosquito feeds on plant nectar. Common Symptoms: High fever (feeling very hot) Severe chills and shivering Headache Vomiting and nausea Muscle and joint pain Profuse sweating when the fever breaks In severe cases (especially in children): convulsions, anaemia, coma. Prevention and Control: The key is to break the transmission cycle. Preventing Mosquito Bites: Sleep under an Insecticide-Treated Net (ITN). Wear long-sleeved clothing in the evenings. Use mosquito repellent. Controlling the Vector: Destroy mosquito breeding grounds. This means clearing bushes around the house, covering water storage containers, and draining stagnant water from old tyres, gutters, and puddles. Medical Prevention: For pregnant women and children in high-risk areas, there is Intermittent Preventive Treatment (IPT). Also, prompt diagnosis and treatment of infected persons prevent them from being a source of infection for mosquitoes. Myths and Misconceptions: Myth: "Malaria is caused by getting drenched in the rain or by eating too much palm oil." Scientific Truth: Malaria is only caused by the Plasmodium parasite transmitted by a mosquito bite. While being in the rain might lower your immunity temporarily, it does not create the parasite. Diet has no direct link to causing malaria. Harm: These beliefs can make people neglect the real preventative measures, like using bed nets and managing their environment. B. CHOLERA Causative Agent (Pathogen): A bacterium called *Vibrio cholerae*. Mode of Transmission: Faecal-oral route. This means the bacteria are passed in the faeces of an infected person and then enter another person’s mouth. This happens through: Drinking contaminated water. Eating contaminated food (e.g., food washed with dirty water, or food handled by an infected person with unwashed hands). Poor sanitation and hygiene. Common Symptoms: The main issue is rapid fluid loss. Severe, painless, watery diarrhoea, often described as "rice-water stool". Vomiting. Rapid dehydration (sunken eyes, dry mouth, extreme thirst, little or no urine). Muscle cramps due to loss of salts. If untreated, can lead to shock and death within hours. Prevention and Control: Focus on WASH (Water, Sanitation, and Hygiene). Safe Water: Drink water from a safe source. If unsure, boil it or treat it with chlorine. Proper Sanitation: Use a proper toilet (latrine/WC) and ensure faeces are disposed of safely. Avoid open defecation. Good Hygiene: Wash hands with soap and water thoroughly after using the toilet and before preparing or eating food. Wash fruits and vegetables with safe water. Cook food thoroughly. Myths and Misconceptions: Myth: "Cholera is a spiritual curse on a community for wrongdoing." Scientific Truth: Cholera is a bacterial infection directly linked to contaminated water and food. Its outbreak is a sign of a breakdown in public health infrastructure (sanitation, clean water), not a supernatural event. Harm: Blaming a curse prevents communities from taking the practical, scientific steps needed to stop the outbreak, such as improving hygiene and water sources. C. TUBERCULOSIS (TB) Causative Agent (Pathogen): A bacterium called *Mycobacterium tuberculosis*. Mode of Transmission: It is an airborne disease. When a person with active TB disease of the lungs coughs, sneezes, or even speaks, they release tiny droplets containing the bacteria into the air. A healthy person can then breathe in these droplets and become infected. Common Symptoms: A persistent cough that lasts for more than two weeks (sometimes with blood). Fever. Unexplained weight loss. Night sweats (drenching sweats during sleep). Chest pain. Fatigue or weakness. Prevention and Control: Vaccination: The BCG (Bacille Calmette-Guérin) vaccine, given to babies in Ghana at birth, helps protect against severe forms of TB in children. Good Ventilation: Ensure homes, classrooms, and offices are well-ventilated with fresh air to disperse any airborne droplets. Avoid overcrowding. Case Finding and Treatment: Identify people with active TB and put them on treatment. The treatment is long (usually 6 months), but it is crucial that they complete it. A treated person quickly becomes non-infectious. Covering Mouth/Nose: Coughing or sneezing into a tissue or the elbow can help reduce the spread of droplets. Myths and Stereotypes: Stereotype: "TB is a 'poor man's disease' or a disease for people who live dirty lives." or "It is a result of a curse or witchcraft." Scientific Truth: Anyone can get TB. The bacteria spreads through the air we all breathe. While it is true that conditions like overcrowding and poor nutrition (often linked to poverty) can make people more vulnerable, the disease itself does not discriminate. It is not caused by a curse. Harm: This stereotype leads to stigma and discrimination. People with a cough may be afraid to go to the clinic for fear of being ostracised. This delay in diagnosis means they can spread the disease to many others and their own condition gets worse. We must show tolerance and encourage people to seek help.
Guided Practice (With Solutions)
(Activity to be done with the whole class or in small groups, led by the teacher)