CELL BIOLOGY
1. Researchers in Mbale District compared lung tissue samples from long-term
smokers and non-smokers to understand why smokers often experience shortness
of breath, fatigue, and persistent coughing. Some samples were obtained from
individuals who had been working in poorly ventilated areas and had diets low in
antioxidants.
Observation Non-smoker Smoker
Elastic fiber content (%) 95 40
Collagenase enzyme activity (%) 100 180
Alveolar wall thickness (µm) 2 5
Number of alveoli per mm² 120 70
Vital capacity (L) 4.8 2.9
Reference: Respiratory Tissue Research Journal, 2023 “Connective Tissue
Remodeling in Chronic Smokers”
Task:
a) Explain how enzyme activity and connective tissue changes contribute to
reduced lung efficiency.
b) Suggest physiologically supported strategies to prevent or reverse such
damage.
2. Medical students at Mulago Hospital examined epithelial samples from residents
living near Kampala’s Northern Bypass, where traffic pollution is heavy.
Residents reported frequent coughing and throat irritation. The polluted zone had
visibly darker dust deposits and frequent temperature inversions at night, reducing
air movement.
Parameter Control (Suburban Area) Polluted Zone
Ciliated epithelial cell density 320 110
(cells/mm²)
Mucus viscosity (Pa·s) 0.8 2.3
Lysozyme enzyme activity (%) 100 40
Alveolar macrophage count 1200 600
Bacterial colonies per sample 5 25
Reference: Urban Health and Air Quality Studies (2024) “Cilia Damage and
Lysozyme Inhibition by Pollutants”
Task:
a) Explain how structural and enzymatic changes in the respiratory epithelium
impair its function.
b) Propose and justify community and biological strategies to reduce damage and
restore respiratory health.
3. Two muscle samples were examined following exercise-related injuries. One
belonged to a patient consuming high protein and vitamin-rich meals, while the
1
, other came from a patient with low dietary protein intake and chronic
inflammation.
Sample Myofibril Nuclei/fiber Collagen CK Enzyme
alignment deposition Activity (U/L)
Normal Regular 5 Low 120
Injured Disorganized 10 High 400
Reference: Human Physiology Review (2022), “Regenerative Mechanisms in
Skeletal Muscle Injury”
Task:
a) Analyse how these changes show structure function relationships and muscle
repair mechanisms.
b) Suggest strategies to promote healthy muscle regeneration and prevent
fibrosis using the clues provided.
4. A clinic investigated how smoking and chemical exposure affect respiratory
health. Samples from a smoker and a healthy non-smoker were analysed. The
smoker also reported frequent dehydration and poor dietary habits.
Tissue Cilia Density Goblet Cells Mucus Oxygen Uptake
Type (per mm²) (per mm²) Thickness Rate (mL/min)
(µm)
Healthy 280 80 5 200
Smoker 100 200 15 90
Reference: African Journal of Pulmonary Research (2023), “Histological Impacts of
Smoking on Lung Tissues”
Task:
a) Explain how structural changes in epithelial tissue impair its function.
b) Suggest five public-health or lifestyle strategies to reduce tissue damage and
promote recovery.
5. A medical investigation explored why diabetic patients experience delayed wound
healing after skin burns. Samples were collected from two patients—one with
controlled glucose levels and another with poorly managed diabetes. The diabetic
patient also had reduced physical activity and poor hydration habits.
Observation Normal Skin Diabetic Burn Skin
Epidermal cell division rate (cells/day) 240 80
Collagenase activity (%) 100 40
Fibroblast density (per mm²) 1200 700
Capillary density Normal Sparse
Blood glucose (mmol/L) 4.8 10.5
Reference: Medical Biochemistry Today (2024) “Enzyme Dysfunction and Delayed
Healing in Diabetes”
Task:
a) Analyse how enzyme activity and tissue organisation influence wound repair.
2
, b) Suggest measures to improve recovery in diabetic patients.
6. A team of students at Gulu University investigated why some individuals
experience bloating and fatigue after heavy meals. They compared intestinal
enzyme activity and tissue features in two groups: one consuming a balanced diet
rich in fruits and fiber, and another eating mostly fatty, processed foods.
Parameter Balanced Diet Group High-Fat Diet Group
Lipase activity (%) 100 50
Villi height (µm) 500 250
Goblet cell count (per mm²) 60 120
Absorption rate (mg/min) 150 70
Intestinal mucus thickness (µm) 5 15
Reference: Nutrition and Cell Function Research (2023), “Dietary Fat and Enzyme
Activity in Human Intestines”
Task:
a) Explain how differences in enzyme activity and tissue structure affect
digestion and absorption.
b) Suggest dietary and physiological strategies to maintain healthy intestinal
function.
7. In a rural health study, medical interns investigated why some farmers exposed to
pesticide residues developed fatigue and yellowish eyes. Liver tissue samples were
analysed for enzyme activity and structure. Many farmers lacked protective gear
and drank untreated water from nearby irrigation canals.
Parameter Control (Unexposed) Exposed Farmers
Catalase activity (%) 100 45
ALT enzyme level (U/L) 30 95
Liver cell density (cells/mm²) 500 280
Mitochondrial density Normal Reduced
Blood bilirubin (mg/dL) 0.8 2.5
Reference: Environmental Health and Biochemistry Journal (2024) “Pesticide-
Induced Enzyme Inhibition in Human Liver Tissues”
Task:
a) Explain how pesticide exposure affects enzyme function and tissue structure in
the liver.
b) Propose biologically sound strategies to prevent or reverse such damage in
farming communties.
TRANSPORT
8. Three Ugandan athletes trained under different environmental conditions and
participated in a national cross-country competition. Doctors assessed their blood
and immune indicators before and after the race. One athlete trained at high altitude,
another at sea level, and a third in a humid, polluted city.
3
, Parameter High Altitude Sea Level Polluted
(Kapchorwa, 2200 m) (Entebbe, 1135 Lowland
m) (Jinja)
Haemoglobin 17.8 15.0 14.2
(g/dL)
Blood oxygen 93 98 90
saturation (%)
White blood cell 7,000 6,200 5,000
count (cells/µL)
Pulse rate after 120 145 160
race (beats/min)
Recovery time 3 7 10
(min)
Reference: African Journal of Exercise Immunology (2024). “Altitude Adaptations
and Immune Resilience in Athletes.”
Task:
a) Explain how differences in oxygen transport and immune cell activity
influence performance and recovery.
b) Suggest physiological and immunological strategies to strengthen endurance,
immunity, and recovery in different training environments.
9. Residents living near charcoal-burning sites in Fort Portal often complain of
fatigue and recurrent chest infections. Health workers investigated possible links
between carbon monoxide (CO) exposure, blood oxygen transport, and immune
performance.
Parameter Control Group Exposed Residents
Oxyhaemoglobin (%) 96 78
Carboxyhaemoglobin (%) 0.5 15
White blood cell count (cells/µL) 6,800 4,500
Respiration rate (breaths/min) 16 24
CO concentration (ppm) 0 120
Reference: Environmental and Human Health Research (2023). “Carbon Monoxide
Interference in Oxygen Transport and Immune Suppression.”
Task:
a) Analyse how carbon monoxide affects oxygen transport and weakens immune
protection.
b) Suggest biological and public-health strategies to prevent and manage such
exposure while maintaining respiratory and immune health.
10. At Mbarara Regional Hospital, a 25-year-old Rhesus-negative woman (Gravida 2)
presented with jaundice and fatigue. She received no Rh prophylaxis after her first
delivery. Ultrasound shows her baby has liver enlargement and anaemia.
4
1. Researchers in Mbale District compared lung tissue samples from long-term
smokers and non-smokers to understand why smokers often experience shortness
of breath, fatigue, and persistent coughing. Some samples were obtained from
individuals who had been working in poorly ventilated areas and had diets low in
antioxidants.
Observation Non-smoker Smoker
Elastic fiber content (%) 95 40
Collagenase enzyme activity (%) 100 180
Alveolar wall thickness (µm) 2 5
Number of alveoli per mm² 120 70
Vital capacity (L) 4.8 2.9
Reference: Respiratory Tissue Research Journal, 2023 “Connective Tissue
Remodeling in Chronic Smokers”
Task:
a) Explain how enzyme activity and connective tissue changes contribute to
reduced lung efficiency.
b) Suggest physiologically supported strategies to prevent or reverse such
damage.
2. Medical students at Mulago Hospital examined epithelial samples from residents
living near Kampala’s Northern Bypass, where traffic pollution is heavy.
Residents reported frequent coughing and throat irritation. The polluted zone had
visibly darker dust deposits and frequent temperature inversions at night, reducing
air movement.
Parameter Control (Suburban Area) Polluted Zone
Ciliated epithelial cell density 320 110
(cells/mm²)
Mucus viscosity (Pa·s) 0.8 2.3
Lysozyme enzyme activity (%) 100 40
Alveolar macrophage count 1200 600
Bacterial colonies per sample 5 25
Reference: Urban Health and Air Quality Studies (2024) “Cilia Damage and
Lysozyme Inhibition by Pollutants”
Task:
a) Explain how structural and enzymatic changes in the respiratory epithelium
impair its function.
b) Propose and justify community and biological strategies to reduce damage and
restore respiratory health.
3. Two muscle samples were examined following exercise-related injuries. One
belonged to a patient consuming high protein and vitamin-rich meals, while the
1
, other came from a patient with low dietary protein intake and chronic
inflammation.
Sample Myofibril Nuclei/fiber Collagen CK Enzyme
alignment deposition Activity (U/L)
Normal Regular 5 Low 120
Injured Disorganized 10 High 400
Reference: Human Physiology Review (2022), “Regenerative Mechanisms in
Skeletal Muscle Injury”
Task:
a) Analyse how these changes show structure function relationships and muscle
repair mechanisms.
b) Suggest strategies to promote healthy muscle regeneration and prevent
fibrosis using the clues provided.
4. A clinic investigated how smoking and chemical exposure affect respiratory
health. Samples from a smoker and a healthy non-smoker were analysed. The
smoker also reported frequent dehydration and poor dietary habits.
Tissue Cilia Density Goblet Cells Mucus Oxygen Uptake
Type (per mm²) (per mm²) Thickness Rate (mL/min)
(µm)
Healthy 280 80 5 200
Smoker 100 200 15 90
Reference: African Journal of Pulmonary Research (2023), “Histological Impacts of
Smoking on Lung Tissues”
Task:
a) Explain how structural changes in epithelial tissue impair its function.
b) Suggest five public-health or lifestyle strategies to reduce tissue damage and
promote recovery.
5. A medical investigation explored why diabetic patients experience delayed wound
healing after skin burns. Samples were collected from two patients—one with
controlled glucose levels and another with poorly managed diabetes. The diabetic
patient also had reduced physical activity and poor hydration habits.
Observation Normal Skin Diabetic Burn Skin
Epidermal cell division rate (cells/day) 240 80
Collagenase activity (%) 100 40
Fibroblast density (per mm²) 1200 700
Capillary density Normal Sparse
Blood glucose (mmol/L) 4.8 10.5
Reference: Medical Biochemistry Today (2024) “Enzyme Dysfunction and Delayed
Healing in Diabetes”
Task:
a) Analyse how enzyme activity and tissue organisation influence wound repair.
2
, b) Suggest measures to improve recovery in diabetic patients.
6. A team of students at Gulu University investigated why some individuals
experience bloating and fatigue after heavy meals. They compared intestinal
enzyme activity and tissue features in two groups: one consuming a balanced diet
rich in fruits and fiber, and another eating mostly fatty, processed foods.
Parameter Balanced Diet Group High-Fat Diet Group
Lipase activity (%) 100 50
Villi height (µm) 500 250
Goblet cell count (per mm²) 60 120
Absorption rate (mg/min) 150 70
Intestinal mucus thickness (µm) 5 15
Reference: Nutrition and Cell Function Research (2023), “Dietary Fat and Enzyme
Activity in Human Intestines”
Task:
a) Explain how differences in enzyme activity and tissue structure affect
digestion and absorption.
b) Suggest dietary and physiological strategies to maintain healthy intestinal
function.
7. In a rural health study, medical interns investigated why some farmers exposed to
pesticide residues developed fatigue and yellowish eyes. Liver tissue samples were
analysed for enzyme activity and structure. Many farmers lacked protective gear
and drank untreated water from nearby irrigation canals.
Parameter Control (Unexposed) Exposed Farmers
Catalase activity (%) 100 45
ALT enzyme level (U/L) 30 95
Liver cell density (cells/mm²) 500 280
Mitochondrial density Normal Reduced
Blood bilirubin (mg/dL) 0.8 2.5
Reference: Environmental Health and Biochemistry Journal (2024) “Pesticide-
Induced Enzyme Inhibition in Human Liver Tissues”
Task:
a) Explain how pesticide exposure affects enzyme function and tissue structure in
the liver.
b) Propose biologically sound strategies to prevent or reverse such damage in
farming communties.
TRANSPORT
8. Three Ugandan athletes trained under different environmental conditions and
participated in a national cross-country competition. Doctors assessed their blood
and immune indicators before and after the race. One athlete trained at high altitude,
another at sea level, and a third in a humid, polluted city.
3
, Parameter High Altitude Sea Level Polluted
(Kapchorwa, 2200 m) (Entebbe, 1135 Lowland
m) (Jinja)
Haemoglobin 17.8 15.0 14.2
(g/dL)
Blood oxygen 93 98 90
saturation (%)
White blood cell 7,000 6,200 5,000
count (cells/µL)
Pulse rate after 120 145 160
race (beats/min)
Recovery time 3 7 10
(min)
Reference: African Journal of Exercise Immunology (2024). “Altitude Adaptations
and Immune Resilience in Athletes.”
Task:
a) Explain how differences in oxygen transport and immune cell activity
influence performance and recovery.
b) Suggest physiological and immunological strategies to strengthen endurance,
immunity, and recovery in different training environments.
9. Residents living near charcoal-burning sites in Fort Portal often complain of
fatigue and recurrent chest infections. Health workers investigated possible links
between carbon monoxide (CO) exposure, blood oxygen transport, and immune
performance.
Parameter Control Group Exposed Residents
Oxyhaemoglobin (%) 96 78
Carboxyhaemoglobin (%) 0.5 15
White blood cell count (cells/µL) 6,800 4,500
Respiration rate (breaths/min) 16 24
CO concentration (ppm) 0 120
Reference: Environmental and Human Health Research (2023). “Carbon Monoxide
Interference in Oxygen Transport and Immune Suppression.”
Task:
a) Analyse how carbon monoxide affects oxygen transport and weakens immune
protection.
b) Suggest biological and public-health strategies to prevent and manage such
exposure while maintaining respiratory and immune health.
10. At Mbarara Regional Hospital, a 25-year-old Rhesus-negative woman (Gravida 2)
presented with jaundice and fatigue. She received no Rh prophylaxis after her first
delivery. Ultrasound shows her baby has liver enlargement and anaemia.
4
