Answer: Trevor Hancock's Mandala of Health is a holistic, ecological model illustrating health as determined by multiple, interconnected layers, extending beyond just medical care. At its core lies the individual, surrounded by their personal behaviour and lifestyle choices. Moving outwards, the model incorporates the family and community networks, highlighting the importance of social support and relationships. The outermost layers represent the broader social, cultural, economic, and physical environ...

Answer: Disease causation is multifactorial, arising from complex interactions among agent, host, and environment. Agents include biological pathogens (e.g., bacteria), chemical pollutants, and physical factors. Host characteristics like genetics, immunity, age, and lifestyle influence susceptibility. Environmental determinants, such as air/water quality, sanitation, socioeconomic status, and access to resources, significantly impact disease prevalence and spread, highlighting the health-environment in...

Answer: Different treatment technologies significantly impact human health. Water treatment methods, such as chlorination and filtration, primarily prevent waterborne diseases like cholera and typhoid by effectively removing pathogens and chemical contaminants from drinking water. Similarly, wastewater treatment reduces the spread of diseases and environmental pollution by treating sewage, thereby safeguarding public health. Conversely, improper solid waste disposal technologies have adverse effects. L...

Answer: Mercury exposure primarily causes severe neurological damage, leading to symptoms like tremors, memory impairment, and cognitive deficits. Fetal and childhood exposure is particularly concerning, potentially causing developmental disorders such as Minamata disease. It also impacts kidney function and the immune system. Factors associated with mercury's health effects include the type of mercury (methylmercury is highly toxic), the dose, duration, and route of exposure (e.g., through contaminate...

Answer: Environmental factors significantly contribute to disease causation and prevalence. These include physical elements like air and water pollution, extreme temperatures, and noise, which directly impact health (e.g., respiratory issues). Chemical contaminants, such as pesticides or heavy metals, can lead to chronic diseases or toxic effects. Biological agents like bacteria, viruses, and parasites transmitted through contaminated water or vectors are major causes of infectious diseases. Socio-econ...

Answer: Gluteraldehyde exposure can cause significant health effects, primarily respiratory irritation, leading to asthma-like symptoms and discomfort. It is also a potent skin sensitizer, frequently causing contact dermatitis, and irritates eyes and mucous membranes, potentially resulting in headaches. Key precautions include ensuring excellent local exhaust ventilation to minimise airborne concentrations. Workers must wear appropriate Personal Protective Equipment (PPE) such as impermeable gloves, ey...