HSC Biology · Year 12
HSC Biology Module 8: Non-infectious Disease and Disorders — Flashcards & Quiz
HSC Biology Module 8 covers non-infectious diseases and disorders — conditions not caused by pathogens. Revise homeostasis, feedback mechanisms, the endocrine and nervous systems, cardiovascular disease, cancer, diabetes, genetic disorders, and the technologies used to assist and treat these conditions. These 20 flashcards and 20 true/false questions align to NESA syllabus dot-points, covering everything from thermoregulation and glucose homeostasis to epidemiological studies, prevention strategies and emerging medical technologies.
Key Terms
- Non-infectious disease
- A disease that cannot be transmitted between individuals and is caused by genetic, lifestyle or environmental factors rather than pathogens. NESA HSC Biology Module 8 requires students to classify non-infectious diseases by cause and compare prevention strategies for each category.
- Tumour suppressor gene
- A gene that normally regulates cell division by slowing mitosis, repairing DNA errors or triggering apoptosis. When mutated, uncontrolled cell growth can lead to cancer. HSC Biology exams assess students on explaining how mutations in tumour suppressor genes (e.g., p53) and proto-oncogenes contribute to cancer development.
- Epidemiology
- The study of the distribution, patterns and determinants of disease in populations. NESA Module 8 expects HSC students to interpret epidemiological data including incidence rates, prevalence and trends over time to draw conclusions about disease risk factors.
- Autoimmune disease
- A condition in which the immune system mistakenly attacks the body's own healthy cells and tissues. HSC Biology Module 8 requires students to name examples such as type 1 diabetes and rheumatoid arthritis and explain how loss of self-tolerance leads to tissue damage.
- Genetic predisposition
- An inherited increase in the likelihood of developing a particular disease due to specific alleles or gene combinations, though environmental factors also influence whether the disease manifests. NESA expects HSC students to distinguish genetic predisposition from genetic determination in Module 8 extended responses.
- Carcinogen
- An agent capable of causing cancer by damaging DNA and disrupting normal cell division regulation, including chemical substances (asbestos, tobacco), radiation (UV, ionising) and some biological agents. HSC Biology trial exams test students on identifying carcinogens and explaining the multi-step nature of cancer development.
Sample Flashcards
Q1: Define homeostasis and explain why it is essential.
Homeostasis is the maintenance of a relatively stable internal environment despite changes in external conditions. It is essential because enzymes and cellular processes require specific conditions (temperature, pH, glucose levels) to function optimally.
Q2: Compare negative and positive feedback.
Negative feedback: the response counteracts the change, returning the system to its set point (maintains stability). Positive feedback: the response amplifies the change, pushing the system further from the set point (rare, used for rapid completion of processes).
Q3: Describe how the body regulates temperature when overheated.
When body temperature rises: 1) Thermoreceptors detect the increase. 2) Hypothalamus (control centre) triggers responses. 3) Effectors: vasodilation (blood vessels dilate to increase heat loss through skin), sweating (evaporation cools skin), reduced metabolic rate. Temperature returns to set point (~37°C).
Q4: Explain how insulin and glucagon regulate blood glucose levels.
After eating (high glucose): beta cells of the pancreas release insulin → promotes glucose uptake by cells and glycogen storage in the liver → blood glucose falls. During fasting (low glucose): alpha cells release glucagon → promotes glycogen breakdown (glycogenolysis) in liver → blood glucose rises. This is negative feedback.
Q5: What is the endocrine system and how does it differ from the nervous system?
The endocrine system uses hormones (chemical messengers) secreted by glands into the bloodstream to regulate body functions. Compared to the nervous system: endocrine is slower, longer-lasting, uses chemical signals via blood, and affects widespread targets. The nervous system is fast, short-lived, uses electrical impulses via neurons, and targets specific cells.
Q6: Describe the structure and function of a neuron.
A neuron has: dendrites (receive signals), cell body (contains nucleus), axon (transmits electrical impulse), myelin sheath (insulates axon, speeds transmission), and axon terminals/synaptic knobs (release neurotransmitters). Neurons transmit electrical impulses (action potentials) along their length and chemical signals (neurotransmitters) across synapses.
Q7: What are non-infectious diseases and what causes them?
Non-infectious diseases are conditions NOT caused by pathogens and NOT transmissible between organisms. Causes include: genetics (inherited mutations), lifestyle factors (diet, smoking, alcohol, inactivity), environmental factors (pollution, radiation), and aging (degenerative conditions).
Q8: Describe atherosclerosis and its consequences.
Atherosclerosis is the buildup of fatty plaques (cholesterol, lipids, calcium) inside artery walls. This narrows the lumen, reducing blood flow and increasing blood pressure. Consequences: angina (chest pain), heart attack (blocked coronary artery), stroke (blocked cerebral artery), peripheral artery disease.
Sample Quiz Questions
Q1: Homeostasis maintains a perfectly constant internal environment.
Answer: FALSE
Homeostasis maintains a RELATIVELY stable (not perfectly constant) internal environment. Variables fluctuate around a set point within a normal range.
Q2: Negative feedback amplifies changes to push the system further from its set point.
Answer: FALSE
Negative feedback COUNTERACTS changes to return the system to its set point. POSITIVE feedback amplifies changes.
Q3: Vasodilation increases blood flow near the skin surface to promote heat loss.
Answer: TRUE
Vasodilation widens blood vessels near the skin, increasing blood flow to the surface. Heat is lost to the environment through radiation and convection.
Q4: Glucagon is released by the pancreas when blood glucose levels are too high.
Answer: FALSE
Glucagon is released when blood glucose is too LOW. It promotes glycogen breakdown to raise blood glucose. INSULIN is released when glucose is too high.
Q5: Hormones travel through the bloodstream to reach their target cells.
Answer: TRUE
Hormones are chemical messengers secreted by endocrine glands into the bloodstream. They travel throughout the body but only affect target cells with specific receptors.
Why It Matters
Non-infectious Disease and Disorder rounds out the HSC Biology course by examining diseases caused by genetics, lifestyle and environmental factors rather than pathogens. This module tests your ability to analyse epidemiological data, evaluate treatment technologies and discuss the social implications of genetic screening. Because it draws on knowledge from heredity, genetic change and immunity, it often appears in synoptic exam questions that require you to integrate concepts from across the entire course — making it critical for achieving top marks. Cancer biology links directly back to Module 5 (DNA replication errors) and Module 6 (mutations in proto-oncogenes and tumour suppressor genes), making this module ideal for demonstrating cross-module integration. Epidemiological data interpretation and ethical evaluation of genetic screening technologies frequently appear in the HSC Biology extended-response section, often worth 7-8 marks.
Key Concepts
Genetic Diseases and Predisposition
Conditions like cystic fibrosis (autosomal recessive) and Huntington's disease (autosomal dominant) illustrate how gene mutations cause disease. Understanding the difference between single-gene disorders and multifactorial diseases — where genetics interacts with environment — is essential for extended responses.
Lifestyle and Environmental Diseases
Cardiovascular disease, type 2 diabetes and lung cancer are influenced by diet, exercise, smoking and environmental exposure. Exam questions often ask you to evaluate the relative contribution of genetic predisposition versus lifestyle choices in disease development.
Cancer Biology
Cancer results from uncontrolled cell division caused by mutations in proto-oncogenes and tumour suppressor genes. Understanding the multi-hit hypothesis, the difference between benign and malignant tumours, and how metastasis occurs is frequently tested in short-answer questions.
Epidemiology and Prevention Technologies
Epidemiological studies track disease patterns in populations. Knowing how to interpret incidence and prevalence data, evaluate screening programs, and discuss technologies like gene therapy, stem cells and targeted drug therapy will prepare you for data-analysis and discussion questions.
Common Mistakes to Avoid
- Stating that genetic diseases are entirely determined by genes without considering environmental influences — NESA HSC Biology Module 8 requires students to explain the gene-environment interaction, noting that genetic predisposition increases risk but lifestyle and environmental factors often determine whether disease develops.
- Confusing proto-oncogenes with oncogenes — proto-oncogenes are normal genes that promote cell growth, while oncogenes are mutated versions that drive uncontrolled division. HSC Biology examiners penalise responses that fail to distinguish the normal gene from its mutated cancer-causing form.
- Treating cancer as a single disease rather than a multi-step process — NESA expects HSC students to explain that cancer requires multiple mutations accumulating over time in genes controlling cell division, and that a single mutation is rarely sufficient to cause cancer.
- Failing to link non-infectious disease content back to earlier modules — HSC Biology extended-response questions in Module 8 reward students who connect cancer biology to DNA replication errors (Module 5) and mutation types (Module 6), demonstrating integrated understanding across the syllabus.
- Presenting only one perspective in ethical evaluation questions about genetic screening — NESA HSC Biology marking criteria for Module 8 require balanced discussion of benefits (early detection, informed decisions) and concerns (discrimination, psychological impact, privacy) for full marks.
Study Tips
- Create a disease comparison chart covering genetic, lifestyle and environmental examples — include cause, risk factors, prevention and treatment for each.
- Practise interpreting epidemiological graphs showing disease trends over time — identify patterns and suggest explanations using biological principles.
- Link cancer biology back to Module 5 (DNA replication errors) and Module 6 (mutations) — cross-module connections earn higher marks.
- Prepare balanced arguments for ethical discussion questions on genetic screening, prenatal testing and gene therapy — include social, economic and scientific perspectives.
- Use spaced-repetition flashcards to consolidate disease names, risk factors and treatment options — active recall is especially effective for the volume of factual content in this module.
- Before your exam, work through the practice questions in this set at least twice using spaced repetition. Testing yourself repeatedly is the most effective revision strategy for long-term retention.
Related Topics
Frequently Asked Questions
What does HSC Biology Module 8 cover?
Module 8 covers non-infectious diseases including homeostasis, feedback mechanisms, the endocrine and nervous systems, cardiovascular disease, cancer, diabetes, genetic disorders, and related medical technologies.
What is the difference between infectious and non-infectious disease?
Infectious diseases are caused by pathogens (bacteria, viruses, etc.) and can be transmitted between organisms. Non-infectious diseases are not caused by pathogens and cannot spread — they result from genetics, lifestyle, environment or aging.
What technologies are studied in Module 8?
Technologies include medical imaging (CT, MRI, PET scans), gene therapy, stem cell research, epidemiological methods, and preventative healthcare technologies used to manage non-infectious diseases.
Last updated: March 2026 · 20 flashcards · 20 quiz questions · Content aligned to the NESA Syllabus