Neurobiology and Immunology: overview of SQA Higher Human Biology Area 3
An overview of Area 3 of SQA Higher Human Biology, Neurobiology and Immunology, covering the divisions of the nervous system, the cerebral cortex, memory, synaptic transmission and neurotransmitters, non-specific and specific defences, immunisation and clinical trials, with study tips and links to each key area.
Reviewed by: AI editorial process; not yet individually human-reviewed
Neurobiology and Immunology is the third of the three areas of SQA Higher Human Biology. It covers how the nervous system is organised and processes information (the divisions of the nervous system, the cerebral cortex, memory and synaptic transmission) and how the body defends itself against disease (non-specific and specific defences, immunisation, and the clinical trials that test new treatments). This page maps the eight key areas and shows how they connect.
The eight key areas
- Divisions of the nervous system and neural pathways
- The central and peripheral nervous systems, the somatic and autonomic (antagonistic sympathetic and parasympathetic) divisions, and converging, diverging and reverberating pathways.
- The cerebral cortex
- Sensory, motor and association areas, localisation of function, the specialised left and right hemispheres, and the corpus callosum.
- Memory
- Sensory, short-term and long-term memory, the capacity and span of short-term memory, encoding by rehearsal, organisation and elaboration, and retrieval cues.
- The cells of the nervous system and neurotransmitters
- Neurons and glial cells, synaptic transmission and the removal of neurotransmitters, summation, endorphins and dopamine, and how drugs act as agonists and antagonists.
- Non-specific body defences
- Physical and chemical barriers, the inflammatory response (histamine, vasodilation, increased capillary permeability), and phagocytosis with cytokines.
- Specific cellular defences
- Antigens, B and T lymphocytes, antibody production, clonal selection, immunological memory, allergy and autoimmune disease.
- Immunisation
- Active and passive immunity, antigens and adjuvants in vaccines, herd immunity and the herd immunity threshold, and antigenic variation.
- Clinical trials of vaccines and drugs
- Randomisation, placebo and control groups, double-blind protocols, sample size and statistical significance, and the phases of testing.
How to study Area 3
- Learn the precise terminology. Higher rewards exact wording such as corpus callosum, summation, clonal selection and statistically significant.
- Connect the two halves. Neurotransmission and immunity share ideas (thresholds, memory), and autoimmune disease links the immune system back to other body systems.
- Master the sequences. Know the ordered steps of synaptic transmission, the inflammatory response and the primary and secondary immune responses.
- Practise the experimental design. Clinical-trial questions test the same inquiry skills (controls, randomisation, sample size) examined across the whole course.
For the official course specification
The SQA publishes the full Higher Human Biology course specification, specimen and past papers, and marking instructions at sqa.org.uk. Always revise from the current specification and SQA past papers.