A-Level Psychology: The Nervous System

Biopsychology begins with wiring: the divisions of the nervous system, the neurons that carry its signals, and the chemical events at the synapse. Exam questions here reward anatomical and functional precision, and this quiz is built for exactly that.

The systems questions map the hierarchy: central versus peripheral, the peripheral system's somatic and autonomic divisions tested both as components and through their functional contrast (voluntary external action versus involuntary internal regulation), and the sympathetic-parasympathetic split, with the parasympathetic system's rest-and-digest role tested directly.

The neuron questions cover the three types — sensory neurons carrying impulses from receptors to the CNS, relay neurons linking sensory to motor within the CNS, and motor neurons carrying commands out to effectors — plus the direction of transmission through a neuron from dendrites to axon terminal. One question was corrected during verification to credit every true statement about neuron function, a reminder of how precisely this content must be stated.

The synapse questions test transmission at A-level depth: what happens when a neurotransmitter binds (ion channels opening), the distinction between excitatory depolarisation and inhibitory hyperpolarisation, and summation as the integration of competing potentials that decides whether the threshold is reached.

The endocrine questions cover the pituitary as master gland and the fight-or-flight response, with the adrenal medulla's release of adrenaline tested as the mechanism. Each explanation traces the signal path involved, building the process-level answers biopsychology questions demand.

• Map the nervous system's divisions and their functional contrasts
• Specify the roles and pathways of sensory, relay and motor neurons
• Explain synaptic transmission: binding, EPSPs, IPSPs and summation
• Describe the endocrine system and the pituitary's master-gland role
• Trace the fight-or-flight response through the adrenal medulla and adrenaline

Covers the compulsory Biopsychology content of A-level Psychology: divisions of the nervous system, neuron types and structure, synaptic transmission with excitation, inhibition and summation, the endocrine system and fight-or-flight.