IB Biology HL 2.2.14 Summation Question Bank
Practise IB Biology HL 2.2.14 by applying summation concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
C2.2.14 (HL)—Summation question 1
[Maximum number: 3]
Describe how decision-making in the central nervous system (CNS) can result from the interaction between the activities of excitatory and inhibitory presynaptic neurons at synapses.
a. several presynaptic neurons synapse with one postsynaptic neuron;
b. excitatory presynaptic neurons depolarize postsynaptic neurons whereas inhibitory presynaptic neurons hyperpolarize postsynaptic neurons;
c. some excitatory presynaptic neurons may not be able to depolarize/cause an action potential in the postsynaptic neuron alone;
d. usually many needed to cause postsynaptic transmission;
e. some inhibitory presynaptic neurons may block/cancel depolarization (in postsynaptic neuron);
f. postsynaptic action potential/response/decision making determined by summation of all signals;
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