IB Biology HL C2.2.14 Hl Summation Questions
Practise IB Biology HL 2.2.14 by applying summation concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Distinguish excitatory inputs that depolarize a postsynaptic neuron from inhibitory inputs that hyperpolarize it.
- Explain how excitatory and inhibitory postsynaptic potentials combine through temporal or spatial summation.
- Relate the summed postsynaptic potential to reaching threshold and generating an action potential or response.
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IB Biology HL C2.2.14 Hl Summation Questions 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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