DP Biology (last assessment 2024)

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Question 19N.3.HL.TZ0.b

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.3.HL.TZ0.b
Level HL Paper 3 Time zone TZ0
Command term Describe Question number b Adapted from N/A
b.
[Maximum mark: 3]
19N.3.HL.TZ0.b

Prior to the 1840s, doctors and dentists did not routinely use anesthesia when operating on patients. However, advances in the knowledge of neurotransmitters have assisted the use of anesthesia.

Describe how local anesthetics act on the nervous system.

[3]

Markscheme

a. interfere with neural transmission between areas of sensory perception and the CNS ✔

b. blocks nerve transmission/impulses to pain centres in the CNS ✔

c. inhibit the function of an ion channel «sodium channel» in nerve cells ✔ OWTTE

d. no changes in awareness/consciousness/sense perception in other areas ✔ Accept vice versa

e. suppress excitatory synaptic transmission ✔

f. some increase the intensity of inhibitory synaptic transmission ✔

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