Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

45. Nervous System

Neurons and Action Potentials

General Biology

45. Nervous System

Neurons and Action Potentials

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Multiple Choice

Which of the following statements about action potentials in neurons is correct?

Strong stimuli cause the amplitude of action potentials generated to increase.

The amplitude of an action potential depends on the type of neurotransmitter released.

Weak stimuli generate action potentials with higher amplitude than strong stimuli.

Action potentials are all-or-none events, and their amplitude does not change with stimulus strength.

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Verified step by step guidance

Understand the concept of action potentials: Action potentials are electrical signals generated by neurons to transmit information. They are characterized as 'all-or-none' events, meaning that once the threshold is reached, the action potential occurs with a consistent amplitude regardless of the strength of the stimulus.

Clarify the role of stimulus strength: While stronger stimuli can increase the frequency of action potentials (how often they occur), they do not affect the amplitude of individual action potentials. The amplitude remains constant once the threshold is surpassed.

Examine the incorrect statements: The first statement ('Strong stimuli cause the amplitude of action potentials generated to increase') is incorrect because amplitude does not change with stimulus strength. The second statement ('The amplitude of an action potential depends on the type of neurotransmitter released') is incorrect because neurotransmitters influence the likelihood of reaching the threshold but do not directly affect amplitude. The third statement ('Weak stimuli generate action potentials with higher amplitude than strong stimuli') is also incorrect because amplitude is independent of stimulus strength.

Identify the correct statement: The correct statement is 'Action potentials are all-or-none events, and their amplitude does not change with stimulus strength.' This reflects the fundamental property of action potentials in neurons.

Summarize the key takeaway: Action potentials are consistent in amplitude once triggered, and stimulus strength influences frequency, not amplitude. This ensures reliable signal transmission in the nervous system.