Report an issue

IB Biology Topic C2.2 Neural Signalling Revision… | RevisionDojo

FeaturesSubjectsPricing Schools

Loading subject…

A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB
C2.2 Neural signalling

C2.2A Neurons, resting and action potentials, and impulse speed

Key Definitions

Back to topic notes

Subtopics and learning objectives

C2.2.1 Neurons as cells within the nervous system that carry electrical impulses

C2.2B Synapses and neurotransmitter release

Neurons Are Specialised Cells That Carry Electrical Impulses Through the Nervous System

Neurons are specialised cells of the nervous system that carry electrical impulses.
Their structure lets them receive, integrate, and send signals rapidly.

Analogy

When you touch a hot stove, your hand pulls away almost instantly.
That speed is possible because neurons carry electrical impulses across your body.

A Neuron Has Three Main Parts, Each Matched to a Job

A neuron consists of dendrites, a cell body, and an axon.
The dendrites are short branched fibres that receive signals from other neurons or sensory receptors.

Unlock the rest of this chapter with a free account

Sign up for a free account to keep reading.

C2.2.1 Neurons as cells within the nervous system that carry electrical impulses
C2.2.2 Generation of the resting potential by pumping
C2.2.3 Nerve impulses as action potentials that are propagated along nerve fibres
C2.2.4 Variation in the speed of nerve impulses

Previous

No previous group

Next