20 Questions
Which of the following cells are not electrically excitable?
Astrocytes
Which type of cells make up about half the volume of the nervous system?
Astrocytes
Which type of cells can multiply and divide?
Astrocytes
Which type of cells are responsible for nourishing neurons?
Astrocytes
Which type of cells are found in both the central and peripheral nervous systems?
Microglia
Which type of cells form myelin in the central nervous system?
Oligodendrocytes
Which type of cells perform immune and scavenging functions in the nervous system?
Microglia
Which type of cells are involved in the formation of the blood-brain barrier?
Astrocytes
Which type of cells are responsible for supporting and nourishing neuron cell bodies in the peripheral nervous system?
Satellite cells
Which type of cells line the ventricles of the brain and produce cerebrospinal fluid?
Ependymal cells
What type of potentials occur in response to the opening of mechanically-gated or ligand-gated ion channels?
Graded potentials
What factors affect the propagation speed of action potentials?
Axon diameter and amount of myelination
What type of potential occurs when a sensory neuron receptor is excited by a form of energy like heat or light?
Receptor potential
What is the main purpose of the myelin sheath?
Insulates and protects the axon
Which type of neuron is most commonly found in the brain, spinal cord, and ganglia?
Multiple dendrites, single axon, and multiple branches at the end of the axon
Which cells allow complex functions of the nervous system such as sensing, thinking, remembering, and controlling muscle activity?
Neurons
What effect does higher temperature have on the speed of action potential propagation?
It increases the speed of action potential propagation
What are the two classes of neurotransmitters based on size?
Small-molecule neurotransmitters and neuropeptides
What is the junction between neurons or between a neuron and an effector called?
Synapse
How do neurons communicate with chemical messengers?
Through neurotransmitters
Test your knowledge on signal transmission at synapses and the role of neurotransmitters in neuron communication. Learn about electrical synapses, chemical synapses, and the effects of temperature on AP propagation.
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