18 Questions
What is the primary function of neurons in the nervous system?
Processing, transferring, and storing information
Which type of cell does not have axons or dendrites?
Glial cells
What is the primary reason for the resting membrane potential in a neuron?
The presence of more open K+ channels than Na+ channels
What is the main difference between the central nervous system and peripheral nervous system in terms of glial cells?
The central nervous system has oligodendrocytes, astrocytes, ependymal and microglia, while the peripheral nervous system has Schwann cells and satellite cells
What is the term for the membrane potential of a neuron that is not transmitting signals?
Resting membrane potential
What is the ratio of glial cells to neurons in the nervous system?
3:1
What is the primary function of the dura mater in the central nervous system?
To restrict the movement of the brain within the skull and keep in cerebrospinal fluid
Which of the following best describes the peripheral nervous system?
The system that consists of the nerves and ganglia outside the brain and spinal cord
What is the function of the cerebrospinal fluid between the pia mater and arachnoid mater?
To help protect the brain and spinal cord from sudden impact or injury
What is the function of the pia mater in the central nervous system?
To contain blood vessels and capillaries that nourish the brain
What is the arachnoid mater responsible for in the central nervous system?
To provide cushioning for the brain and spinal cord
What is the central nervous system (CNS) composed of?
The brain and spinal cord
What is the primary cause of depolarization during the depolarization phase of an action potential?
Opening of voltage-gated Na+ channels
During which phase of the action potential does the membrane potential return to its resting state?
Repolarization phase
What is the primary mechanism by which the membrane depolarizes further during the depolarization phase of an action potential?
Rapid influx of Na+ ions into the cell
What is the primary difference between the absolute and relative refractory periods?
The ability of the nerve fiber to respond to a stimulus
What is the voltage level at which depolarization occurs very rapidly during the depolarization phase of an action potential?
-55 mV
What is the term for the period during which a nerve fiber does not respond or responds subnormally to a stimulus of threshold intensity or greater than threshold intensity?
Refractory period
Learn about the Central Nervous System (CNS) and Peripheral Nervous System (PNS), including the brain, spinal cord, meninges, and protective structures. Understand the structure and function of the nervous system. Test your knowledge of Neuroscience fundamentals!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
