Voorbeeld 2 van de 7 pagina's
Voorbeeld 2 van de 7 pagina's
gesponsord bericht van onze partner
Titel boek:
Auteur(s):
Enkele voorbeelden uit deze set oefenvragen
1.
What are neuroglia/glial cells
Antwoord: Supporting cells that aid the function of neurons and participate in metabolic and bioelectrical processes
2.
How many types of neuroglia are in the peripheral nervous system (PNS)? Central nervous system (CNS)?
Antwoord: PNS: 2 CNS: 4
3.
What are the types and functions of the PNS neuroglia?
Antwoord: 1. Schwann Cells: Form myelin sheaths around PNS axons 2. Satellite Cells: Support neuron bodies within the ganglia of the PNS
4.
What are the types and functions of the CNS neuroglia?
Antwoord: 1. Oligodendrocytes: Form myelin sheaths around CNS axons 2. Microglia: Migrate through CNS and phagocytose foreign and degenerated material 3. Astrocytes: Help regulate external environment of CNS neurons 4. Ependymal Cells: Epithelial cells that line ventricles of the brain and central canal of the spinal cord
5.
What are the 3 parts of a neuron and their functions?
Antwoord: 1. Cell Body (Soma): Contains the nucleus; synthesizes most neuronal proteins 2. Dendrites: \"Mailbox\"; receives and processes incoming signals which can be excitatory (generates action potential) or inhibitory (prevents action potential) 3. Axons: \"Axon Away\"; conducts impulses called action potentials away from the cell body; can insulted by myelin sheath to increase impulse conduction
6.
What are the 3 main functions of a neuron?
Antwoord: 1. Receive signals and information 2. Integrate incoming signals 3. Communicate signals to target cells
7.
What are the 3 FUNCTIONAL classes of neurons and their main functions?
Antwoord: 1. Sensory (afferent): conducts impulses from sensory receptors into the CNS 2. Motor (efferent–think I need to put EFFORT into moving): conducts impulses out of the CNS to effector organs like muscles and glands 3. Interneuron: located entirely within the CNS and serve associative/integrative functions
8.
What are all axons in the PNS surrounded by?
Antwoord: A living sheath of schwann cells
9.
How does a myelin sheath form in the PNS?
Antwoord: - Schwann cells attach to and wrap around the axon over and over in the same spot to create layers - The myelin sheath is made up of the schwann cells\' membranes (neurilemma) - Cytoplasm is forced into the outer region of the schwann cell - They leave 1 mm gaps of exposed axon between adjacent schwann cells called nodes of Ranvier which produce action potentials
10.
What is the difference between myelinated and unmyelinated axons of the PNS?
Antwoord: 1. Myelinated axons are surrounded by a living sheath of neurilemma and conduct action potentials much faster than unmyelinated axons 2. Unmyelinated axons are still surrounded by schwann cells but lack to multiple wrappings of the schwann cell plasma membranes
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