Supporting Cells - Net Start Class
... ► fatty covering formed by Schwann cells ► Nodes of Ranvier gap between Schwann cells serves as points along the neuron for generating a signal signals jumping from node to node travel hundreds of times faster than signals traveling along the surface of the axon. allows your brain to communi ...
... ► fatty covering formed by Schwann cells ► Nodes of Ranvier gap between Schwann cells serves as points along the neuron for generating a signal signals jumping from node to node travel hundreds of times faster than signals traveling along the surface of the axon. allows your brain to communi ...
No Slide Title
... – most abundant glial cells - form framework of CNS – contribute to blood-brain barrier and regulate composition of brain tissue fluid ...
... – most abundant glial cells - form framework of CNS – contribute to blood-brain barrier and regulate composition of brain tissue fluid ...
The Nervous System
... (Schwann Cells) – Increases speed of action potentials – Myelin insulates myelinated axons – Makes nerves appear white (white matter) ...
... (Schwann Cells) – Increases speed of action potentials – Myelin insulates myelinated axons – Makes nerves appear white (white matter) ...
nervous tissue organization neurons neuroglia action potentials
... - incoming stimulus generates action potential - AP travels down axon by saltatory conduction - AP deteriorates as it travels down axon - AP are reenergized at each node - AP occurs only at nodes - AP does not jump over nodes - fast conduction up to 120 m/sec (about 400 ft/sec) ...
... - incoming stimulus generates action potential - AP travels down axon by saltatory conduction - AP deteriorates as it travels down axon - AP are reenergized at each node - AP occurs only at nodes - AP does not jump over nodes - fast conduction up to 120 m/sec (about 400 ft/sec) ...
Nervous System Part 1
... Bind neurons together and form framework for nervous tissue In fetus, guide migrating neurons to their destination If mature neuron is not in synaptic contact with another neuron it is covered by glial cells Prevents neurons from touching each other Gives precision to conduction pathways ...
... Bind neurons together and form framework for nervous tissue In fetus, guide migrating neurons to their destination If mature neuron is not in synaptic contact with another neuron it is covered by glial cells Prevents neurons from touching each other Gives precision to conduction pathways ...
Neuron Notes Neuron- Cells that carry messages throughout the
... 1. cell body: largest part, contains nucleus and most of cytoplasm – most metabolic activity of cell occurs here 2. dendrites: spread out from cell body; short, branched extensions; carry impulses toward the cell body 3. axons: (transmit/send signals) long fiber that carries impulses away from cell ...
... 1. cell body: largest part, contains nucleus and most of cytoplasm – most metabolic activity of cell occurs here 2. dendrites: spread out from cell body; short, branched extensions; carry impulses toward the cell body 3. axons: (transmit/send signals) long fiber that carries impulses away from cell ...
nerves and glials - Central Connecticut State University
... • Supportive role. • Mature cells do replicate. • Dead cells are replaced. ...
... • Supportive role. • Mature cells do replicate. • Dead cells are replaced. ...
Neuro 1 - Somerset Academy
... – The Na+ channels automatically close – K+ channels begin to open K+ leaves the cell carrying with it the positive ...
... – The Na+ channels automatically close – K+ channels begin to open K+ leaves the cell carrying with it the positive ...
Cognitive Psychology
... result of synaptic activity; within the axon as a result of action potentials. ...
... result of synaptic activity; within the axon as a result of action potentials. ...
Ch 11 Part 2 - Groch Biology
... clusters of cell bodies PNS clusters of glial cells d. dendrites neurotransmitter in vessicles telodendria synaptic knobs e. gray matter myelin fiber tracts white matter 3. Check all of the following that apply to a resting neuron: ____ It's inside is negative relative to its outside. ____ It's outs ...
... clusters of cell bodies PNS clusters of glial cells d. dendrites neurotransmitter in vessicles telodendria synaptic knobs e. gray matter myelin fiber tracts white matter 3. Check all of the following that apply to a resting neuron: ____ It's inside is negative relative to its outside. ____ It's outs ...
Reading Notes 11
... causes sacs that contain _______________ to fuse with the membrane of the _______________ . These sacs, called _______________ ___________, release their contents into the synaptic cleft by _______________ . The neurotransmitters then diffuse across the synapse to reach the _______________ of the po ...
... causes sacs that contain _______________ to fuse with the membrane of the _______________ . These sacs, called _______________ ___________, release their contents into the synaptic cleft by _______________ . The neurotransmitters then diffuse across the synapse to reach the _______________ of the po ...
Nervous Tissue
... depolarization, the voltage of adjacent areas is effected and their voltage-gated Na+ channels open – self-propagating along the membrane ...
... depolarization, the voltage of adjacent areas is effected and their voltage-gated Na+ channels open – self-propagating along the membrane ...
File
... • Myelination is the presence of myelin around the neuron. Myelin is not part of the structure of the neuron but consists of a thick layer mostly made up of lipids, present at regular intervals along the length of the axon. • Such fibers are called myelinated fibers. • The water-soluble ions carryin ...
... • Myelination is the presence of myelin around the neuron. Myelin is not part of the structure of the neuron but consists of a thick layer mostly made up of lipids, present at regular intervals along the length of the axon. • Such fibers are called myelinated fibers. • The water-soluble ions carryin ...
Chapter 2: Biopsychology
... that allow Sodium to flow in. When sodium flows in the electrical charge is neutralized across the membrane. Then the sodium channels close, and potassium channels open, allowing potassium to leave the cell. ...
... that allow Sodium to flow in. When sodium flows in the electrical charge is neutralized across the membrane. Then the sodium channels close, and potassium channels open, allowing potassium to leave the cell. ...
Cells of the Nervous System
... form a segmental wrapping around nerve fibers each segment is produced by 1 Schwann cell gaps between cells = Nodes of Ranvier form neurilemma and myelin sheath in PNS neurons myelin (in CNS and PNS) can be: thick = “myelinated fibers”, “white matter” thin = “unmyelinated fibers”, “gray matter” oute ...
... form a segmental wrapping around nerve fibers each segment is produced by 1 Schwann cell gaps between cells = Nodes of Ranvier form neurilemma and myelin sheath in PNS neurons myelin (in CNS and PNS) can be: thick = “myelinated fibers”, “white matter” thin = “unmyelinated fibers”, “gray matter” oute ...
11_45_48_SG
... Threshold potential has been reached Repolarization occurs, Na gates close, and some K gates open Membrane is at resting potential ...
... Threshold potential has been reached Repolarization occurs, Na gates close, and some K gates open Membrane is at resting potential ...
neuron
... • arborisation (branching) increases receptive area of the cell (100 000 contacts and more) • dendritic spines (site of synapse - postsynaptic membrane, actin microfilaments • neurofilaments (NF-L, NF-M, NF-H), other cytoskeleton units, proteosynthetic apparatus except GA • always non- myelinated ...
... • arborisation (branching) increases receptive area of the cell (100 000 contacts and more) • dendritic spines (site of synapse - postsynaptic membrane, actin microfilaments • neurofilaments (NF-L, NF-M, NF-H), other cytoskeleton units, proteosynthetic apparatus except GA • always non- myelinated ...
Nervous System Lecture Notes Page
... Sodium-Potassium Pump moves Na+ out & K+ in (Requires Energy) ...
... Sodium-Potassium Pump moves Na+ out & K+ in (Requires Energy) ...
CH 12 shortened for test three nervous tissue A and P 2016
... - incoming stimulus generates action potential - AP travels down axon by saltatory conduction - AP deteriorates as it travels down axon - AP are reenergized at each node - AP occurs only at nodes - AP does not jump over nodes - fast conduction up to 120 m/sec ...
... - incoming stimulus generates action potential - AP travels down axon by saltatory conduction - AP deteriorates as it travels down axon - AP are reenergized at each node - AP occurs only at nodes - AP does not jump over nodes - fast conduction up to 120 m/sec ...
Neurons - Yavapai College
... Neurons • Neurons and neuroglia (multiple sclerosis and neuroglia) ...
... Neurons • Neurons and neuroglia (multiple sclerosis and neuroglia) ...
Study Guide for Nervous System
... a. Voltage and potential energy b. Current and resistance c. Role of Ion Channels i. Leaky, voltage gated, chemical (ligand) gated d. Resting potential characteristics (voltage and permeability to Na+, K+ and Cl-) e. Depolarization ...
... a. Voltage and potential energy b. Current and resistance c. Role of Ion Channels i. Leaky, voltage gated, chemical (ligand) gated d. Resting potential characteristics (voltage and permeability to Na+, K+ and Cl-) e. Depolarization ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.