Chapter 04: The Action Potential
... • Return to membrane potential to a more negative potential than at rest ...
... • Return to membrane potential to a more negative potential than at rest ...
Presentación de PowerPoint
... Ion channels can be studied electrophysiologically (since the movement of ions produces a measurable electric ...
... Ion channels can be studied electrophysiologically (since the movement of ions produces a measurable electric ...
Snímek 1
... Schwann cell proliferation → bands of Büngner (guide for regenerating axon) neural cell body: swelling, peripheral displacement of nucleus, central chromatolysis Axonal regeneration 1 week after injury regenerating axon (axonal sprout) grows along bands of Büngner, grow rate 12mm per day scar tissue ...
... Schwann cell proliferation → bands of Büngner (guide for regenerating axon) neural cell body: swelling, peripheral displacement of nucleus, central chromatolysis Axonal regeneration 1 week after injury regenerating axon (axonal sprout) grows along bands of Büngner, grow rate 12mm per day scar tissue ...
lecture - McLoon Lab - University of Minnesota
... barrier Regulate local blood flow Contribute to neuronal metabolism via lactate shuttle & storing glucose as glycogen ...
... barrier Regulate local blood flow Contribute to neuronal metabolism via lactate shuttle & storing glucose as glycogen ...
Nervous System - Cloudfront.net
... 1. Electrical current travels down the axon 2. Vesicles with chemicals move toward the membrane what is that called? 3. Chemicals are released and diffuse toward the next cell’s plasma membrane 4. The chemicals open up the transport proteins and allow the signal to pass to the next cell - what type ...
... 1. Electrical current travels down the axon 2. Vesicles with chemicals move toward the membrane what is that called? 3. Chemicals are released and diffuse toward the next cell’s plasma membrane 4. The chemicals open up the transport proteins and allow the signal to pass to the next cell - what type ...
nervous system study guide
... SOMATIC VS AUTONOMIC NERVOUS SYSTEM What does each do? Which is involuntary? ...
... SOMATIC VS AUTONOMIC NERVOUS SYSTEM What does each do? Which is involuntary? ...
Tutorial 5: Sodium and Potassium Gradients at Rest
... concentration and electrical gradients for Na+ (maintained by active transport) result in an explosion of Na+ into the cell. This neuronal response to stimulation, the action potential, will be described in Tutorial 6. Advanced Structural and functional integrity of the membrane of a neuron is essen ...
... concentration and electrical gradients for Na+ (maintained by active transport) result in an explosion of Na+ into the cell. This neuronal response to stimulation, the action potential, will be described in Tutorial 6. Advanced Structural and functional integrity of the membrane of a neuron is essen ...
Nervous System - Uplift Education
... ◦ A quick switch in voltage potential (charge difference) across the membrane that travels all the way along the axon of the neuron ◦ Occurs due to flow of ions across the membrane ◦ All – or - nothing ...
... ◦ A quick switch in voltage potential (charge difference) across the membrane that travels all the way along the axon of the neuron ◦ Occurs due to flow of ions across the membrane ◦ All – or - nothing ...
Lecture #13 – Animal Nervous Systems
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
... along the axon by depolarizing adjacent regions of the membrane past the threshold • Depolarization zone travels in one direction only due to the refractory period (Na+ gates locked) ...
Nervous System
... communicate with other cells and organs Dendrites - receive signals from other neurons Myelin sheath - fatty coating on axon that speeds up action potential Nodes of Ranvier - gaps in the myelin sheath where the axon is exposed Cell body - part of neuron from which dendrites arise (also contains nuc ...
... communicate with other cells and organs Dendrites - receive signals from other neurons Myelin sheath - fatty coating on axon that speeds up action potential Nodes of Ranvier - gaps in the myelin sheath where the axon is exposed Cell body - part of neuron from which dendrites arise (also contains nuc ...
week4am
... see depolarization (change from negative inside neuron to more positive) ◦ “threshold” – if a great enough depolarization occurs, an action potential will occur ◦ action potential – very quick – milliseconds Other terms – spike, firing, generating an AP ...
... see depolarization (change from negative inside neuron to more positive) ◦ “threshold” – if a great enough depolarization occurs, an action potential will occur ◦ action potential – very quick – milliseconds Other terms – spike, firing, generating an AP ...
Title: Nervous System
... b) inhibitory – neurotransmitters that make membrane more negative (for example Gamma aminobutyric (GABA) and glycine). 7. Second messenger system (G-proteins). Binding of a signal molecule – into an intracellular response that modifies the behavior of target cell a) Phase I – binding of first messe ...
... b) inhibitory – neurotransmitters that make membrane more negative (for example Gamma aminobutyric (GABA) and glycine). 7. Second messenger system (G-proteins). Binding of a signal molecule – into an intracellular response that modifies the behavior of target cell a) Phase I – binding of first messe ...
chapter – 21
... 2. Explain the mechanism of reflex action? A. Reflex action is a spontaneous, involuntary response to the stimulus. • When thorn picks the hand the stimulus is received by a receptor in the skin. • Receptor sets sensory impulse and is carried to spinal cord through afferent neurons. • From there it ...
... 2. Explain the mechanism of reflex action? A. Reflex action is a spontaneous, involuntary response to the stimulus. • When thorn picks the hand the stimulus is received by a receptor in the skin. • Receptor sets sensory impulse and is carried to spinal cord through afferent neurons. • From there it ...
1. If a significant amount of Cl - entered the body of a motor neuron
... 15. When the sodium potassium pump breaks down a molecule of ATP, ______ K+ ions are moved into the cell and ______ Na+ are moved out of the cell. a. 2-3 b. 3-2 c. 3-4 d. 4-3 e. None of the above 16. The influx of sodium will cause the membrane potential of a neuron to: a. Increase b. Decrease c. S ...
... 15. When the sodium potassium pump breaks down a molecule of ATP, ______ K+ ions are moved into the cell and ______ Na+ are moved out of the cell. a. 2-3 b. 3-2 c. 3-4 d. 4-3 e. None of the above 16. The influx of sodium will cause the membrane potential of a neuron to: a. Increase b. Decrease c. S ...
nervous systems
... Neurons are specialized cells of the nervous system that receive, encode, and transmit information. Neurons with their support cells (glial cells) make up nervous systems. Modified neurons called sensory cells receive information and convert or transduce it into electrical signals that are transmitt ...
... Neurons are specialized cells of the nervous system that receive, encode, and transmit information. Neurons with their support cells (glial cells) make up nervous systems. Modified neurons called sensory cells receive information and convert or transduce it into electrical signals that are transmitt ...
08 - Pierce College
... a. Schwann cells and oligodendrocytes b. Astrocytes and oligodendrocytes c. Astrocytes and Schwann cells 74. How does saltatory conduction work? a. Myelin sheaths have ion channels that are triggered by the action potential of the neuron, thus increasing the numbers of ion channels at least one-hund ...
... a. Schwann cells and oligodendrocytes b. Astrocytes and oligodendrocytes c. Astrocytes and Schwann cells 74. How does saltatory conduction work? a. Myelin sheaths have ion channels that are triggered by the action potential of the neuron, thus increasing the numbers of ion channels at least one-hund ...
Class Notes 2
... In a cell at rest, the protoplasm streams around the cell at 100 u/sec. When the cell is damaged, an action potential is generated and the streaming stops. Protoplasmic streaming is produced by actinomyosin as found in animal muscle. Streaming is inhibited when Ca++ moves into the cytoplasm activat ...
... In a cell at rest, the protoplasm streams around the cell at 100 u/sec. When the cell is damaged, an action potential is generated and the streaming stops. Protoplasmic streaming is produced by actinomyosin as found in animal muscle. Streaming is inhibited when Ca++ moves into the cytoplasm activat ...
Nervous System
... the cell body are dendrites (depending on type, a neuron may have hundreds of dendrites) Processes that generate nerve impulses and conduct them away from the cell body are axons (only one axon) (some have a collateral branch along its length) (all branch to form hundreds to thousands of axonal term ...
... the cell body are dendrites (depending on type, a neuron may have hundreds of dendrites) Processes that generate nerve impulses and conduct them away from the cell body are axons (only one axon) (some have a collateral branch along its length) (all branch to form hundreds to thousands of axonal term ...
Ch. 10 Outline
... E. Brief period of hyperpolarization (-90) All-or-None Response A. If a neuron responds at all, it responds completely B. A nerve impulse is conducted whenever a stimulus of threshold intensity or above is applied to an axon C. All impulses carried on an axon are the same strength Refractory Period ...
... E. Brief period of hyperpolarization (-90) All-or-None Response A. If a neuron responds at all, it responds completely B. A nerve impulse is conducted whenever a stimulus of threshold intensity or above is applied to an axon C. All impulses carried on an axon are the same strength Refractory Period ...
File
... • The axon is a single long fiber that carries an impulse away from the cell body toward a different neuron. • This is the longest part of a neuron. • It generally does not branch until the very end, where it branches into many terminals. • Axons can be as long as a meter in certain areas. ...
... • The axon is a single long fiber that carries an impulse away from the cell body toward a different neuron. • This is the longest part of a neuron. • It generally does not branch until the very end, where it branches into many terminals. • Axons can be as long as a meter in certain areas. ...
File
... • Can be the end of a sensory neuron • Can be a specialized cell (such as light receptor or chemical receptor cells) that detect a specific stimulus and influence the activity of a sensory neuron ...
... • Can be the end of a sensory neuron • Can be a specialized cell (such as light receptor or chemical receptor cells) that detect a specific stimulus and influence the activity of a sensory neuron ...
The Nervous System
... • Neurons with myelin (or myelinated neurons) conduct impulses much faster than those without myelin. • Because fat (myelin) acts as an insulator, membrane coated with myelin will not conduct an impulse. • So, in a myelinated neuron, action potentials only occur along the nodes and, therefore, imp ...
... • Neurons with myelin (or myelinated neurons) conduct impulses much faster than those without myelin. • Because fat (myelin) acts as an insulator, membrane coated with myelin will not conduct an impulse. • So, in a myelinated neuron, action potentials only occur along the nodes and, therefore, imp ...
LEARNING GOALS - Cell Membranes
... Passive transport plays a primary role in the import of resources and the export of wastes. Membrane proteins play a role in facilitated diffusion of charged and polar molecules through a membrane. (Examples include glucose transport and Na+/K+ transport.) 3. External environments can be hypotonic, ...
... Passive transport plays a primary role in the import of resources and the export of wastes. Membrane proteins play a role in facilitated diffusion of charged and polar molecules through a membrane. (Examples include glucose transport and Na+/K+ transport.) 3. External environments can be hypotonic, ...
Unit 2 The Brain
... Question 5 • If an axon of a neuron is covered with myelin, which of the following is TRUE? – A. the action potential will move much slower down the axon – B. The action potential will move much faster down the axon – C. The neuron must be a sensory neuron – D. The threshold of excitation will incr ...
... Question 5 • If an axon of a neuron is covered with myelin, which of the following is TRUE? – A. the action potential will move much slower down the axon – B. The action potential will move much faster down the axon – C. The neuron must be a sensory neuron – D. The threshold of excitation will incr ...
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.