Resting Membrane Potential
... 2. What must happen before sodium can rush into the axon? 3. Why does potassium leave the neuron during ...
... 2. What must happen before sodium can rush into the axon? 3. Why does potassium leave the neuron during ...
Membrane Transport
... – Overall not limited by size, charge, or hydrophilia – Is highly selective for specific needed molecules – Rate is fast and not linear ...
... – Overall not limited by size, charge, or hydrophilia – Is highly selective for specific needed molecules – Rate is fast and not linear ...
A. What is a neuron? 1. A neuron is a type of cell that receives and
... is soon adjusted by the sodium-potassium pumps to the neuron's original concentration gradient). 9. Local anesthetic drugs (e.g., Novocain, Xylocaine, etc.) hinder the occurrence of action potentials by blocking voltage-activated Na+ gates (preventing Na+ from entering a membrane). 10. General anest ...
... is soon adjusted by the sodium-potassium pumps to the neuron's original concentration gradient). 9. Local anesthetic drugs (e.g., Novocain, Xylocaine, etc.) hinder the occurrence of action potentials by blocking voltage-activated Na+ gates (preventing Na+ from entering a membrane). 10. General anest ...
Nervous Tissue - Manasquan Public Schools
... Two Kinds of Nerve Fibers dendrites - neurons usually contain many axons - neurons contain only one ...
... Two Kinds of Nerve Fibers dendrites - neurons usually contain many axons - neurons contain only one ...
nervous system
... yet it's the most complex of all known living structures. Up to one trillion nerve cells work together and coordinate the physical actions and mental processes that set humans apart from other species. ...
... yet it's the most complex of all known living structures. Up to one trillion nerve cells work together and coordinate the physical actions and mental processes that set humans apart from other species. ...
Tutorial 9: Excitatory Postsynaptic Potentials
... indicate that the active electrical properties of different regions of an individual neuron are remarkably complex, dynamic, and for the most part impossible to predict based on our current models. Improvements in multi-site recording will eventually provide a more complete picture of synaptic integ ...
... indicate that the active electrical properties of different regions of an individual neuron are remarkably complex, dynamic, and for the most part impossible to predict based on our current models. Improvements in multi-site recording will eventually provide a more complete picture of synaptic integ ...
Developer Notes
... outside the cell. This difference is maintained by energy using protein “pumps” that transport ions across the cell membrane. Without the action of the pumps the amounts of positive and negative ions inside and outside the cell would be equal; there would be no net charge. However, with the action o ...
... outside the cell. This difference is maintained by energy using protein “pumps” that transport ions across the cell membrane. Without the action of the pumps the amounts of positive and negative ions inside and outside the cell would be equal; there would be no net charge. However, with the action o ...
Membrane Structure & Function
... i = ionization constant (For sucrose this is 1.0 because sucrose does not ionize in water.) ...
... i = ionization constant (For sucrose this is 1.0 because sucrose does not ionize in water.) ...
CLASS #1: 9 Jan 2001
... directions constantly; absol ref per + duration of APsets top frequency. ● conduction velocity = speed of conduction of action potential down the axon; depends on diameter of axon and how it is myelinated; varies from ~0.3 meters/sec to ~120 meters/sec! ** IONS are electrically-charged molecules: ca ...
... directions constantly; absol ref per + duration of APsets top frequency. ● conduction velocity = speed of conduction of action potential down the axon; depends on diameter of axon and how it is myelinated; varies from ~0.3 meters/sec to ~120 meters/sec! ** IONS are electrically-charged molecules: ca ...
Sending Messages:
... A weak stimulus can be perceived as a sensation; strong stimuli are perceived as pain. How the brain perceives the stimulus depends on two factors: ...
... A weak stimulus can be perceived as a sensation; strong stimuli are perceived as pain. How the brain perceives the stimulus depends on two factors: ...
Nervous System Notes
... – All thanks to Na+/K+ pump – Can’t respond to another stimulus during this period ...
... – All thanks to Na+/K+ pump – Can’t respond to another stimulus during this period ...
03/05 PPT
... • Slit has a role in axon guidance at the midline. • Receptor (Robo) is expressed by axons that run longitudinally and never cross the midline. • In Robo mutants axons freely cross the midline. • Commissural axons up-regulate Robo after they have crossed the midline ...
... • Slit has a role in axon guidance at the midline. • Receptor (Robo) is expressed by axons that run longitudinally and never cross the midline. • In Robo mutants axons freely cross the midline. • Commissural axons up-regulate Robo after they have crossed the midline ...
a14b NeuroPhysII
... Threshold Stimulus Subthreshold stimulus—weak local depolarization that does not reach ...
... Threshold Stimulus Subthreshold stimulus—weak local depolarization that does not reach ...
Cell Architecture
... • Proteins targeted for different points in the cell are modified differently • Secretory proteins • Plasma membrane proteins • Membrane or soluble proteins to other organelles ...
... • Proteins targeted for different points in the cell are modified differently • Secretory proteins • Plasma membrane proteins • Membrane or soluble proteins to other organelles ...
How to get on the right track
... cycle, they must migrate to their appropriate location and send out processes to make functional connections with their target cells. A crucial step is determining which process will become the signal-conducting component, the axon, and which processes will become the input components, the dendrites ...
... cycle, they must migrate to their appropriate location and send out processes to make functional connections with their target cells. A crucial step is determining which process will become the signal-conducting component, the axon, and which processes will become the input components, the dendrites ...
Neuroanatomy PP - Rincon History Department
... Neural communication cont’d The neural membrane only allows certain ions through the membrane. Positively charged sodium and potassium ions and negatively charged chloride ions flow back and forth across the cell membrane, but they do not cross at the same rate. The difference in the flow leads to ...
... Neural communication cont’d The neural membrane only allows certain ions through the membrane. Positively charged sodium and potassium ions and negatively charged chloride ions flow back and forth across the cell membrane, but they do not cross at the same rate. The difference in the flow leads to ...
The nerve A nerve is an enclosed, cable
... dense sheath of connective tissue, the epineurium. Underlying this is a layer of flat cells, the perineurium, which forms a complete sleeve around a bundle of axons. Perineurial septae extend into the nerve and subdivide it into several bundles of fibres. Surrounding each such fibre is the endoneuri ...
... dense sheath of connective tissue, the epineurium. Underlying this is a layer of flat cells, the perineurium, which forms a complete sleeve around a bundle of axons. Perineurial septae extend into the nerve and subdivide it into several bundles of fibres. Surrounding each such fibre is the endoneuri ...
01 Physiology as the science. Bioelectrical phenomena in nerve
... Forces that determine ionic movement Electrostatic forces Opposite charges attract Identical charges repel Concentration forces Diffusion – movement of ions through semipermeable membrane Osmosis – movement of water from region of high concentration to low ...
... Forces that determine ionic movement Electrostatic forces Opposite charges attract Identical charges repel Concentration forces Diffusion – movement of ions through semipermeable membrane Osmosis – movement of water from region of high concentration to low ...
87881e9f4bc5cca
... Channels that are sometimes open and sometimes shut are said to be gated. When a gap junction channel contacts another on another cell, its gate opens and solute can pass through at other times the gate is shut. The usefulness of gating is obvious: if the gap junction channels not contacting others ...
... Channels that are sometimes open and sometimes shut are said to be gated. When a gap junction channel contacts another on another cell, its gate opens and solute can pass through at other times the gate is shut. The usefulness of gating is obvious: if the gap junction channels not contacting others ...
Synaptic Potentials
... when neurotransmitter binding to receptors leads to the opening of ion channels. An excitatory postsynaptic potential (EPSP) occurs if the ion movement depolarizes the membrane. If, on the other hand, the membrane becomes hyperpolarized when the ions move, an inhibitory postsynaptic potential (IPSP) ...
... when neurotransmitter binding to receptors leads to the opening of ion channels. An excitatory postsynaptic potential (EPSP) occurs if the ion movement depolarizes the membrane. If, on the other hand, the membrane becomes hyperpolarized when the ions move, an inhibitory postsynaptic potential (IPSP) ...
functional nervous system power point
... – Sodium-potassium pump • Active transport mechanism in plasma membrane that transports sodium (Na+) and potassium (K+) ions in opposite directions and at different rates • Maintains an imbalance in the distribution of positive ions, resulting in the inside surface becoming slightly negative compare ...
... – Sodium-potassium pump • Active transport mechanism in plasma membrane that transports sodium (Na+) and potassium (K+) ions in opposite directions and at different rates • Maintains an imbalance in the distribution of positive ions, resulting in the inside surface becoming slightly negative compare ...
Neuron File
... signals to other neurons are transmitted by the axon. A typical synapse, then, is a contact between the axon of one neuron and a dendrite or soma of another. Synaptic signals may be excitatory or inhibitory. If the net excitation received by a neuron over a short period of time is large enough, the ...
... signals to other neurons are transmitted by the axon. A typical synapse, then, is a contact between the axon of one neuron and a dendrite or soma of another. Synaptic signals may be excitatory or inhibitory. If the net excitation received by a neuron over a short period of time is large enough, the ...
CLINICAL SOCIETY MEETING 30-01-2015
... Right ovary shows features of Adult Granulosa Cell Tumor – Stage IA (T1a Nx Mx)* • Suggested further immuno histochemical studies for alpha-inhibin, CD99 & calretinin for definite diagnosis. ...
... Right ovary shows features of Adult Granulosa Cell Tumor – Stage IA (T1a Nx Mx)* • Suggested further immuno histochemical studies for alpha-inhibin, CD99 & calretinin for definite diagnosis. ...
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.