The action potential and the synapses
... The potential is also characterized by two important parameters: Duration. In most cases, it corresponds to about 4-6 msec and depends by the kinetics of opening and subsequent obliteration of the voltage dependent Na + and K + channels, and thus by the specific channel subtypes (isoforms) expressed ...
... The potential is also characterized by two important parameters: Duration. In most cases, it corresponds to about 4-6 msec and depends by the kinetics of opening and subsequent obliteration of the voltage dependent Na + and K + channels, and thus by the specific channel subtypes (isoforms) expressed ...
Neurons and synapses..
... A brief recovery period occurs during which the nerve cell membrane cannot be stimulated to carry impulses. This refractory period lasts a few thousandths of a second. The rate at which an impulse travels depends on the size of the nerve and whether or not it is myelinated (unmyelinated = 2 m/s an ...
... A brief recovery period occurs during which the nerve cell membrane cannot be stimulated to carry impulses. This refractory period lasts a few thousandths of a second. The rate at which an impulse travels depends on the size of the nerve and whether or not it is myelinated (unmyelinated = 2 m/s an ...
Chapter 12: Neural Tissue
... A neurotransmitter’s (direct or indirect) effects on post-synaptic ion channels can either depolarize or hyperpolarize the post-synaptic cell, depending on which ions are involved. Opening post-synaptic sodium channels, as acetylcholine often does, spurs an influx of Na+ and depolarization of the po ...
... A neurotransmitter’s (direct or indirect) effects on post-synaptic ion channels can either depolarize or hyperpolarize the post-synaptic cell, depending on which ions are involved. Opening post-synaptic sodium channels, as acetylcholine often does, spurs an influx of Na+ and depolarization of the po ...
NERVE IMPULSE
... • There is a more rapid diffusion of potassium ions ______ of the nerve cell than potassium ions ______. • Therefore, net __________ of ions. • During resting potential, net _____________ charge on outside and net ________________ charge inside. • Resting membrane potential: polarized membrane. ...
... • There is a more rapid diffusion of potassium ions ______ of the nerve cell than potassium ions ______. • Therefore, net __________ of ions. • During resting potential, net _____________ charge on outside and net ________________ charge inside. • Resting membrane potential: polarized membrane. ...
ssep anatomy handout
... Peripheral nerves are classified into groups A, B and C. Group A has 4 sizes of nerve fibers Alpha, Beta, Gamma and Delta. They are all heavily myelinated and range in size from 2 - 20 microns (micrometer) and are as fast as 12 – 120 meters per second. Group B fibers have some myelin and are medium ...
... Peripheral nerves are classified into groups A, B and C. Group A has 4 sizes of nerve fibers Alpha, Beta, Gamma and Delta. They are all heavily myelinated and range in size from 2 - 20 microns (micrometer) and are as fast as 12 – 120 meters per second. Group B fibers have some myelin and are medium ...
Psychology`s biological roots: neurons and neural communication
... cleft the neurotransmitters attach or bind to receptors on the postsynaptic neuron These neurotransmitters can then make the receiving neuron either more or less likely to fire It is in this infinitesimally small space that irregularities can have profound effects ...
... cleft the neurotransmitters attach or bind to receptors on the postsynaptic neuron These neurotransmitters can then make the receiving neuron either more or less likely to fire It is in this infinitesimally small space that irregularities can have profound effects ...
Principles of Biology ______Lake Tahoe
... c. large organic negatively charged molecules and K+ movement out create most resting potential 9. There are also membrane proteins called sodium-potassium pumps that actively transport Na+ out of cell and K in, to help keep Na in cell low and K high. They move more Na+ out than K + in. B. Nerve sig ...
... c. large organic negatively charged molecules and K+ movement out create most resting potential 9. There are also membrane proteins called sodium-potassium pumps that actively transport Na+ out of cell and K in, to help keep Na in cell low and K high. They move more Na+ out than K + in. B. Nerve sig ...
Cellular Aspects - Labs - Department of Plant Biology, Cornell
... They were discovered in 1856 by Rudolf Virchow. The dendrites and cell bodies of the neurons make up the gray matter of the brain and the axons make up the white matter. ...
... They were discovered in 1856 by Rudolf Virchow. The dendrites and cell bodies of the neurons make up the gray matter of the brain and the axons make up the white matter. ...
CPB748_JK Nervous
... of ions across the plasma membrane cause the action potential to be propagated along the length of the axon. ...
... of ions across the plasma membrane cause the action potential to be propagated along the length of the axon. ...
The Nervous System
... 3. During the resting potential, Na+ ions are more concentrated on the outside of the membrane than the inside. 4. K+ ions are more concentrated on the inside of the axon. 5. This uneven distribution of K and Na ions is maintained by active transport across Na+/K+ pumps which operate whenever the n ...
... 3. During the resting potential, Na+ ions are more concentrated on the outside of the membrane than the inside. 4. K+ ions are more concentrated on the inside of the axon. 5. This uneven distribution of K and Na ions is maintained by active transport across Na+/K+ pumps which operate whenever the n ...
Build a neuron - Wake Forest University
... Depending on the age and background of the participants you may need to explain the following concepts: • The body is made up of cells. • Each body part has different kinds of cells that perform different functions. The body’s nervous system is made up of specialized cells called nerve cells or neur ...
... Depending on the age and background of the participants you may need to explain the following concepts: • The body is made up of cells. • Each body part has different kinds of cells that perform different functions. The body’s nervous system is made up of specialized cells called nerve cells or neur ...
The Nervous System
... ● acetylcholine: can be inhibitory or excitatory, depending on the receptor ● reduces the rate and strength of contraction of cardiac muscle cells ● biogenic amines are derived from amino acids o includes epinephrine and norepinephrine which function as ...
... ● acetylcholine: can be inhibitory or excitatory, depending on the receptor ● reduces the rate and strength of contraction of cardiac muscle cells ● biogenic amines are derived from amino acids o includes epinephrine and norepinephrine which function as ...
TABLE OF CONTENTS - Test Bank, Manual Solution, Solution Manual
... Cell body (soma): Contains the nucleus, ribosomes, mitochondria, and other structures found in most cells. Axon: A long, thin fiber (usually longer than dendrites), which is the information-sending part of the neuron, sending an electrical impulse toward other neurons, glands, or muscles. Myelin she ...
... Cell body (soma): Contains the nucleus, ribosomes, mitochondria, and other structures found in most cells. Axon: A long, thin fiber (usually longer than dendrites), which is the information-sending part of the neuron, sending an electrical impulse toward other neurons, glands, or muscles. Myelin she ...
1 - optometrie.ch
... Of related importance: The coverings of the brain and the subarachnoid space are continuous around the optic nerve. This is important in papilledema (as well as axoplamic flow), which is a swollen optic nerve head due to increased intracranial pressure. The Central Retinal Vein is compressed in the ...
... Of related importance: The coverings of the brain and the subarachnoid space are continuous around the optic nerve. This is important in papilledema (as well as axoplamic flow), which is a swollen optic nerve head due to increased intracranial pressure. The Central Retinal Vein is compressed in the ...
peripheral nervous system
... Depolarization makes the membrane potential more positive, whereas a hyperpolarization makes it more negative -These small changes result in graded potentials -Can reinforce or negate each other Summation is the ability of graded potentials to combine ...
... Depolarization makes the membrane potential more positive, whereas a hyperpolarization makes it more negative -These small changes result in graded potentials -Can reinforce or negate each other Summation is the ability of graded potentials to combine ...
Neuronal Signaling
... - Decreases time to charge the nearby membrane, increasing conduction velocity - Myelin increases the passive conduction distance (remember that larger Rm increases the length constant, lambda) - Myelin decreases the time to charge the membrane by decreasing Cm ...
... - Decreases time to charge the nearby membrane, increasing conduction velocity - Myelin increases the passive conduction distance (remember that larger Rm increases the length constant, lambda) - Myelin decreases the time to charge the membrane by decreasing Cm ...
PharmacologyLec 1 Central nervous system pharmacology
... Central nervous system pharmacology There are two reasons why understanding the action of drugs act on the central nervous system, the first is that centrally acting drugs are of therapeutic importance,the second reason is that the CNS is functionally far more complex than any other system in the bo ...
... Central nervous system pharmacology There are two reasons why understanding the action of drugs act on the central nervous system, the first is that centrally acting drugs are of therapeutic importance,the second reason is that the CNS is functionally far more complex than any other system in the bo ...
Motor Neuron - papbiobellaire
... to regeneration of neuron 6. Myelin sheath - lipid layer around axon; an insulator and also increases rate of impulse conduction 7. Axis cylinder - composed of neurofibrils - carry impulses throughout neuron 8. Nodes of Ranvier - spaces between Schwann cells 9. Motor end plate - (axon terminals) sit ...
... to regeneration of neuron 6. Myelin sheath - lipid layer around axon; an insulator and also increases rate of impulse conduction 7. Axis cylinder - composed of neurofibrils - carry impulses throughout neuron 8. Nodes of Ranvier - spaces between Schwann cells 9. Motor end plate - (axon terminals) sit ...
The Nervous System
... 2. Can neuroglia undergo action potentials? 3. The type of cell that carries nerve impulses in the nervous system is the ________________________. 4. The type of cell that nourishes, supports, and influences the activity of the neurons is the ________________. 5. The part of the neuron that brings i ...
... 2. Can neuroglia undergo action potentials? 3. The type of cell that carries nerve impulses in the nervous system is the ________________________. 4. The type of cell that nourishes, supports, and influences the activity of the neurons is the ________________. 5. The part of the neuron that brings i ...
The Nervous System
... • If the action potential (nerve impulse) starts, it is propagated over the entire axon (all or none response) • When the axon’s internal charge reaches + 40 millivolts, the Na+ channels close and the K+ channels open; potassium ions rush out of the neuron after sodium ions have entered. The K+ ions ...
... • If the action potential (nerve impulse) starts, it is propagated over the entire axon (all or none response) • When the axon’s internal charge reaches + 40 millivolts, the Na+ channels close and the K+ channels open; potassium ions rush out of the neuron after sodium ions have entered. The K+ ions ...
m5zn_363798b57fd4c88
... sodium channels is high. Thus, action potentials literally jump from one node to the next as they propagate along a myelinated fiber, and for this reason such propagation is called saltatory conduction. ...
... sodium channels is high. Thus, action potentials literally jump from one node to the next as they propagate along a myelinated fiber, and for this reason such propagation is called saltatory conduction. ...
The biological basis of behavior
... The synapse • Synapse: area composed of the axon terminal of one neuron, the synaptic space, and the dendrite or cell body of the next neuron. • Neurotransmitters: chemicals released by the synaptic vesicles that travel across the synaptic space and affect adjacent neurons. ...
... The synapse • Synapse: area composed of the axon terminal of one neuron, the synaptic space, and the dendrite or cell body of the next neuron. • Neurotransmitters: chemicals released by the synaptic vesicles that travel across the synaptic space and affect adjacent neurons. ...
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.