Nervous System Reading from SparkNotes
... Speeding Up the Action Potential Axons of many neurons are surrounded by a structure known as the myelin sheath, a structure that helps to speed up the movement of action potentials along the axon. The sheath is built of Schwann cells, which wrap themselves around the axon of the neuron, leaving sma ...
... Speeding Up the Action Potential Axons of many neurons are surrounded by a structure known as the myelin sheath, a structure that helps to speed up the movement of action potentials along the axon. The sheath is built of Schwann cells, which wrap themselves around the axon of the neuron, leaving sma ...
Nervous 1 Green
... -Major ions are K+ and Na+ (2) -These ions cross the membrane through sodium and potassium protein pumps (Na is pumped out, K is pumped in) (2) ...
... -Major ions are K+ and Na+ (2) -These ions cross the membrane through sodium and potassium protein pumps (Na is pumped out, K is pumped in) (2) ...
Your Nervous System
... impulse along length of axon All or None Principle – must reach a threshold level or the impulse dies Covered by a white covering called a myelin sheath (Schwann Cells), an insulator Myelin sheath causes the ion exchange to occur only at the nodes which speeds up the process For a short time after d ...
... impulse along length of axon All or None Principle – must reach a threshold level or the impulse dies Covered by a white covering called a myelin sheath (Schwann Cells), an insulator Myelin sheath causes the ion exchange to occur only at the nodes which speeds up the process For a short time after d ...
Lecture 3
... Na+ current the cell membrane. K+ current 2. Excitatory input causes the potential to decrease (depolarize). 3. This causes a voltage-sensitive mechanism to set off a rapid change in electrical potential in the membrane. 4. Action potentials move rapidly down the axon to the axon terminal. 5. Action ...
... Na+ current the cell membrane. K+ current 2. Excitatory input causes the potential to decrease (depolarize). 3. This causes a voltage-sensitive mechanism to set off a rapid change in electrical potential in the membrane. 4. Action potentials move rapidly down the axon to the axon terminal. 5. Action ...
11 - Karmayog .org
... This impulse is brought about by the movement of chemical ions either into or out of a neuron. - These ions have an electric charge this causes the flow of an electric current. - When it reaches a junction between two neurons (synapse). It causes the release of a neurotransmitters to stimulate the i ...
... This impulse is brought about by the movement of chemical ions either into or out of a neuron. - These ions have an electric charge this causes the flow of an electric current. - When it reaches a junction between two neurons (synapse). It causes the release of a neurotransmitters to stimulate the i ...
Unit Outline_Ch17 - Westgate Mennonite Collegiate
... Second, the gates of the potassium channels open, and potassium flows outside the axon. This repolarizes the axon. Conduction of an Action Potential The action potential travels down an axon one small section at a time. Transmission Across a Synapse Every axon branches into many fine endings, each t ...
... Second, the gates of the potassium channels open, and potassium flows outside the axon. This repolarizes the axon. Conduction of an Action Potential The action potential travels down an axon one small section at a time. Transmission Across a Synapse Every axon branches into many fine endings, each t ...
Normal Cellular Physiology
... c. clathrin-mediated endocytosis and caveolae-dependent uptake are the same process d. substance must be in solution for phagocytosis to occur 28. Which of the following is false regarding membrane permeability? a. patch clamping is an important method of studying membrane permeability b. gated ion ...
... c. clathrin-mediated endocytosis and caveolae-dependent uptake are the same process d. substance must be in solution for phagocytosis to occur 28. Which of the following is false regarding membrane permeability? a. patch clamping is an important method of studying membrane permeability b. gated ion ...
Nerve activates contraction
... both inside and outside the body The dendrite endings of the sensory neuron are usually associated with specialized ...
... both inside and outside the body The dendrite endings of the sensory neuron are usually associated with specialized ...
Tutorial 10: Temporal and Spatial Summation Figure 10: Temporal
... http://psych.athabascau.ca/html/Psych402/Biotutorials/10/intro.shtml?print ...
... http://psych.athabascau.ca/html/Psych402/Biotutorials/10/intro.shtml?print ...
Lecture 3 NS_2015
... potential of the postsynaptic membrane, determining excitation or inhibition The postsynaptic membrane has receptor proteins with 2 components: • A binding component/sites for ligands/neurotransmitters • An ionophore component that passes all the way through the postsynaptic membrane to the interior ...
... potential of the postsynaptic membrane, determining excitation or inhibition The postsynaptic membrane has receptor proteins with 2 components: • A binding component/sites for ligands/neurotransmitters • An ionophore component that passes all the way through the postsynaptic membrane to the interior ...
Dynamic Equilibrium Review 1. Describe the structure and function
... 1. Describe the structure and function of each component of a typical neuron. Dendrites – receive signal from other neurons or outside world (senses) Cell body – site of metabolic activity, most typical cellular processes happen here Axon – long strand branching off cell body, carries signal away fr ...
... 1. Describe the structure and function of each component of a typical neuron. Dendrites – receive signal from other neurons or outside world (senses) Cell body – site of metabolic activity, most typical cellular processes happen here Axon – long strand branching off cell body, carries signal away fr ...
Lange Physiology > Section II
... As noted above, axons conduct impulses in either direction. However, conduction at synapses procedes in only one direction, ie, orthodromic, because the neurotransmitter at the synapse is in the presynaptic and not in the postsynaptic cell. The one-way gate at the synapses is necessary for orderly ...
... As noted above, axons conduct impulses in either direction. However, conduction at synapses procedes in only one direction, ie, orthodromic, because the neurotransmitter at the synapse is in the presynaptic and not in the postsynaptic cell. The one-way gate at the synapses is necessary for orderly ...
The vertebrate nervous system is regionally specialized
... Neurons communicate with other cells at synapses – summary In an electrical synapse, electrical current flows directly from one cell to another via a gap junction. In a chemical synapse, depolarization of the synaptic terminal causes synaptic vesicles to fuse with the terminal membrane and to relea ...
... Neurons communicate with other cells at synapses – summary In an electrical synapse, electrical current flows directly from one cell to another via a gap junction. In a chemical synapse, depolarization of the synaptic terminal causes synaptic vesicles to fuse with the terminal membrane and to relea ...
Vertebrate Zoology BIOL 322/Nervous System and Brain Complete
... - ------ - - - - - - - - - (proteins inside = negative charge overall) K+ K+___________________________________ ...
... - ------ - - - - - - - - - (proteins inside = negative charge overall) K+ K+___________________________________ ...
Carrie Heath
... 1. What were the results of the experiments performed by Fatt and Katz when they did not stimulate the skeletal muscle of the frog and when they did stimulate the muscle? What can be concluded from the results of these two experiments? What was the purpose of using curare in this experiment? 2. What ...
... 1. What were the results of the experiments performed by Fatt and Katz when they did not stimulate the skeletal muscle of the frog and when they did stimulate the muscle? What can be concluded from the results of these two experiments? What was the purpose of using curare in this experiment? 2. What ...
Nervous System = communication conduit b/w brain
... Some axons have myelin sheath (insulating layer) Myelin sheath has gaps (nodes of Ranvier) along axon Na+/K+ cannot diffuse through myelin but they can reach plasma membrane at these nodes This allows action potential to jump from node to node, increasing speed of impulse as it travels lengt ...
... Some axons have myelin sheath (insulating layer) Myelin sheath has gaps (nodes of Ranvier) along axon Na+/K+ cannot diffuse through myelin but they can reach plasma membrane at these nodes This allows action potential to jump from node to node, increasing speed of impulse as it travels lengt ...
Document
... – A synapse is a region where neurons nearly touch – Small gap between neurons is the synaptic cleft – Transmission across a synapse is carried out by neurotransmitters • Sudden rise in calcium in the axon terminal of one neuron • Calcium stimulates synaptic vesicles to merge with the presynaptic me ...
... – A synapse is a region where neurons nearly touch – Small gap between neurons is the synaptic cleft – Transmission across a synapse is carried out by neurotransmitters • Sudden rise in calcium in the axon terminal of one neuron • Calcium stimulates synaptic vesicles to merge with the presynaptic me ...
Sound waves enter through the: Aurical (pinna) To the External
... Vibrates the Endolymph of Cochlear Duct Which Vibrates the Basilar Membrane Moving the hair cells of the Organ of Corti (spiral organ) against the Tectorial Membrane The Stimulated hair cells synapse with sensory neurons in the Spiral Ganglion Sending an action potential along these Travels in the v ...
... Vibrates the Endolymph of Cochlear Duct Which Vibrates the Basilar Membrane Moving the hair cells of the Organ of Corti (spiral organ) against the Tectorial Membrane The Stimulated hair cells synapse with sensory neurons in the Spiral Ganglion Sending an action potential along these Travels in the v ...
Principles of Biology ______Lake Tahoe
... a. activates a signal transduction pathway involving a second messenger in postsynaptic cell b. slower onset but last longer 2. eg. when norepinephrine binds to its receptor, a G protein is activated, which ultimately opens many channels (review ch. 11) D. Neurotransmitters - each bind to own recept ...
... a. activates a signal transduction pathway involving a second messenger in postsynaptic cell b. slower onset but last longer 2. eg. when norepinephrine binds to its receptor, a G protein is activated, which ultimately opens many channels (review ch. 11) D. Neurotransmitters - each bind to own recept ...
chapt07_lecture
... C. Classification of Neurons and Nerves 1. Functional classification of neurons – based on direction impulses are conducted a. Sensory neurons: conduct impulses from sensory receptors to the CNS b. Motor neurons: conduct impulses from the CNS to target organs (muscles or glands) c. Association/inte ...
... C. Classification of Neurons and Nerves 1. Functional classification of neurons – based on direction impulses are conducted a. Sensory neurons: conduct impulses from sensory receptors to the CNS b. Motor neurons: conduct impulses from the CNS to target organs (muscles or glands) c. Association/inte ...
Part1
... CVt = -gCa m(V) (V-ECa) - gKn(V-EK) - gL(V-EL) + Iapp nt = (n(V) - n) / n(V) m(V) = .5(1+tanh((v-v1)/v2) n(V) = .5(1+tanh((v-v3)/v4) n(V) = 1/cosh((v-v3)/2v4) We will write this system as: V’ = f(V,n) + Iapp n’ = g(V,n) ...
... CVt = -gCa m(V) (V-ECa) - gKn(V-EK) - gL(V-EL) + Iapp nt = (n(V) - n) / n(V) m(V) = .5(1+tanh((v-v1)/v2) n(V) = .5(1+tanh((v-v3)/v4) n(V) = 1/cosh((v-v3)/2v4) We will write this system as: V’ = f(V,n) + Iapp n’ = g(V,n) ...
100 - Bloomfield Central School
... balance and muscle movements, such as when you are playing a sport of instrument. ...
... balance and muscle movements, such as when you are playing a sport of instrument. ...
Chapter 3: The Biological Bases of Behavior
... offspring where there is more parental investment “The effects of chronic social stress in juvenile hamsters makes sense because if they were permanently fearful of conspecifics, they would not be able to mate and have ...
... offspring where there is more parental investment “The effects of chronic social stress in juvenile hamsters makes sense because if they were permanently fearful of conspecifics, they would not be able to mate and have ...
End-plate potential
End plate potentials (EPPs) are the depolarizations of skeletal muscle fibers caused by neurotransmitters binding to the postsynaptic membrane in the neuromuscular junction. They are called ""end plates"" because the postsynaptic terminals of muscle fibers have a large, saucer-like appearance. When an action potential reaches the axon terminal of a motor neuron, vesicles carrying neurotransmitters (mostly acetylcholine) are exocytosed and the contents are released into the neuromuscular junction. These neurotransmitters bind to receptors on the postsynaptic membrane and lead to its depolarization. In the absence of an action potential, acetylcholine vesicles spontaneously leak into the neuromuscular junction and cause very small depolarizations in the postsynaptic membrane. This small response (~0.5mV) is called a miniature end plate potential (MEPP) and is generated by one acetylcholine-containing vesicle. It represents the smallest possible depolarization which can be induced in a muscle.