Lecture #19 - Suraj @ LUMS
... An action potential is a temporary reversal of the electrical. potential along the membrane for a few milliseconds. 1. Stimulus (pressure, chemical, electrical) alters shape of membrane carrier proteins. 2. Some Na + rushes in = depolarization. Inside of cell becomes locally + instead of –. 3. Local ...
... An action potential is a temporary reversal of the electrical. potential along the membrane for a few milliseconds. 1. Stimulus (pressure, chemical, electrical) alters shape of membrane carrier proteins. 2. Some Na + rushes in = depolarization. Inside of cell becomes locally + instead of –. 3. Local ...
Study/Review * Nervous System Part 2 * CNS and PNS
... 5. ___________________is a region between an axon terminal and a dendrite or cell body of another neuron 6. The name of an autoimmune demyelination disease characterized by antibodies to myelin is _________________________________ ...
... 5. ___________________is a region between an axon terminal and a dendrite or cell body of another neuron 6. The name of an autoimmune demyelination disease characterized by antibodies to myelin is _________________________________ ...
Nervous System Period 7 - Mercer Island School District
... Skeletal system: calcium from your bones helps the nervous system function Digestive system: ends messages to the muscles for eating and elimination of waste food Cardiovascular system: regulates the heart rate using baroreceptors ...
... Skeletal system: calcium from your bones helps the nervous system function Digestive system: ends messages to the muscles for eating and elimination of waste food Cardiovascular system: regulates the heart rate using baroreceptors ...
Mental activities
... ◦ Recalling information stored in long term memory may occur by associations with similar situations in the past ◦ 2 things influence if the info is available: 1. The strength of the information trace depending on the initial importance, number of times activated and how recently it occurred 2. Asso ...
... ◦ Recalling information stored in long term memory may occur by associations with similar situations in the past ◦ 2 things influence if the info is available: 1. The strength of the information trace depending on the initial importance, number of times activated and how recently it occurred 2. Asso ...
Lecture Slides - Austin Community College
... Membrane potential is the voltage difference across a membrane Resting potential (when the cell is not firing) is a 70mV difference between the inside and the outside - the membrane is polarized When gated ion channels open, ions diffuse across the membrane following their electrochemical gradients. ...
... Membrane potential is the voltage difference across a membrane Resting potential (when the cell is not firing) is a 70mV difference between the inside and the outside - the membrane is polarized When gated ion channels open, ions diffuse across the membrane following their electrochemical gradients. ...
Nervous System
... Sympathetic: most arise from the lower thoracic or lumbar region. Highly involved in the fight or flight reflex. Parasympathetic: Craniosacral; promotes all the internal responses we associated with a relaxed state. Commonalities: 1) they function automatically and usually involuntary, 2) they inner ...
... Sympathetic: most arise from the lower thoracic or lumbar region. Highly involved in the fight or flight reflex. Parasympathetic: Craniosacral; promotes all the internal responses we associated with a relaxed state. Commonalities: 1) they function automatically and usually involuntary, 2) they inner ...
File
... Ganglia (singular: Ganglion) -- a collection of neuron cell bodies within the Peripheral NS (eg. the Dorsal-Root Ganglion of sensory neuron cell bodies lies just outside the dorsal side of the spinal cord). -- a sensory neuron typically possesses very long dendrite(s) and a shorter than usual axon. ...
... Ganglia (singular: Ganglion) -- a collection of neuron cell bodies within the Peripheral NS (eg. the Dorsal-Root Ganglion of sensory neuron cell bodies lies just outside the dorsal side of the spinal cord). -- a sensory neuron typically possesses very long dendrite(s) and a shorter than usual axon. ...
NERVOUS SYSTEM - Welcome to SBI4U with Ms. Taman!
... • Distinguish among sensory, motor and interneuron with respect to structure and function • Contrast the locations and functions of the central and peripheral nervous systems • Differentiate between the functions of the sympathetic and parasympathetic divisions of the autonomic nervous system • Iden ...
... • Distinguish among sensory, motor and interneuron with respect to structure and function • Contrast the locations and functions of the central and peripheral nervous systems • Differentiate between the functions of the sympathetic and parasympathetic divisions of the autonomic nervous system • Iden ...
Resting Membrane Potential
... resting to firing? • The resting membrane potential of a neuron is -70 mV • In order for a neuron to fire a signal, the membrane potential must reach a certain threshold, around -55 mV. • This happens when another neuron stimulates it and allows a few Na+ channels to open and a few Na+ ions enter th ...
... resting to firing? • The resting membrane potential of a neuron is -70 mV • In order for a neuron to fire a signal, the membrane potential must reach a certain threshold, around -55 mV. • This happens when another neuron stimulates it and allows a few Na+ channels to open and a few Na+ ions enter th ...
ANPS 019 Beneyto-Santonja 10-31
... o Descending motor axons from cortex and red nucleus (in midbrain) o Ascending sensory axons from body AND face Cranial nerves – V, VI, VII, VIII Cerebellar Peduncles axons linking the cerebellum & brainstem Inferior Input (ICP) – unconscious proprioception info (what you are doing) o Info fro ...
... o Descending motor axons from cortex and red nucleus (in midbrain) o Ascending sensory axons from body AND face Cranial nerves – V, VI, VII, VIII Cerebellar Peduncles axons linking the cerebellum & brainstem Inferior Input (ICP) – unconscious proprioception info (what you are doing) o Info fro ...
Nervous System - Alamo Colleges
... Motor neuron – conducts impulses to effector Effector – muscle fiber or gland cell that responds to impulses ...
... Motor neuron – conducts impulses to effector Effector – muscle fiber or gland cell that responds to impulses ...
Slide 1
... • Neurotransmitters trigger GPs on new cell • Excitatory postsynaptic potential (EPSP) – Depolarizing, excitatory, promotes AP – Summation: multiple EPSPs = more depolarizing – Reach threshold depolarization AP will occur ...
... • Neurotransmitters trigger GPs on new cell • Excitatory postsynaptic potential (EPSP) – Depolarizing, excitatory, promotes AP – Summation: multiple EPSPs = more depolarizing – Reach threshold depolarization AP will occur ...
Slide 1
... Pathology of PNS Injury: Neuroapraxia (Class I) • Larger fibers are affected (e.g. efferent fibers to αMN). • Small sensory fibers are not affected • Clinical features – Marked reduction in muscle strength in a specific distribution distal to the lesion – Sensation may be similarly affected – Nerve ...
... Pathology of PNS Injury: Neuroapraxia (Class I) • Larger fibers are affected (e.g. efferent fibers to αMN). • Small sensory fibers are not affected • Clinical features – Marked reduction in muscle strength in a specific distribution distal to the lesion – Sensation may be similarly affected – Nerve ...
The master controlling and communicating system of the body Functions
... The potential difference (–70 mV) across the membrane of a resting neuron It is generated by different concentrations of Na+, K+, Cl, and protein anions (A) Ionic differences are the consequence of: o Differential permeability of the neurilemma to Na+ and K+ o Operation of the sodium-potassium pum ...
... The potential difference (–70 mV) across the membrane of a resting neuron It is generated by different concentrations of Na+, K+, Cl, and protein anions (A) Ionic differences are the consequence of: o Differential permeability of the neurilemma to Na+ and K+ o Operation of the sodium-potassium pum ...
Nervous System 4/28/09
... 1. Receiving info – inside and outside body 2. Responding to info – reaction to stimulus (change/signal) 3. Maintaining homeostasis ...
... 1. Receiving info – inside and outside body 2. Responding to info – reaction to stimulus (change/signal) 3. Maintaining homeostasis ...
5. Electrical Signals
... • Nervous system: (the network of nerve cells and fibers which transmits nerve impulses between parts of the body) • Neurons: (a specialized cell transmitting nerve impulses) • Nerve cells: (cell which is part of the nervous system, neuron) • Spinal cord: (the cylindrical bundle of nerve fibres whic ...
... • Nervous system: (the network of nerve cells and fibers which transmits nerve impulses between parts of the body) • Neurons: (a specialized cell transmitting nerve impulses) • Nerve cells: (cell which is part of the nervous system, neuron) • Spinal cord: (the cylindrical bundle of nerve fibres whic ...
SI October 7, 2008
... Describe the four basic characteristics of graded potentials. In what anatomical regions of the neuron are graded potentials typically generated? Typically generated in the soma and dendrites, which are rich in chemically gated ion channels that can be activated by synapses with other neurons. (from ...
... Describe the four basic characteristics of graded potentials. In what anatomical regions of the neuron are graded potentials typically generated? Typically generated in the soma and dendrites, which are rich in chemically gated ion channels that can be activated by synapses with other neurons. (from ...
What is the cause of the changes in membrane potential during an
... Components within the compound action potential • Refractory period/Faithfulness of conduction ...
... Components within the compound action potential • Refractory period/Faithfulness of conduction ...
Nerves Ganglia Spinal nerves Cranial nerves Afferent neurons
... Division of the ANS that regulates resting and nutrition-related functions such as digestion, defecation, and urination ...
... Division of the ANS that regulates resting and nutrition-related functions such as digestion, defecation, and urination ...
KUMC 31 Nasal Cavity Student
... Created by named muscle. Muscle extends from auditory tube cartilage to palatopharyngeus muscle. ...
... Created by named muscle. Muscle extends from auditory tube cartilage to palatopharyngeus muscle. ...
B Type
... B. Methylprednisolone is used during acute exacerbation C. The clinical improvement is not marked in patients treated with betainterferon D. ACTH is also used during acute exacerbation E. Beta-interferon is used in acute exacerbation ...
... B. Methylprednisolone is used during acute exacerbation C. The clinical improvement is not marked in patients treated with betainterferon D. ACTH is also used during acute exacerbation E. Beta-interferon is used in acute exacerbation ...
Lecture nerve
... 1. Leakage (non-gated) or Resting channels: are always open, contribute to the resting potential -nerve cells have more K+ than Na+ leakage channels -so K+ leak channels contribute more to resting membrane potential than Na+ leak channels -leaking ions are pumped back to where they belong 2. Gated c ...
... 1. Leakage (non-gated) or Resting channels: are always open, contribute to the resting potential -nerve cells have more K+ than Na+ leakage channels -so K+ leak channels contribute more to resting membrane potential than Na+ leak channels -leaking ions are pumped back to where they belong 2. Gated c ...
CLASS #1: 9 Jan 2001
... ● sodium-potassium pump (needs energy): pumps K+ in and Na+ out III. ACTION POTENTIAL: A rapid, all-or-none, reversible change in membrane potential of ~1msec duration (duration can vary) ● sequential opening , then closing of voltage-gated ion channels: 1st: Na+ chan. open (Na+ rushes in—causing de ...
... ● sodium-potassium pump (needs energy): pumps K+ in and Na+ out III. ACTION POTENTIAL: A rapid, all-or-none, reversible change in membrane potential of ~1msec duration (duration can vary) ● sequential opening , then closing of voltage-gated ion channels: 1st: Na+ chan. open (Na+ rushes in—causing de ...
Rheobase
Rheobase is a measure of membrane excitability. In neuroscience, rheobase is the minimal current amplitude of infinite duration (in a practical sense, about 300 milliseconds) that results in the depolarization threshold of the cell membranes being reached, such as an action potential or the contraction of a muscle. In Greek, the root ""rhe"" translates to current or flow, and ""basi"" means bottom or foundation: thus the rheobase is the minimum current that will produce an action potential or muscle contraction.Rheobase can be best understood in the context of the strength-duration relationship (Fig. 1). The ease with which a membrane can be stimulated depends on two variables: the strength of the stimulus, and the duration for which the stimulus is applied. These variables are inversely related: as the strength of the applied current increases, the time required to stimulate the membrane decreases (and vice versa) to maintain a constant effect. Mathematically, rheobase is equivalent to half the current that needs to be applied for the duration of chronaxie, which is a strength-duration time constant that corresponds to the duration of time that elicits a response when the nerve is stimulated at twice rheobasic strength.The strength-duration curve was first discovered by G. Weiss in 1901, but it was not until 1909 that Louis Lapicque coined the term ""rheobase"". Many studies are being conducted in relation to rheobase values and the dynamic changes throughout maturation and between different nerve fibers. In the past strength-duration curves and rheobase determinations were used to assess nerve injury; today, they play a role in clinical identification of many neurological pathologies, including as Diabetic neuropathy, CIDP, Machado-Joseph Disease, and ALS.