• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
The Brain, the Nervous System, and Yoga
The Brain, the Nervous System, and Yoga

... mind. Another form of health in a person’s life is manifested through happiness. Health and happiness may be magnified by practicing the ancient art of yoga. No other practice has sustained the elements the ways in which yoga has, nor has any other natural practice been proven as effective in positi ...
lecture 36
lecture 36

...  Regeneration involves coordinated activity among:  Macrophages – remove debris  Schwann cells – form regeneration tube and secrete growth factors ...
Neuronal control of swimming in jellyfish: a
Neuronal control of swimming in jellyfish: a

... great a difference between the nervous system of the nakedeyed and covered-eyed Medusae, that simultaneous description of the nervous systems in both groups is not…practical”. This statement was made during his discussion of the histological results obtained by Hertwig and Hertwig (1878); however, R ...
Action Potentials
Action Potentials

... Bending of the hairs increases the frequency of action potentials in sensory neurons in direct proportion to the amount of rotational acceleration. ...
Isolated Ocular Motor Nerve Palsies
Isolated Ocular Motor Nerve Palsies

... the diplopia; whether there is any associated ptosis or facial muscle weakness; whether it is constant or intermittent; and whether there are any other localizing symptoms such as involvement of other cranial nerves, limb weakness, ataxia, proptosis, or impairment in visual acuity or color perceptio ...
approved
approved

... be responsible for all the following signs and symptoms EXCEPT A dry eye from loss of secretion of the lacrimal gland B loss of secretion of the parotid gland on one side C loss of secretion of the submandibular and sublingual glands on one side D dry nasal mucosa from loss of secretion of the nasal ...
different sensory modalities
different sensory modalities

... enhancement is present only if the visual and auditory stimuli fall in the visual and auditory receptive field of the multisensory neuron • the different unimodal receptive fields of a multisensory neuron overlap • it is in virtue of this overlap that stimuli located near one another in space enhanc ...
OCULOPLASTICS AND NEURO
OCULOPLASTICS AND NEURO

... morphologic sequela of disease - any disease - that causes damage to ganglion cells and axons of the optic nerve.” Walsh & Hoyt’s Clinical Neuro-Ophthalmology, 5th Edition ...
Chapter 11-自律神經及體運動神經系統檔案
Chapter 11-自律神經及體運動神經系統檔案

... Curare  Curare 劍毒 is an extract of a plant (Chondrodendron tomentosum) found in South America  When an animal was struck by a curare-laced arrow or dart, it would become paralyzed and eventually die from respiratory failure 呼吸衰竭  The effective component of curare is a compound called tubocurarin ...
Chapter 11-自律神經及體運動神經系統檔案
Chapter 11-自律神經及體運動神經系統檔案

...  Myasthenia gravis 重症肌無力 is a disease affecting transmission at neuromuscular junction  Because the muscles most frequently affected are those of the head, difficulties in speaking (dysarthria) 發音困難 and in swallowing (dysphagia) 吞嚥困難 are common symptoms; dropping of the eyelids (ptosis) 眼瞼下垂 is al ...
Lecture: Muscle Physiology
Lecture: Muscle Physiology

... adjacent sites d. Vo1tage-Dependent Na + Channels at the adjacent sites open, allowing more Na + in e. A wave of depolarization therefore spreads across the entire cell f. this cannot be stopped and is called an all-or-none response g. entire process occurs in about 1 millisecond (1/1000 second) h. ...
View/Open - Repository | UNHAS
View/Open - Repository | UNHAS

... To demonstrate selection criteria for cochlear implant candidates as well as the outcome of quality of life (QoL) after cochlear implant surgery. MATERIAL AND METHOD Retrospective review was performed of all cochlear implants at Wahidin Hospital. A total number of 5 cochlear implantations were perfo ...
Chapter 20 The Autonomic Nervous System
Chapter 20 The Autonomic Nervous System

... Terminal branches of autonomic fibers contain swellings, called varicosities ...
The Autonomic Nervous System
The Autonomic Nervous System

... signals away from the brain and spinal cord to theperipheral tissues, and the afferent division, the neurons of which bring information from the periphery to the CNS.Afferent neurons provide sensory input to modulate the function of the efferent division through reflex arcs, thatis, neural pathways ...
nervous system physiology 4
nervous system physiology 4

... interaction of the cross-bridges from the myosin filaments with the actin filaments), causing them to slide alongside each other, which is the contractile process. Energy (ATP) is needed for the contractile process to proceed. After a fraction of a second, Ca2+ are pumped back into SR by a Ca2+-memb ...
Recording Electrical Signals from Human Muscle
Recording Electrical Signals from Human Muscle

... the tendon-tap (stretch) reflex for the human quadriceps muscle. After witnessing recordings from about 200 student subjects, I have noted several interesting trends related to motor unit control and EMG activity. First, subjects with a history of athletic training are often more facile in isolating ...
Islamic University Nursing College Final Exam,summer Anatomy
Islamic University Nursing College Final Exam,summer Anatomy

... ( ) Gluteus maximus is used for injection. ( ) Osteoclasts are bone forming cells ( ) CSF is present in subdural space ( ) Mitotic division is characteristic of all layers of epidermis ( ) Sensory neurons convey information from CNS to the periphery ( ) The thalamus is a relay center for all sensory ...
The Senses
The Senses

... throughout time to help them find food. Dogs on the other hand, were not originally diurnal animals, until humans domesticated them. Consequently, the ability to see at night was originally more important to the dog than color. After all, their prey is often camouflaged with the surroundings, so the ...
Heading:	Sensory	Deprivation	in	Humans,	Mice,	and	History Caleb	B.	Carson  Running Head: Sensory Deprivation
Heading: Sensory Deprivation in Humans, Mice, and History Caleb B. Carson Running Head: Sensory Deprivation

... loss in primary somatosensory cortex, in control mice one month of age, that the number of spines eliminated over a two week period was significantly higher than the percentage formed. To determine the effects of the sensory deprivation on this spinal dendrite loss rate, mice from four weeks of a ...
A.L. Wafa`a sameer 2014 Nervous System/ Physiology Nervous system
A.L. Wafa`a sameer 2014 Nervous System/ Physiology Nervous system

... The ANS ( in association with the endocrine system ) is primarily responsible for maintaining a nearly constant internal environment of the body , regardless of the changes that take place in the external environment . This is done by regulation of the activities of smooth muscle , cardiac m. & cert ...
Categorical perception of somesthetic stimuli: psychophysical
Categorical perception of somesthetic stimuli: psychophysical

... detection theory (Green and Sweets, 1966), to determine whether they encode the categorization process. The results indicate that this is true. In addition, we observe that most of these categorical neurons are not associated with the motor responses used by the animal to indicate categorization. Fi ...
Responses to Odors Mapped in Snail Tentacle and Brain by [14C]
Responses to Odors Mapped in Snail Tentacle and Brain by [14C]

... cells (grain density at least 5 times background) in a sample of sections (Table I). The frequency of labeling was always greater in the exposed tentacle, as compared with the unexposed tentacle, but there were no significant differences between stimulus conditions. The absolute number of labeled se ...
Chapter 15: Sense Organs
Chapter 15: Sense Organs

... RETINAL IMAGE ...
Scale-Invariant Adaptation in Response to
Scale-Invariant Adaptation in Response to

... variance through receiver-operating characteristic (ROC) analysis of a neuron’s firing rate. We computed the probability distributions of firing rate for a single cell over the course of a 0.1 Hz switch by separating the time course into 500 ms bins, computing the firing rate during each bin over ea ...
Division of Informatics, University of Edinburgh
Division of Informatics, University of Edinburgh

... nonical neurons respond to different types of visual stimuli than mirror neurons. While canonical neurons discharge at the mere sight of an object, mirror neurons are triggered at the sight of hand or mouth interactions with objects. This uncovers the presence of an interesting visuomotor coupling m ...
< 1 ... 83 84 85 86 87 88 89 90 91 ... 293 >

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.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report