The Nervous System: Neural Tissue
... come down the axon – no matter how strong it is. 9. The __________________ __________________ __________________ is the time immediately after the Na gates close and repolarization is still occurring that a exceptionally strong stimulus may cause depolarization. F. Impulses 1. Impulses travel at dif ...
... come down the axon – no matter how strong it is. 9. The __________________ __________________ __________________ is the time immediately after the Na gates close and repolarization is still occurring that a exceptionally strong stimulus may cause depolarization. F. Impulses 1. Impulses travel at dif ...
The Nervous System
... • Membrane potentials arise from differences in ion concentrations between a cell’s contents and the extracellular fluid. • An action potential is an all-or-none change in the membrane potential. • Action potentials travel along an axon because they are self-propagating. • Chemical or electrical com ...
... • Membrane potentials arise from differences in ion concentrations between a cell’s contents and the extracellular fluid. • An action potential is an all-or-none change in the membrane potential. • Action potentials travel along an axon because they are self-propagating. • Chemical or electrical com ...
unit 2 – nervous system / senses - Greater Atlanta Christian Schools
... -“polarized” b/c of electrical charge difference that exists on each side of the cell membrane - inside cell: -ve ; high amt. of K+ - outside cell: +ve; high amt of Na+ - cell membrane permeability K+ > Na+ - Na+/ K+ exchange pump maintains RMP 3. Stimulated Neuron (action potential) a. nerve (e ...
... -“polarized” b/c of electrical charge difference that exists on each side of the cell membrane - inside cell: -ve ; high amt. of K+ - outside cell: +ve; high amt of Na+ - cell membrane permeability K+ > Na+ - Na+/ K+ exchange pump maintains RMP 3. Stimulated Neuron (action potential) a. nerve (e ...
Learning Objectives
... Know the main structures of neurons and the structural differences among neurons. ...
... Know the main structures of neurons and the structural differences among neurons. ...
The Nervous System: Neural Tissue
... a. Each neuron will have only one axon, however it may be branched. b. At the end of the axon will be axon terminal (AKA - synaptic knobs or synaptic boutons). c. Some axons will be covered by white, fatty insulation called a myelin sheath. Myelin sheaths increase the speed of impulse transmission. ...
... a. Each neuron will have only one axon, however it may be branched. b. At the end of the axon will be axon terminal (AKA - synaptic knobs or synaptic boutons). c. Some axons will be covered by white, fatty insulation called a myelin sheath. Myelin sheaths increase the speed of impulse transmission. ...
Jürgen R. Schwarz
... Information processing within the brain involves the generation of action potentials which are responsible for fast communication between nerve cells. Action potentials have a short duration and are generated by a transient influx of Na+ and a delayed outflow of K+ through voltage-gated ion channels ...
... Information processing within the brain involves the generation of action potentials which are responsible for fast communication between nerve cells. Action potentials have a short duration and are generated by a transient influx of Na+ and a delayed outflow of K+ through voltage-gated ion channels ...
touch and pain - Stark home page
... • Skin (glabrous, there is also hairy) • The different types of receptors • free nerve endings and encapsulated • Free nerve endings for pain, temperature and crude touch the axons are C fibers (unmyelinated) and A delta, also slow ...
... • Skin (glabrous, there is also hairy) • The different types of receptors • free nerve endings and encapsulated • Free nerve endings for pain, temperature and crude touch the axons are C fibers (unmyelinated) and A delta, also slow ...
Chapter 3 – The nerve cell Study Guide Describe an integrate
... Bernard J. Baars and Nicole M. Gage 2012 Academic Press ...
... Bernard J. Baars and Nicole M. Gage 2012 Academic Press ...
Lower Limb Nerve Injuries
... o Measures CAMP – compound action muscle potential, if halved patient has lost half of nerve fibres o Time to reach muscle o Amplitude reaching muscle o Nerve conduction velocity Conduction slowing along a whole nerve suggests demyelination i.e. Charcot-MarieTooth syndrome 2. Sensory nerve Conduct ...
... o Measures CAMP – compound action muscle potential, if halved patient has lost half of nerve fibres o Time to reach muscle o Amplitude reaching muscle o Nerve conduction velocity Conduction slowing along a whole nerve suggests demyelination i.e. Charcot-MarieTooth syndrome 2. Sensory nerve Conduct ...
Peripheral Nervous System (PNS)
... c. Adaptation i. Occurs when sensory receptors are subjected to an unchanging stimulus 1) Receptor membranes become less responsive 2) Receptor potentials decline in frequency or stop 3) Effect strong in pressure, touch, & smell receptors C. Structure of a Nerve 1. Nerve - cordlike organ of the PNS ...
... c. Adaptation i. Occurs when sensory receptors are subjected to an unchanging stimulus 1) Receptor membranes become less responsive 2) Receptor potentials decline in frequency or stop 3) Effect strong in pressure, touch, & smell receptors C. Structure of a Nerve 1. Nerve - cordlike organ of the PNS ...
Neurons, Synapses and Signaling
... Ca2+ to diffuse into the synaptic terminal, which forces vesicles to fuse with membrane causing the release of neurotransmitter into the synaptic cleft. Neurotransmitters diffuse across the cleft and binds to and activates a specific membrane receptor (called a ligand-gated ion channel). ...
... Ca2+ to diffuse into the synaptic terminal, which forces vesicles to fuse with membrane causing the release of neurotransmitter into the synaptic cleft. Neurotransmitters diffuse across the cleft and binds to and activates a specific membrane receptor (called a ligand-gated ion channel). ...
Peripheral Nervous System
... the outside under resting conditions due to distribution of ions controlled by Na+/K+ pump that require ATP • Nerve impulse starts when the membrane of the nerve depolarizes due to some stimulus, chemical, temp. changes, mechanical, etc…. • Depolarization is caused by the influx of Na+ which causes ...
... the outside under resting conditions due to distribution of ions controlled by Na+/K+ pump that require ATP • Nerve impulse starts when the membrane of the nerve depolarizes due to some stimulus, chemical, temp. changes, mechanical, etc…. • Depolarization is caused by the influx of Na+ which causes ...
I. Functions and Divisions of the Nervous System A. The nervous
... exceptionally high metabolic rate requiring oxygen and glucose. 2. The neuron cell body, also called the perikaryon or soma, is the major biosynthetic center containing the usual organelles except for centrioles. 3. Neurons have armlike processes that extend from the cell body. a. Dendrites are cell ...
... exceptionally high metabolic rate requiring oxygen and glucose. 2. The neuron cell body, also called the perikaryon or soma, is the major biosynthetic center containing the usual organelles except for centrioles. 3. Neurons have armlike processes that extend from the cell body. a. Dendrites are cell ...
2222222222222222222 System • Responsible for coordinating the
... o Axon: cytoplasmic tail that carries the nerve impulse to other nerves or effectors o Myelin sheath: fatty covering along the axon of a nerve and of Schwann cells ! ____________________________ ____________________ o Neurilemma: thin membrane ____________ _____________ of the peripheral nervous sys ...
... o Axon: cytoplasmic tail that carries the nerve impulse to other nerves or effectors o Myelin sheath: fatty covering along the axon of a nerve and of Schwann cells ! ____________________________ ____________________ o Neurilemma: thin membrane ____________ _____________ of the peripheral nervous sys ...
How the Nervous System Works
... The nervous system receives information about what is happening both inside and outside your body. It also directs the way in which your body responds to this information. In addition, the nervous system helps maintain homeostasis. A stimulus is any change or signal in the environment that can make ...
... The nervous system receives information about what is happening both inside and outside your body. It also directs the way in which your body responds to this information. In addition, the nervous system helps maintain homeostasis. A stimulus is any change or signal in the environment that can make ...
Biol 155 Human Physiology - University of British Columbia
... making the inside positive. The Na+ channels close at the same time the V-G K+ channels open. When this happens, there is a rush of K+ out of the cell, making the inside more negative. ...
... making the inside positive. The Na+ channels close at the same time the V-G K+ channels open. When this happens, there is a rush of K+ out of the cell, making the inside more negative. ...
Overview Functions of the Nervous System
... • travel across the synapse to the postsynaptic cells, where they are converted back into electrical signals • Axon terminal: contains many tiny, membrane-bounded sacs (synaptic vesicles) containing thousands of neurotransmitter molecules • Neurotransmitter receptor region on the membrane of a dendr ...
... • travel across the synapse to the postsynaptic cells, where they are converted back into electrical signals • Axon terminal: contains many tiny, membrane-bounded sacs (synaptic vesicles) containing thousands of neurotransmitter molecules • Neurotransmitter receptor region on the membrane of a dendr ...
Babylon university Medical physics exam
... inside go positive to 50 mV. The action potential last few m sec for most neuron and muscles, and last 150-300 m sec for cardiac muscle. The membrane of some axons is covered with fatty insulating layer called myelin has small uninsulated gaps called nodes of ranvier. The action potential decreases ...
... inside go positive to 50 mV. The action potential last few m sec for most neuron and muscles, and last 150-300 m sec for cardiac muscle. The membrane of some axons is covered with fatty insulating layer called myelin has small uninsulated gaps called nodes of ranvier. The action potential decreases ...
axonal terminals
... 1. Polarization of the neuron's membrane: Sodium is on the outside, and potassium is on the inside. • When a neuron is not stimulated — it's just sitting with no impulse to carry or transmit — its membrane is polarized. • Being polarized means that the electrical charge on the outside of the membran ...
... 1. Polarization of the neuron's membrane: Sodium is on the outside, and potassium is on the inside. • When a neuron is not stimulated — it's just sitting with no impulse to carry or transmit — its membrane is polarized. • Being polarized means that the electrical charge on the outside of the membran ...
Nervous System Chapter 11 Answers
... Chemical gradient is formed when ions diffuse across a membrane (High to low concentration) Electrical gradient is formed when ions move toward an area of opposite charge An electrochemical gradient occurs on neural membranes due to BOTH chemical & electrical gradients 11. What is the resting membra ...
... Chemical gradient is formed when ions diffuse across a membrane (High to low concentration) Electrical gradient is formed when ions move toward an area of opposite charge An electrochemical gradient occurs on neural membranes due to BOTH chemical & electrical gradients 11. What is the resting membra ...
In Pursuit of Ecstasy - Heartland Community College
... Neural Control and the Senses Chapter 25 ...
... Neural Control and the Senses Chapter 25 ...
NEUROPHYSIOLOGY
... Describe resting membrane potential. Explain how action potentials are generated ...
... Describe resting membrane potential. Explain how action potentials are generated ...
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.