Resting Potential
... • Saltatory conduction – impulse jumps from 1 node of Ranvier to another; why? • Myelin covering – • channels - are located at nodes of Ranvier for ions to diffuse in & out • Myelinated axons (white matter) - ...
... • Saltatory conduction – impulse jumps from 1 node of Ranvier to another; why? • Myelin covering – • channels - are located at nodes of Ranvier for ions to diffuse in & out • Myelinated axons (white matter) - ...
Phases
... voltage-sensitive ion channels open and close in response to changes in the membrane voltage This changes the membrane's permeability to those ions.Second, this change in permeability changes in the equilibrium potential and, thus, the membrane voltage.Thus, the membrane potential affects the permea ...
... voltage-sensitive ion channels open and close in response to changes in the membrane voltage This changes the membrane's permeability to those ions.Second, this change in permeability changes in the equilibrium potential and, thus, the membrane voltage.Thus, the membrane potential affects the permea ...
Neuroanatomy PP - Rincon History Department
... Neural communication cont’d The neural membrane only allows certain ions through the membrane. Positively charged sodium and potassium ions and negatively charged chloride ions flow back and forth across the cell membrane, but they do not cross at the same rate. The difference in the flow leads to ...
... Neural communication cont’d The neural membrane only allows certain ions through the membrane. Positively charged sodium and potassium ions and negatively charged chloride ions flow back and forth across the cell membrane, but they do not cross at the same rate. The difference in the flow leads to ...
refractory period
... The threshold becomes essentially infinite in the millisecond or so just after the first AP (I.e. the second stimulus comes during the absolute refractory period. ...
... The threshold becomes essentially infinite in the millisecond or so just after the first AP (I.e. the second stimulus comes during the absolute refractory period. ...
nervous quiz RG
... Explain what the following neurotransmitters do in the nervous system: GABA, glutamate, serotonin, dopamine, … ...
... Explain what the following neurotransmitters do in the nervous system: GABA, glutamate, serotonin, dopamine, … ...
Nervous System Lecture Notes Page
... Action Potential: self-propagating reversal of charge across plasma membrane ...
... Action Potential: self-propagating reversal of charge across plasma membrane ...
Prac T12 - studylib.net
... messages to her brain? The separation of positive and negative charges by the cell membrane provides a resistance since it keeps the charges from diffusing to equilibrium; if the charges are able to move in response to voltage, that movement is called a(n) ...
... messages to her brain? The separation of positive and negative charges by the cell membrane provides a resistance since it keeps the charges from diffusing to equilibrium; if the charges are able to move in response to voltage, that movement is called a(n) ...
doc Behavioural_Neuroscience_Jan_11
... o the axon then divides into two branches o They detect touch, temperature changes, pain and other sensory events that affect the skin Interneurons link sensory and motor neurons. ...
... o the axon then divides into two branches o They detect touch, temperature changes, pain and other sensory events that affect the skin Interneurons link sensory and motor neurons. ...
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 ...
![[j26]Chapter 7#](http://s1.studyres.com/store/data/009746692_1-cea296eaa3596328a1d6ed73629d44e9-300x300.png)
[j26]Chapter 7#
... 6. Myelin sheaths around axons within the CNS are formed by a. Schwann cells b. microglia c. astrocytes d. oligodendrocytes 7. The most abundant supporting (glial) cell in the CNS, which forms end-feet around capillaries associated with the blood-brain barrier, is the a. astrocyte b. oligodendrocyte ...
... 6. Myelin sheaths around axons within the CNS are formed by a. Schwann cells b. microglia c. astrocytes d. oligodendrocytes 7. The most abundant supporting (glial) cell in the CNS, which forms end-feet around capillaries associated with the blood-brain barrier, is the a. astrocyte b. oligodendrocyte ...
1. What type of joint do the capitulum of the humerus
... 44. Which of the following statements regarding graded potentials (as compared to action potentials) is not true? a) they are produced by ligand or mechanically-gated channels b) arise only at the trigger zone of the axon hillock c) they last as long as the stimulus does (no refractory period) d) it ...
... 44. Which of the following statements regarding graded potentials (as compared to action potentials) is not true? a) they are produced by ligand or mechanically-gated channels b) arise only at the trigger zone of the axon hillock c) they last as long as the stimulus does (no refractory period) d) it ...
CHAPTER 5 SIGNALLING IN NEURONS
... There are many different molecules that can act as neurotransmitters. When small amounts of neurotransmitter are released, the resulting effect on the postsynaptic cell's membrane potential varies in proportion to the amount of neurotransmitter released, that is, the effect is graded. EPSPs. Some ne ...
... There are many different molecules that can act as neurotransmitters. When small amounts of neurotransmitter are released, the resulting effect on the postsynaptic cell's membrane potential varies in proportion to the amount of neurotransmitter released, that is, the effect is graded. EPSPs. Some ne ...
2/pg
... • Congenital endplate acetylcholine esterase deficiency – failure to produce functional AChE at neuromuscular junction – ACh released, but not broken down – So, one signal from motor neurons, but multiple muscle contractions ...
... • Congenital endplate acetylcholine esterase deficiency – failure to produce functional AChE at neuromuscular junction – ACh released, but not broken down – So, one signal from motor neurons, but multiple muscle contractions ...
Chapter 34
... Neurotransmitter: type of signaling molecule that is synthesized in neurons only Plasma membrane has many gated channels for calcium ions In between action potentials, more calcium ions outside than inside (gate are shut) ...
... Neurotransmitter: type of signaling molecule that is synthesized in neurons only Plasma membrane has many gated channels for calcium ions In between action potentials, more calcium ions outside than inside (gate are shut) ...
Nervous Systems
... conformational change in protein, reducing its affinity for Na+. The Na+ then diffuses out. ...
... conformational change in protein, reducing its affinity for Na+. The Na+ then diffuses out. ...
chapt12 neuron_lecture
... • Local disturbances in membrane potential – occur when neuron is stimulated by chemicals, light, heat or mechanical disturbance – depolarization decreases potential across cell membrane due to opening of gated Na+ channels • Na+ rushes in down concentration and electrical gradients • Na+ diffuses f ...
... • Local disturbances in membrane potential – occur when neuron is stimulated by chemicals, light, heat or mechanical disturbance – depolarization decreases potential across cell membrane due to opening of gated Na+ channels • Na+ rushes in down concentration and electrical gradients • Na+ diffuses f ...
Neural Transmission Project
... Directions: Come up with your OWN metaphor that adequately describes the process involved in neural transmission. You must include the following concepts: depolarization, all-or-none principle, direction of impulse, refractory period, threshold, resting potential, and action potential. Additionally, ...
... Directions: Come up with your OWN metaphor that adequately describes the process involved in neural transmission. You must include the following concepts: depolarization, all-or-none principle, direction of impulse, refractory period, threshold, resting potential, and action potential. Additionally, ...
THE NERVOUS SYSTEM - Fox Valley Lutheran High School
... The strength of an impulse is always the same. ...
... The strength of an impulse is always the same. ...
Introduction to the Nervous System Guided Notes are masses of
... (1) ________________ motor neurons – innervate skeletal muscle (conscious control – Somatic Nervous System) (2) _____________ motor neurons – innervate all peripheral effectors except muscle (Autonomic Nervous System) (3) ______________________ - Most located in brain and spinal cord. These are resp ...
... (1) ________________ motor neurons – innervate skeletal muscle (conscious control – Somatic Nervous System) (2) _____________ motor neurons – innervate all peripheral effectors except muscle (Autonomic Nervous System) (3) ______________________ - Most located in brain and spinal cord. These are resp ...
Synaptic transmission
... almost all the synapses un CNS are chemical synapses, so these are discussed in detail. • In these, the first neuron secretes at its nerve ending synapse a chemical substance called a neurotransmitter (or often called simply transmitter substance), and this transmitter in turn acts on receptor prote ...
... almost all the synapses un CNS are chemical synapses, so these are discussed in detail. • In these, the first neuron secretes at its nerve ending synapse a chemical substance called a neurotransmitter (or often called simply transmitter substance), and this transmitter in turn acts on receptor prote ...
Chapter 11: Fundamentals of the Nervous System and Nervous Tissue
... ______6. A major subdivision of the nervous system that serves as the communication lines, linking all parts of the body to the CNS. 3. This exercise emphasizes the difference between neurons and neuroglia. Indicate which cell type is identified by the following descriptions. A. Neurons B. Neuroglia ...
... ______6. A major subdivision of the nervous system that serves as the communication lines, linking all parts of the body to the CNS. 3. This exercise emphasizes the difference between neurons and neuroglia. Indicate which cell type is identified by the following descriptions. A. Neurons B. Neuroglia ...
ppt
... • that are abrupt, pulse-like changes in the membrane potential that last a few ten thousandths of a second. • Action potentials can be divided into three phases: the resting or polarized state, depolarization, and repolarization • The amplitude of an action potential is nearly constant and is not r ...
... • that are abrupt, pulse-like changes in the membrane potential that last a few ten thousandths of a second. • Action potentials can be divided into three phases: the resting or polarized state, depolarization, and repolarization • The amplitude of an action potential is nearly constant and is not r ...
Physiology Ch 45 p543-557 [4-25
... neuropeptides are most often for prolonged signals Small-Molecule, Rapid Acting Transmitters – most often synthesized in cytosol and absorbed by active transport into vesicles at terminal. After depolarization, few vesicles are released into cleft within 1ms; neurotransmitter acts on postsynaptic ne ...
... neuropeptides are most often for prolonged signals Small-Molecule, Rapid Acting Transmitters – most often synthesized in cytosol and absorbed by active transport into vesicles at terminal. After depolarization, few vesicles are released into cleft within 1ms; neurotransmitter acts on postsynaptic ne ...
Peripheral nervous system
... nervous system, other has cell body in autonomic ganglion) • Preganglionic neuron - 1st neuron, releases Ach at synapse • Postganglionic neuron - releases Ach in parasympathetic division, norepinephrine in sympathetic division • Sympathetic division - stimulates the adrenal gland to ...
... nervous system, other has cell body in autonomic ganglion) • Preganglionic neuron - 1st neuron, releases Ach at synapse • Postganglionic neuron - releases Ach in parasympathetic division, norepinephrine in sympathetic division • Sympathetic division - stimulates the adrenal gland to ...
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.