1. Somatic nervous system
... • – if the membrane voltage becomes less negative than the resting potential, changing from -70 mV to -50 mV, then the voltage-gated sodium channels in the neuron’s plasma membrane will open – the voltage at which the voltage-gated channels open is called the threshold potential – when these channe ...
... • – if the membrane voltage becomes less negative than the resting potential, changing from -70 mV to -50 mV, then the voltage-gated sodium channels in the neuron’s plasma membrane will open – the voltage at which the voltage-gated channels open is called the threshold potential – when these channe ...
MyersExpPsych7e_IM_Module 03 garber edited
... – Controls protein manufacturing – Directs metabolism – No role in neural signaling ...
... – Controls protein manufacturing – Directs metabolism – No role in neural signaling ...
FIGURE LEGENDS FIGURE 3.1 Typical morphology of projection
... segment that it myelinates. The broad stippled region is compact myelin surrounded by cytoplasmic channels that remain open even after compact myelin has formed, allowing an exchange of materials among the myelin sheath, the Schwann cell cytoplasm, and perhaps the axon as well. FIGURE 3.10 Astrocyte ...
... segment that it myelinates. The broad stippled region is compact myelin surrounded by cytoplasmic channels that remain open even after compact myelin has formed, allowing an exchange of materials among the myelin sheath, the Schwann cell cytoplasm, and perhaps the axon as well. FIGURE 3.10 Astrocyte ...
Chapter 3
... – surround cell bodies of PNS ganglia – provide structural support – regulate exchange of materials btwn neurons & ISF ...
... – surround cell bodies of PNS ganglia – provide structural support – regulate exchange of materials btwn neurons & ISF ...
neurons
... of its membrane and allowing positive ions to rush in. • The neuron then quickly pushes the positively charged ions back out again and closes that section of its membrane. • The neuron then opens the next section of its membrane and allows the positively charged ions to rush in, and quickly pushes t ...
... of its membrane and allowing positive ions to rush in. • The neuron then quickly pushes the positively charged ions back out again and closes that section of its membrane. • The neuron then opens the next section of its membrane and allows the positively charged ions to rush in, and quickly pushes t ...
Neuron - Schoolwires.net
... with the same intensity. A strong stimulus can trigger more neurons to fire, and to fire more often, but it does not affect the action potentials strength or speed. Intensity of an action potential remains the same throughout the length of the axon. **Toilet flushing example ...
... with the same intensity. A strong stimulus can trigger more neurons to fire, and to fire more often, but it does not affect the action potentials strength or speed. Intensity of an action potential remains the same throughout the length of the axon. **Toilet flushing example ...
intro to psych brain and behavior
... axon; carries messages Myelin sheath: fatty layer covering the axon that helps nerve impulses move faster ...
... axon; carries messages Myelin sheath: fatty layer covering the axon that helps nerve impulses move faster ...
Neuron Teacher Key 5-17-16
... 13. What is a synapse? Identify where synapse junctions may occur in the body. A synapse is the junction where a neuron communicates with another cell across a _______________________________________________________________________ ...
... 13. What is a synapse? Identify where synapse junctions may occur in the body. A synapse is the junction where a neuron communicates with another cell across a _______________________________________________________________________ ...
action potentials - Zanichelli online per la scuola
... Membrane potential is the electrical charge difference across the membrane. Resting potential is the steady state membrane potential of a neuron. Voltage (electric potential difference): force that causes charged particles to move between two points. The resting potential of an axon is –60 to –70 mi ...
... Membrane potential is the electrical charge difference across the membrane. Resting potential is the steady state membrane potential of a neuron. Voltage (electric potential difference): force that causes charged particles to move between two points. The resting potential of an axon is –60 to –70 mi ...
Central Nervous System (CNS): Basic Facts
... Central Nervous System (CNS): Basic Facts • Adult human brain is – 2% body weight – 20% resting oxygen – 15-20% blood flow ...
... Central Nervous System (CNS): Basic Facts • Adult human brain is – 2% body weight – 20% resting oxygen – 15-20% blood flow ...
File
... When you watch a scary movie, you may feel your heart racing, sweating, breathing getting heavier etc. These responses are all caused by the HORMONE named ADRENALINE. ADRENALINE is produced by the ADRENAL GLANDS which sit on top of your kidneys. This response is called “Fight or Flight”. *response ...
... When you watch a scary movie, you may feel your heart racing, sweating, breathing getting heavier etc. These responses are all caused by the HORMONE named ADRENALINE. ADRENALINE is produced by the ADRENAL GLANDS which sit on top of your kidneys. This response is called “Fight or Flight”. *response ...
nervous-system-terms
... are received and sent from nerve cell to nerve cell along a nerve and through the spinal cord to the brain. The control centre of the body. It is an organ in the skull made from nerve cells. It receives messages from all parts of the body and sends out messages in return. A long rod made of many ner ...
... are received and sent from nerve cell to nerve cell along a nerve and through the spinal cord to the brain. The control centre of the body. It is an organ in the skull made from nerve cells. It receives messages from all parts of the body and sends out messages in return. A long rod made of many ner ...
UNIT 3
... Neurons in the CNS are organized into different patterns called neuronal pools. Each pool differs from all others and has its own role in regulating homeostasis. A neuronal pool may contain thousands to millions of neurons. Neuronal pools are organized into circuits which can be simple series, diver ...
... Neurons in the CNS are organized into different patterns called neuronal pools. Each pool differs from all others and has its own role in regulating homeostasis. A neuronal pool may contain thousands to millions of neurons. Neuronal pools are organized into circuits which can be simple series, diver ...
Neurons and Functional Neuroanatomy
... length of the axon in one direction The action potential moves in one direction because the membrane is refractory (unable to respond) once the action potential has been initiated at any particular place on the membrane ...
... length of the axon in one direction The action potential moves in one direction because the membrane is refractory (unable to respond) once the action potential has been initiated at any particular place on the membrane ...
The Nervous System - FW Johnson Collegiate
... intensity, variation with respect to frequency does occur - a glass rod at 40˚C may cause a single neuron to reach threshold level while the same glass rod at 50˚C will cause 2 or more to fire. The greater the number of impulses, the greater the intensity of the response The Sequence of Events that ...
... intensity, variation with respect to frequency does occur - a glass rod at 40˚C may cause a single neuron to reach threshold level while the same glass rod at 50˚C will cause 2 or more to fire. The greater the number of impulses, the greater the intensity of the response The Sequence of Events that ...
Neural Tissue – Chapter 12
... Step One: Sodium ions enter the cell and are attracted to the negative charges along the inner surface of the membrane. The arrival of positive charges shifts the transmembrane potential toward 0 mV. This is called depolarization. Step Two: At the resting potential, sodium ions are drawn to the oute ...
... Step One: Sodium ions enter the cell and are attracted to the negative charges along the inner surface of the membrane. The arrival of positive charges shifts the transmembrane potential toward 0 mV. This is called depolarization. Step Two: At the resting potential, sodium ions are drawn to the oute ...
The Nervous System PowerPoint
... Structure — contain dendrites of sensory neurons and axons of motor neurons Functions — conduct impulses necessary for sensations and voluntary movements ...
... Structure — contain dendrites of sensory neurons and axons of motor neurons Functions — conduct impulses necessary for sensations and voluntary movements ...
1. Which of the following is the component of the limbic system that
... D) was activated by her self-regulating autonomic nervous system. E) was controlled by both her nervous system and impulses from her endocrine system. 33. A picture of a cat is briefly flashed in the left visual field and a picture of a mouse is briefly flashed in the right visual field of a split-b ...
... D) was activated by her self-regulating autonomic nervous system. E) was controlled by both her nervous system and impulses from her endocrine system. 33. A picture of a cat is briefly flashed in the left visual field and a picture of a mouse is briefly flashed in the right visual field of a split-b ...
HUMAN ANATOMY - WordPress.com
... Receive sensory input and carries toward cell body DENDRITIC SPINES - site of axon synapses ...
... Receive sensory input and carries toward cell body DENDRITIC SPINES - site of axon synapses ...
Slide ()
... rostral targets, including the eye muscles. Axons that arise from neurons at caudal levels of the thoracic spinal cord innervate ganglion neurons that project to more caudal targets, such as the blood vessels of the ear. These two classes of ganglion neurons are intermingled in the ganglion, which s ...
... rostral targets, including the eye muscles. Axons that arise from neurons at caudal levels of the thoracic spinal cord innervate ganglion neurons that project to more caudal targets, such as the blood vessels of the ear. These two classes of ganglion neurons are intermingled in the ganglion, which s ...
Nervous System study guide
... The three main parts are: the brain, spinal cord (medulla) and nerves (neurons). The brain (master control center) has three main parts: 1. Cerebrum: largest area. Controls thinking, memory, senses, and feelings 2. Cerebellum: under the back part of the cerebrum. Controls balance and movement. 3. Br ...
... The three main parts are: the brain, spinal cord (medulla) and nerves (neurons). The brain (master control center) has three main parts: 1. Cerebrum: largest area. Controls thinking, memory, senses, and feelings 2. Cerebellum: under the back part of the cerebrum. Controls balance and movement. 3. Br ...
Chapter Two Line Title Here and Chapter Title Here and Here
... 2. Neuroglia in the PNS include: a. Satellite cells are glial cells of the PNS whose function is largely unknown. They are found surrounding neuron cell bodies within ganglia. b. Schwann cells, or neurolemmocytes, are glial cells of the PNS that surround nerve fibers, forming the myelin sheath. B. ...
... 2. Neuroglia in the PNS include: a. Satellite cells are glial cells of the PNS whose function is largely unknown. They are found surrounding neuron cell bodies within ganglia. b. Schwann cells, or neurolemmocytes, are glial cells of the PNS that surround nerve fibers, forming the myelin sheath. B. ...
Axon
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An axon (from Greek ἄξων áxōn, axis), also known as a nerve fibre, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands. In certain sensory neurons (pseudounipolar neurons), such as those for touch and warmth, the electrical impulse travels along an axon from the periphery to the cell body, and from the cell body to the spinal cord along another branch of the same axon. Axon dysfunction causes many inherited and acquired neurological disorders which can affect both the peripheral and central neurons.An axon is one of two types of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites. Axons are distinguished from dendrites by several features, including shape (dendrites often taper while axons usually maintain a constant radius), length (dendrites are restricted to a small region around the cell body while axons can be much longer), and function (dendrites usually receive signals while axons usually transmit them). All of these rules have exceptions, however.Some types of neurons have no axon and transmit signals from their dendrites. No neuron ever has more than one axon; however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other. Most axons branch, in some cases very profusely.Axons make contact with other cells—usually other neurons but sometimes muscle or gland cells—at junctions called synapses. At a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap. Some synaptic junctions appear partway along an axon as it extends—these are called en passant (""in passing"") synapses. Other synapses appear as terminals at the ends of axonal branches. A single axon, with all its branches taken together, can innervate multiple parts of the brain and generate thousands of synaptic terminals.