Nervous System (1)
... the body, outside the CNS The PNS is made up of two subdivisions 1. Somatic Nervous System - Nerves that control voluntary muscles of the skeleton 2. Autonomic Nervous System - Nerves that control cardiac muscle, glands, peristalsis etc. (Considered to be an involuntary system) ...
... the body, outside the CNS The PNS is made up of two subdivisions 1. Somatic Nervous System - Nerves that control voluntary muscles of the skeleton 2. Autonomic Nervous System - Nerves that control cardiac muscle, glands, peristalsis etc. (Considered to be an involuntary system) ...
Organization of the Human Nervous System
... by chemical neurotransmitters. They are found in tiny sacs at the end of the axon. After carrying the impulse across the synapse, the neurotransmitter must be removed or the synapse would continue to fire. Different neurotransmitters produce different effects. ...
... by chemical neurotransmitters. They are found in tiny sacs at the end of the axon. After carrying the impulse across the synapse, the neurotransmitter must be removed or the synapse would continue to fire. Different neurotransmitters produce different effects. ...
Function
... Myelin is a complex of lipids and protein. • Ranvier node: narrow part, no myelin-sheath • internode: the segment of NF between two Ranvier nodes, 0.3-1.5 mm, represent a single Schwann cell ...
... Myelin is a complex of lipids and protein. • Ranvier node: narrow part, no myelin-sheath • internode: the segment of NF between two Ranvier nodes, 0.3-1.5 mm, represent a single Schwann cell ...
Chapter 12 - Neural Tissue
... Cell body or Soma with Perikaryon Dendrites Axon with axon hillock Synaptic terminals Typical structure: ...
... Cell body or Soma with Perikaryon Dendrites Axon with axon hillock Synaptic terminals Typical structure: ...
Nervous System
... from the axon of one neuron to the dendrite of another is a microscopic space called a synapse. Myelinated nerves have a faster signal than nonmyelinated ...
... from the axon of one neuron to the dendrite of another is a microscopic space called a synapse. Myelinated nerves have a faster signal than nonmyelinated ...
6.5 Neurons and Synapses - Mr Cartlidge`s Saigon Science Blog
... The myelination of nerve fibres allows for saltatory conduction. Neurons pump sodium and potassium ions across their membranes to generate a resting potential. An action potential consists of depolarization and repolarization of the neuron. Nerve impulses are action potentials propagated along the a ...
... The myelination of nerve fibres allows for saltatory conduction. Neurons pump sodium and potassium ions across their membranes to generate a resting potential. An action potential consists of depolarization and repolarization of the neuron. Nerve impulses are action potentials propagated along the a ...
sistem saraf (nervous system)
... bodies and their dendrites. Clusters of gray matter located deeper in the brain are called ‘nuclei’. • In the Peripheral Nervous System (PNS) a cluster of neuron cell bodies – ‘ganglion’ (a swelling or knot). • Bundles of paralled axons with their myeline sheaths are whitish in colour – white matter ...
... bodies and their dendrites. Clusters of gray matter located deeper in the brain are called ‘nuclei’. • In the Peripheral Nervous System (PNS) a cluster of neuron cell bodies – ‘ganglion’ (a swelling or knot). • Bundles of paralled axons with their myeline sheaths are whitish in colour – white matter ...
Nervous System
... • Used for insulation and to help speed up the nerve impulse • Wraps around the axon of some neurons ...
... • Used for insulation and to help speed up the nerve impulse • Wraps around the axon of some neurons ...
Brain & Behavior
... recharge, so to speak • K(+) pumped out of cell, (-) charge restored • Refractory period – neuron cannot fire again during this process ...
... recharge, so to speak • K(+) pumped out of cell, (-) charge restored • Refractory period – neuron cannot fire again during this process ...
The Nervous System
... Bridging the Gap The axon ends with many small swellings called axon terminals. The small gap or space between the axon of one neuron and the dendrites or cell body of the next neuron is called the synapse or synaptic gap. A nerve impulse cannot go backward across a synapse. ...
... Bridging the Gap The axon ends with many small swellings called axon terminals. The small gap or space between the axon of one neuron and the dendrites or cell body of the next neuron is called the synapse or synaptic gap. A nerve impulse cannot go backward across a synapse. ...
Chapter 10
... Surrounding larger axons and dendrites of peripheral nerves are sheaths of neuroglial cells called Schwann cells. These cells are wound tightly around the fibers and, as a result, the cell membranes are layered closely together with little or no cytoplasm between them. The layers are composed of a ...
... Surrounding larger axons and dendrites of peripheral nerves are sheaths of neuroglial cells called Schwann cells. These cells are wound tightly around the fibers and, as a result, the cell membranes are layered closely together with little or no cytoplasm between them. The layers are composed of a ...
B) Nervous System Introduction NtG Spring
... Each neuron has only ____________________ axon Conducting region of the neuron _____________________________ nerve impulses Transmits impulses _________________ from the cell body Initial region of the axon arises from the ________________ ____________________ Narrows to form a slender p ...
... Each neuron has only ____________________ axon Conducting region of the neuron _____________________________ nerve impulses Transmits impulses _________________ from the cell body Initial region of the axon arises from the ________________ ____________________ Narrows to form a slender p ...
Nervous system
... messages to the brain), others are descending (carrying messages from the brain). The spinal cord is also involved in reflexes that do not immediately involve the brain. ...
... messages to the brain), others are descending (carrying messages from the brain). The spinal cord is also involved in reflexes that do not immediately involve the brain. ...
Nervous System - Downey Unified School District
... • PEPTIDE NEUROTRANSMITTERS ARE SYNTHESIZED IN THE ROUGH ENDOPLASMIC RETICULUM • THEY TRAVEL DOWN THE AXON TO THE NERVE TERMINAL • OTHER NEUROTRANSMITTERS ARE SYNTHESIZED IN THE CYTOPLASM OF THE NERVE TERMINALS AND ARE STORED IN VESICLES • WHEN AN ACTION POTENTIAL PASSES ALONG THE MEMBRANE OF A SYNA ...
... • PEPTIDE NEUROTRANSMITTERS ARE SYNTHESIZED IN THE ROUGH ENDOPLASMIC RETICULUM • THEY TRAVEL DOWN THE AXON TO THE NERVE TERMINAL • OTHER NEUROTRANSMITTERS ARE SYNTHESIZED IN THE CYTOPLASM OF THE NERVE TERMINALS AND ARE STORED IN VESICLES • WHEN AN ACTION POTENTIAL PASSES ALONG THE MEMBRANE OF A SYNA ...
Nervous System Basics: Neurons
... C. Transmitting the Impulse 1. When a stimulus excites an neuron, gates in the axon membrane open and let Na+ move in. a. This causes the inside to change to a slightly ...
... C. Transmitting the Impulse 1. When a stimulus excites an neuron, gates in the axon membrane open and let Na+ move in. a. This causes the inside to change to a slightly ...
Nervous System Neuron: nerve cell, functional unit of nervous
... -bundles 1000000 neurons grouped into different tracts -associate with different brain and body parts 100-1000 neurons can transfer one signal. ...
... -bundles 1000000 neurons grouped into different tracts -associate with different brain and body parts 100-1000 neurons can transfer one signal. ...
The Nervous System
... Serotonin – affects mood, sleep, sensory perception, and other functions, may play a role in psychological disorders like depression Acetylcholine – involved in memory, muscle action, sleep, emotions, those w/ Alzheimer’s have lower levels Dopamine – affects movement, attention, memory, learni ...
... Serotonin – affects mood, sleep, sensory perception, and other functions, may play a role in psychological disorders like depression Acetylcholine – involved in memory, muscle action, sleep, emotions, those w/ Alzheimer’s have lower levels Dopamine – affects movement, attention, memory, learni ...
11: Fundamentals of the Nervous System and Nervous Tissue
... A. The nervous system originates from a dorsal neural tube and neural crest, which begin as a layer of neuroepithelial cells that ultimately become the CNS (p. 423). B. Differentiation of neuroepithelial cells occurs largely in the second month of development (p. 423). C. Growth of an axon toward it ...
... A. The nervous system originates from a dorsal neural tube and neural crest, which begin as a layer of neuroepithelial cells that ultimately become the CNS (p. 423). B. Differentiation of neuroepithelial cells occurs largely in the second month of development (p. 423). C. Growth of an axon toward it ...
Central nervous system
... the neuron after sodium ions rush in • Sodium and potassium are actively transported back to their original positions = repolarization • Membrane is at rest again Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings ...
... the neuron after sodium ions rush in • Sodium and potassium are actively transported back to their original positions = repolarization • Membrane is at rest again Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings ...
48 - Groupfusion.net
... action potential, a period in which another another action potential can’t be activated S Action potentials are ...
... action potential, a period in which another another action potential can’t be activated S Action potentials are ...
Nervous System - University of Nevada, Las Vegas
... Contains the nucleus and a nucleolus Is the major biosynthetic center Is the focal point for the outgrowth of neuronal processes Has no centrioles (hence its amitotic nature) Has well-developed Nissl bodies (rough ER) Contains an axon hillock – cone-shaped area from which axons arise ...
... Contains the nucleus and a nucleolus Is the major biosynthetic center Is the focal point for the outgrowth of neuronal processes Has no centrioles (hence its amitotic nature) Has well-developed Nissl bodies (rough ER) Contains an axon hillock – cone-shaped area from which axons arise ...
7-Nerves - bloodhounds Incorporated
... regulating neurotransmitter release from sympathetic nerves and from adrenergic neurons in the central nervous system ...
... regulating neurotransmitter release from sympathetic nerves and from adrenergic neurons in the central nervous system ...
Bio70 Psychobiology Fall 2006 First Midterm October 12 Version A
... c. Its surface may be lined with synaptic receptors. d. It receives information from other neurons or the environment. ...
... c. Its surface may be lined with synaptic receptors. d. It receives information from other neurons or the environment. ...
Membrane potential
... channels in the membrane to open • As a result of ion flow through these channels, the inside of neuron briefly ...
... channels in the membrane to open • As a result of ion flow through these channels, the inside of neuron briefly ...
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.