file - Athens Academy
... allow the current to flow easily between the extracellular fluid and the axon. allow action potentials to develop. allow for saltatory conduction of the action potential. All of these are true of nodes of Ranvier. ...
... allow the current to flow easily between the extracellular fluid and the axon. allow action potentials to develop. allow for saltatory conduction of the action potential. All of these are true of nodes of Ranvier. ...
File
... messages from other neurons. Axon: Long single extension of a neuron, covered with myelin [MY-uh-lin] sheath to insulate and speed up messages through neurons. Terminal Branches of axon: Branched endings of an axon that transmit messages to other neurons. ...
... messages from other neurons. Axon: Long single extension of a neuron, covered with myelin [MY-uh-lin] sheath to insulate and speed up messages through neurons. Terminal Branches of axon: Branched endings of an axon that transmit messages to other neurons. ...
Nervous System Notes Outline
... 1. What are the 3 main functions of the nervous system? __________________ function – sensing __________________ function – connecting sensory __________ to movement __________________ function – moving 2. What are the 2 major divisions of the nervous system? __________________ Nervous System _ ...
... 1. What are the 3 main functions of the nervous system? __________________ function – sensing __________________ function – connecting sensory __________ to movement __________________ function – moving 2. What are the 2 major divisions of the nervous system? __________________ Nervous System _ ...
2-3 nervous sys Sp13
... Separates the circulating blood from the brain CSF Tight junctions around the capillaries restrict the entry of bacteria and large molecules into the cerebrospinal fluid ...
... Separates the circulating blood from the brain CSF Tight junctions around the capillaries restrict the entry of bacteria and large molecules into the cerebrospinal fluid ...
Neurons - MrsMcFadin
... 1. Sensory neurons = carry impulses from sense organs (eyes and ears) to spinal cord and brain. 2. Motor neurons = carry impulses from brain and the spinal cord to muscles and glands. 3. Interneurons = process information from sensory neurons and then send commands to motor neurons. ...
... 1. Sensory neurons = carry impulses from sense organs (eyes and ears) to spinal cord and brain. 2. Motor neurons = carry impulses from brain and the spinal cord to muscles and glands. 3. Interneurons = process information from sensory neurons and then send commands to motor neurons. ...
Chapter 7 Part 1 Nervous Tissue
... • Rare branches, if present, are called axon collaterals • Axonal terminal – branched terminus of an axon ...
... • Rare branches, if present, are called axon collaterals • Axonal terminal – branched terminus of an axon ...
Bite Me!
... and a muscle cell • Neurotransmitters from the axon send signals to the muscle • Synapses can form between two neurons, or between a neuron and another type of cell ...
... and a muscle cell • Neurotransmitters from the axon send signals to the muscle • Synapses can form between two neurons, or between a neuron and another type of cell ...
Exam 3 Review KEY
... 6) The smaller / bigger the size of the nerve fiber, the slower / faster the speed of nerve impulse. And the less / more myelin, which means larger diameter of the nerve fiber, the greater the speed. 7) Bundles of afferent and efferent neurons outside the CNS but inside the PNS are referred to as ne ...
... 6) The smaller / bigger the size of the nerve fiber, the slower / faster the speed of nerve impulse. And the less / more myelin, which means larger diameter of the nerve fiber, the greater the speed. 7) Bundles of afferent and efferent neurons outside the CNS but inside the PNS are referred to as ne ...
Introduction to Anatomy
... Myelination 1. PNS = neurolemmocytes CNS = oligodendrocytes 2. process 3. myelin sheath 4. neurolemma 5. nodes of Ranvier ...
... Myelination 1. PNS = neurolemmocytes CNS = oligodendrocytes 2. process 3. myelin sheath 4. neurolemma 5. nodes of Ranvier ...
Nervous System
... 1. The diagram below is of a nerve cell or neuron. i. Add the following labels to the diagram. Axon; Myelin sheath; Cell body; Dendrites; Muscle fibers; ii. If you like, colour in the diagram as suggested below. Axon - purple; Myelin sheath - yellow; Cell body - blue; ...
... 1. The diagram below is of a nerve cell or neuron. i. Add the following labels to the diagram. Axon; Myelin sheath; Cell body; Dendrites; Muscle fibers; ii. If you like, colour in the diagram as suggested below. Axon - purple; Myelin sheath - yellow; Cell body - blue; ...
Nervous-histology
... quantity and distribution of Nissl bodies. B: When the fiber is injured, the neuronal nucleus moves to the cell periphery, and Nissl bodies become greatly reduced in number. The nerve fiber distal to the injury degenerates along with its myelin sheath. Debris is phagocytosed by macrophages. ...
... quantity and distribution of Nissl bodies. B: When the fiber is injured, the neuronal nucleus moves to the cell periphery, and Nissl bodies become greatly reduced in number. The nerve fiber distal to the injury degenerates along with its myelin sheath. Debris is phagocytosed by macrophages. ...
supporting cells - Daniela Sartori
... at nodes – Current from AP at 1 node can depolarize next node to ...
... at nodes – Current from AP at 1 node can depolarize next node to ...
MODEL OF WHOLE NEURON
... body called a soma, a major fiber called an axon, and a system of branches called dendrites. • Axons, also called nerve fibers, convey electrical signals away from the soma and can be up to 1 m (3.3 ft) in length. Most axons are covered with a protective sheath of myelin, a substance made of fats an ...
... body called a soma, a major fiber called an axon, and a system of branches called dendrites. • Axons, also called nerve fibers, convey electrical signals away from the soma and can be up to 1 m (3.3 ft) in length. Most axons are covered with a protective sheath of myelin, a substance made of fats an ...
7. Describe what membrane potential is, and how
... action potential will be triggered • Voltage-gated ion channels these open and close in response to changes in membrane potential • Refractory period the period after the first action potential when the neuron is insensitive to a second depolarizing stimulus (limits action potential rate) ...
... action potential will be triggered • Voltage-gated ion channels these open and close in response to changes in membrane potential • Refractory period the period after the first action potential when the neuron is insensitive to a second depolarizing stimulus (limits action potential rate) ...
Nervous System
... Myelin sheath - A spiral membrane that surrounds the axon of some neurons. The membrane is composed of fatty (lipoprotein) membranes. There is an analogy with the insulation of electrical wires. In the PNS This sheath is produced by glial cells called Schwann cells. Neurons whose axons are myelinate ...
... Myelin sheath - A spiral membrane that surrounds the axon of some neurons. The membrane is composed of fatty (lipoprotein) membranes. There is an analogy with the insulation of electrical wires. In the PNS This sheath is produced by glial cells called Schwann cells. Neurons whose axons are myelinate ...
Peripheral nervous system
... Action potential - nerve impulse once voltage-gated ion channels open • Voltage-gated ion channel - opens/closes depending on membrane potential • Na+ gates open first, before K+ gates • Na+ enters cell (depolarization) >> K+ exits cell (repolarization) >> possible undershoot if K+ channels stay ope ...
... Action potential - nerve impulse once voltage-gated ion channels open • Voltage-gated ion channel - opens/closes depending on membrane potential • Na+ gates open first, before K+ gates • Na+ enters cell (depolarization) >> K+ exits cell (repolarization) >> possible undershoot if K+ channels stay ope ...
Neurons
... Neurotransmitters chemical messengers that traverse the synaptic gaps between neurons when released by the sending neuron, neurotransmitters travel across the synapse and bind to receptor sites on the receiving neuron, thereby influencing whether it will generate a neural impulse ...
... Neurotransmitters chemical messengers that traverse the synaptic gaps between neurons when released by the sending neuron, neurotransmitters travel across the synapse and bind to receptor sites on the receiving neuron, thereby influencing whether it will generate a neural impulse ...
LAB 10 NEURON and SPINAL CORD
... The glial cells are supporting cells, which are associated to the neurons and provide a supportive scaffolding for neurons ...
... The glial cells are supporting cells, which are associated to the neurons and provide a supportive scaffolding for neurons ...
What happens to the resting membrane potential of the membrane
... • Long appendages or processes: • Dendrites (receive info) • Axons (deliver info); some are covered by myelin ...
... • Long appendages or processes: • Dendrites (receive info) • Axons (deliver info); some are covered by myelin ...
Nervous System
... Potassium (K+) is high inside, sodium (Na+) is high outside cell K+ diffuses out readily through K+ channels, leaving a (-) charge inside Na+-K+ pump maintains by moving Na+ out and K+ in ...
... Potassium (K+) is high inside, sodium (Na+) is high outside cell K+ diffuses out readily through K+ channels, leaving a (-) charge inside Na+-K+ pump maintains by moving Na+ out and K+ in ...
Ch 35 PowerPoint - Damien Rutkoski
... When an action potential arrives at the end of an axon, the sacs release the neurotransmitters into the synapse between the two cells. Neurotransmitter molecules attach to receptors on the neighboring cell. This causes positive ions to rush across the cell membrane, stimulating the cell. If the sti ...
... When an action potential arrives at the end of an axon, the sacs release the neurotransmitters into the synapse between the two cells. Neurotransmitter molecules attach to receptors on the neighboring cell. This causes positive ions to rush across the cell membrane, stimulating the cell. If the sti ...
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.