test yourself
... Soft, white, fatty material that forms a sheath around the axons of most neurons. Bundle of axons in the peripheral nervous system. Also known as glial cells, cells that support and protect neurons in the central nervous system. Nerve cell. Chemical released by the axon of a neuron that travels acro ...
... Soft, white, fatty material that forms a sheath around the axons of most neurons. Bundle of axons in the peripheral nervous system. Also known as glial cells, cells that support and protect neurons in the central nervous system. Nerve cell. Chemical released by the axon of a neuron that travels acro ...
Unit 4 – Coordination Reflex Arc
... Occur in the Peripheral Nervous System • Schwann cells – form myelin sheath in PNS • Satellite cells – surround somas of neurons in ganglia ...
... Occur in the Peripheral Nervous System • Schwann cells – form myelin sheath in PNS • Satellite cells – surround somas of neurons in ganglia ...
neuron
... charge inside the cell that is different from the electrical charge outside the cell • This difference in electrical charge across a membrane is called a membrane potential • Membrane potentials are produced by the movement of ions across a cellular membrane ...
... charge inside the cell that is different from the electrical charge outside the cell • This difference in electrical charge across a membrane is called a membrane potential • Membrane potentials are produced by the movement of ions across a cellular membrane ...
Fundamentals of the Nervous System and Nervous Tissue
... Neurons (Nerve Cells) • Structural units of the nervous system – Composed of a body, axon, and dendrites – Long-lived, amitotic, and have a high metabolic ...
... Neurons (Nerve Cells) • Structural units of the nervous system – Composed of a body, axon, and dendrites – Long-lived, amitotic, and have a high metabolic ...
31.1 The Neuron
... The Nerve Impulse • A Stimulus is received from the external and internal environment. • If the stimulus is strong enough to overcome the threshold, sodium channels open at the beginning of the axon and the internal cell environment become positive. This sends the nerve impulse down the axon to the ...
... The Nerve Impulse • A Stimulus is received from the external and internal environment. • If the stimulus is strong enough to overcome the threshold, sodium channels open at the beginning of the axon and the internal cell environment become positive. This sends the nerve impulse down the axon to the ...
Chapter 14 - The Nervous System: Organization
... • Dendrites- receive input • Axon -conducts impulses away from the cell body • Axon Terminals - Neurotransmitters are manufactured in the cell body but released from axon terminals. The neurotransmitters stimulate other neurons. ...
... • Dendrites- receive input • Axon -conducts impulses away from the cell body • Axon Terminals - Neurotransmitters are manufactured in the cell body but released from axon terminals. The neurotransmitters stimulate other neurons. ...
HONORS BIOLOGY Chapter 28 Nervous Systems
... Motor neurons convey signals to effector cells (see figure 28.2) 28.2 Neurons are the functional units of nervous systems Neurons are ...
... Motor neurons convey signals to effector cells (see figure 28.2) 28.2 Neurons are the functional units of nervous systems Neurons are ...
nervous system 2012 - Junction Hill C
... to other cells by a fiber called an axon. Axons can be very short or quite long. You have some really long axons that extend almost 1 meter from your lower back to your toes ...
... to other cells by a fiber called an axon. Axons can be very short or quite long. You have some really long axons that extend almost 1 meter from your lower back to your toes ...
The Nervous System
... • Supporting cells (six types) – Glial cells/Schwann cells – Myelin sheaths (fast conduction of nerve impulses 150 m/s) – Nodes of ranvier ...
... • Supporting cells (six types) – Glial cells/Schwann cells – Myelin sheaths (fast conduction of nerve impulses 150 m/s) – Nodes of ranvier ...
Neurophysiology Complete
... Excitability: the ability to respond to stimuli and convert it to nerve impulses Conductivity: the ability to transmit the impulse to other neurons, muscles or glands In a resting neuron, the outside is more positive than the inside Resting membrane potential: the difference in electrical charges th ...
... Excitability: the ability to respond to stimuli and convert it to nerve impulses Conductivity: the ability to transmit the impulse to other neurons, muscles or glands In a resting neuron, the outside is more positive than the inside Resting membrane potential: the difference in electrical charges th ...
Check Yourself
... 2. Opiate-like substance found in the brain 4. Nervous system controlling heart, pupils of the eye, etc. 6. Chemical that affects a living organism 7. Powerful stimulant derived from a South American plant 10. An signal travels along the axon. 13. Drug that makes you drowsy, drunk, uncoordinated 14. ...
... 2. Opiate-like substance found in the brain 4. Nervous system controlling heart, pupils of the eye, etc. 6. Chemical that affects a living organism 7. Powerful stimulant derived from a South American plant 10. An signal travels along the axon. 13. Drug that makes you drowsy, drunk, uncoordinated 14. ...
Control_Systems11
... small space between the two neurons is called the Synaptic Cleft Neurotransmitters: chemical signals that transmit an impulse across the synapse to another cell ...
... small space between the two neurons is called the Synaptic Cleft Neurotransmitters: chemical signals that transmit an impulse across the synapse to another cell ...
nerve impulse
... Eventually, the impulse reaches the end of the axon. Neurons do not make direct contact with each other. The junction between the axon of one neuron and the dendrite of the next is called a synapse . ...
... Eventually, the impulse reaches the end of the axon. Neurons do not make direct contact with each other. The junction between the axon of one neuron and the dendrite of the next is called a synapse . ...
1
... Focal point for the outgrowth of neuronal processes Well developed nissil bodies (rough ER) Contains an Axon Hillock – cone shaped area from which axons arise ...
... Focal point for the outgrowth of neuronal processes Well developed nissil bodies (rough ER) Contains an Axon Hillock – cone shaped area from which axons arise ...
nervous system
... produce the fatty myelin sheath that envelops nerve fibers in the brain and spinal cord ...
... produce the fatty myelin sheath that envelops nerve fibers in the brain and spinal cord ...
How are axons guided to their targets?
... • Same guidance cues are used over and over for targeting axons • Guidance molecules are conserved in many organisms ...
... • Same guidance cues are used over and over for targeting axons • Guidance molecules are conserved in many organisms ...
Vocabulary: Chapter 1 Body Control Systems Neuron
... receptors to the CNS. Motor neuron- nerve cell in the peripheral nervous system that carries information from the CNS to the muscles and organs. Retina- an area at the back of the eye that contains sensory receptors for light. Dendrite- part of a neuron that collects information from other neurons. ...
... receptors to the CNS. Motor neuron- nerve cell in the peripheral nervous system that carries information from the CNS to the muscles and organs. Retina- an area at the back of the eye that contains sensory receptors for light. Dendrite- part of a neuron that collects information from other neurons. ...
PULSE LECTURE_Sept 21_Neurons
... • Serves as a barrier to enclose the cytoplasm inside the neuron, and keep unwanted substance out. • Contains receptors on the outer surface that bind neurotransmitters (lock and key mechanism). This allows for great specificity. • Contains ion channels that allow some ions to enter the cell while b ...
... • Serves as a barrier to enclose the cytoplasm inside the neuron, and keep unwanted substance out. • Contains receptors on the outer surface that bind neurotransmitters (lock and key mechanism). This allows for great specificity. • Contains ion channels that allow some ions to enter the cell while b ...
Nervous System Period 7 - Mercer Island School District
... A nerve impulse is an electrical signal that travels along an axon. When the nerve is activated, there is a sudden change in the voltage across the wall of the axon, caused by the movement of ions in and out of the neuron The speed of nerve impulses varies enormously in different types of neuron. Th ...
... A nerve impulse is an electrical signal that travels along an axon. When the nerve is activated, there is a sudden change in the voltage across the wall of the axon, caused by the movement of ions in and out of the neuron The speed of nerve impulses varies enormously in different types of neuron. Th ...
Nervous Tissue
... • Gray matter = nerve cell bodies, dendrites, axon terminals, bundles of unmyelinated axons and neuroglia (gray color) – In the spinal cord = gray matter forms an H-shaped inner core surrounded by white matter – In the brain = a thin outer shell of gray matter covers the surface & is found in cluste ...
... • Gray matter = nerve cell bodies, dendrites, axon terminals, bundles of unmyelinated axons and neuroglia (gray color) – In the spinal cord = gray matter forms an H-shaped inner core surrounded by white matter – In the brain = a thin outer shell of gray matter covers the surface & is found in cluste ...
Nervous System
... Dendrites—conduct impulses toward the cell body (receive information) Axons—conduct impulses away from the cell body Axons end in axon terminals Axonal terminals contain vesicles with neurotransmitters ...
... Dendrites—conduct impulses toward the cell body (receive information) Axons—conduct impulses away from the cell body Axons end in axon terminals Axonal terminals contain vesicles with neurotransmitters ...
Nervous System
... other organelles essential for the survival of the neuron. It is usually small compared to the rest of the neuron. 2. One or more dendrites extend from the cell body. The dendrites serve to receive incoming electrical signals from other neurons. 3. Most neurons have a single axon to transmit outgoin ...
... other organelles essential for the survival of the neuron. It is usually small compared to the rest of the neuron. 2. One or more dendrites extend from the cell body. The dendrites serve to receive incoming electrical signals from other neurons. 3. Most neurons have a single axon to transmit outgoin ...
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.