The Nervous System
... • Sodium-potassium pumps in the nerve cell membrane pumps sodium (Na+) ions out of the cell and potassium (K+) ions into the cell by means of active transport. • As a result, the inside of the cell contains more K+ ions and fewer Na+ ions than the ...
... • Sodium-potassium pumps in the nerve cell membrane pumps sodium (Na+) ions out of the cell and potassium (K+) ions into the cell by means of active transport. • As a result, the inside of the cell contains more K+ ions and fewer Na+ ions than the ...
The Neuron
... Group of axons bundled together like electrical cable is called a nerve Myelin sheath Fatty covering that surrounds axon Not all axons are covered Provides insulation Improves efficiency Continues to be added until about 25 years Multiple Sclerosis: caused by myelin sheath degenerating ...
... Group of axons bundled together like electrical cable is called a nerve Myelin sheath Fatty covering that surrounds axon Not all axons are covered Provides insulation Improves efficiency Continues to be added until about 25 years Multiple Sclerosis: caused by myelin sheath degenerating ...
Nervous Sytem notes HS Spring
... consisting of the brain and spinal cord, and a peripheral nervous system (PNS), consisting of nerves carrying sensory and motor information between the CNS and muscles and glands. Both systems have two types of cells: neurons that transmit impulses and neuroglial cells that support neurons. 17-2 ...
... consisting of the brain and spinal cord, and a peripheral nervous system (PNS), consisting of nerves carrying sensory and motor information between the CNS and muscles and glands. Both systems have two types of cells: neurons that transmit impulses and neuroglial cells that support neurons. 17-2 ...
Parts of the Nerve Cell and Their Functions 1. Cell body
... through, thus connecting channels from one cell to the next, so that electrical changes in one cell are transmitted almost instantaneously to the next. Ions can generally flow both ways at these junctions i.e. they tend to be bi-directional, although there are electrical junctions where the ions can ...
... through, thus connecting channels from one cell to the next, so that electrical changes in one cell are transmitted almost instantaneously to the next. Ions can generally flow both ways at these junctions i.e. they tend to be bi-directional, although there are electrical junctions where the ions can ...
Unit A: Nervous and Endocrine Systems
... 1. Voltage-gated Na+ channels open and Na+ flows into the cell. • During cation (Na+) influx, membrane potential becomes less negative = Depolarization - decrease in negative charge along the membrane from -70mV to -55mV ...
... 1. Voltage-gated Na+ channels open and Na+ flows into the cell. • During cation (Na+) influx, membrane potential becomes less negative = Depolarization - decrease in negative charge along the membrane from -70mV to -55mV ...
Sharks are osmoregulators that maintain high internal salt
... Why is the synaptic cleft a very narrow space between synapsing neurons? a) Neurotransmitters are quickly degraded. b) Nerve impulses cannot travel very far. c) The ion channels on the post-synaptic cleft must be in direct contact with the presynaptic membrane. ...
... Why is the synaptic cleft a very narrow space between synapsing neurons? a) Neurotransmitters are quickly degraded. b) Nerve impulses cannot travel very far. c) The ion channels on the post-synaptic cleft must be in direct contact with the presynaptic membrane. ...
File - Biology with Radjewski
... – These concentration gradients will be used to generate the resting potential and changes in the resting potential – How does the resting potential change? ...
... – These concentration gradients will be used to generate the resting potential and changes in the resting potential – How does the resting potential change? ...
Action Potential Webquest
... If you have time at the end of the above sections, please watch the Crashcourse video on the Nervous System: https://www.youtube.com/watch?v=x4PPZCLnVkA. This video will help to tie everything up that you viewed in the previous sections. We will continue this discussion as we look more at action pot ...
... If you have time at the end of the above sections, please watch the Crashcourse video on the Nervous System: https://www.youtube.com/watch?v=x4PPZCLnVkA. This video will help to tie everything up that you viewed in the previous sections. We will continue this discussion as we look more at action pot ...
Chapter 11 Worksheet 2 The action potential: Fill in the blanks. The
... allows action potentials to travel up to 30 times faster in myelinated axons compared to naked axons. Using the textbook, describe what each of these diagrams is depicting: ...
... allows action potentials to travel up to 30 times faster in myelinated axons compared to naked axons. Using the textbook, describe what each of these diagrams is depicting: ...
Neurons
... • Axon conducts impulses away from the cell body Nodes of Ranvier Myelin sheath • Dendrites transmit impulses into the cell body ...
... • Axon conducts impulses away from the cell body Nodes of Ranvier Myelin sheath • Dendrites transmit impulses into the cell body ...
13.1- neurons
... and carry the nerve impulses toward the cell body. Cell bodies – contains the nucleus and all other typical cell organelles Axons – receive the nerve impulses from the cell bodies and carries them away towards other neurons or to effectors. ...
... and carry the nerve impulses toward the cell body. Cell bodies – contains the nucleus and all other typical cell organelles Axons – receive the nerve impulses from the cell bodies and carries them away towards other neurons or to effectors. ...
7. Describe what membrane potential is, and how
... 9. How do action potentials travel? Describe saltatory conduction. • Action potentials “travel” along an axon; it is regenerated at each position along the membrane • Neuron is stimulated at the dendrites or cell body • Saltatory conduction the action potential “jumps” the gaps in the myelin she ...
... 9. How do action potentials travel? Describe saltatory conduction. • Action potentials “travel” along an axon; it is regenerated at each position along the membrane • Neuron is stimulated at the dendrites or cell body • Saltatory conduction the action potential “jumps” the gaps in the myelin she ...
Nervous tissues (NS)
... Dendrites are shorter processes than axon in most neurons. They connect directly with the cell body. Dendrites are not myelinated. Schwan cells: (sometimes considered a kind of neuroglial cells) are found wrapped around the axons of myelinated neurons of the PNS. Schwan cells are required to produce ...
... Dendrites are shorter processes than axon in most neurons. They connect directly with the cell body. Dendrites are not myelinated. Schwan cells: (sometimes considered a kind of neuroglial cells) are found wrapped around the axons of myelinated neurons of the PNS. Schwan cells are required to produce ...
Chapter 12 – Introduction to the Nervous System
... • During the peak of an AP, the polarity reverses – Negative outside, positive inside – Causes impulse to travel from site of AP to adjacent plasma membrane – No fluctuation in AP due to “all or nothing” principle – AP cannot travel backwards on axon due to refractory periods ...
... • During the peak of an AP, the polarity reverses – Negative outside, positive inside – Causes impulse to travel from site of AP to adjacent plasma membrane – No fluctuation in AP due to “all or nothing” principle – AP cannot travel backwards on axon due to refractory periods ...
ADAM Nervous System Ion Channels Use this program only if you
... Use this program only if you need to review the differences between active and passive cell channels and voltage-gated and chemically-gated channels. Membrane Potential 1. What causes the outside surface of the cell membrane to be more positive? 2. The resting membrane potential in a neuron results ...
... Use this program only if you need to review the differences between active and passive cell channels and voltage-gated and chemically-gated channels. Membrane Potential 1. What causes the outside surface of the cell membrane to be more positive? 2. The resting membrane potential in a neuron results ...
Function
... cellular unit of nerve system Morphology of neuron: consists of cell body, dendrite and axon ---cell body: spherical, pyramidal fusiform or satellite in shape, 5um-150um, ---dendrite: arise from the cell body and branched like trees, usually shorter and thinker than axon ---axon: most neuron only ha ...
... cellular unit of nerve system Morphology of neuron: consists of cell body, dendrite and axon ---cell body: spherical, pyramidal fusiform or satellite in shape, 5um-150um, ---dendrite: arise from the cell body and branched like trees, usually shorter and thinker than axon ---axon: most neuron only ha ...
Obecná neuroanatomie
... • Are principal units of nervous tissue • Responsible for intake, workabout and transfer of signal • Composed of cell body (soma, perikaryon), dendrites (dendritum) and axon (axon) • Size of neurons vary in interval 5 µm (granular cells of cerebellum) to 150 µm (Purkynje cells of cerebellum) • After ...
... • Are principal units of nervous tissue • Responsible for intake, workabout and transfer of signal • Composed of cell body (soma, perikaryon), dendrites (dendritum) and axon (axon) • Size of neurons vary in interval 5 µm (granular cells of cerebellum) to 150 µm (Purkynje cells of cerebellum) • After ...
power point for chap 11
... • The threshold level is elevated, allowing strong stimuli to increase the frequency of action potential events ...
... • The threshold level is elevated, allowing strong stimuli to increase the frequency of action potential events ...
Biology 223 - Dr. Stuart Sumida
... • 2. Speeds up conduction of action potentials. • 3. Prevents “cross-talk” between different neurons grouped in a single nerve. (remember sensory and motor signals are traveling in different directions). ...
... • 2. Speeds up conduction of action potentials. • 3. Prevents “cross-talk” between different neurons grouped in a single nerve. (remember sensory and motor signals are traveling in different directions). ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.