Neuron Labeling WS
... The long fiber that carries the nerve impulses. A bundle of axons. The connection between adjacent neurons. The chemical secreted into the gap between neurons at a synapse. A rapid automatic response to a stimulus. The covering of fatty material that speeds up the passage of nerve impulses. The stru ...
... The long fiber that carries the nerve impulses. A bundle of axons. The connection between adjacent neurons. The chemical secreted into the gap between neurons at a synapse. A rapid automatic response to a stimulus. The covering of fatty material that speeds up the passage of nerve impulses. The stru ...
A- A- A- K+ A - How Your Brain Works
... • In addition to the resting (K+ leakage) channels, neurons can have a large variety of gated ion channels which will open transiently in the presence of certain stimuli or chemical signals. These gated channels may be permeable to Na+, Cl- or Ca++. • When these gated channels open, the voltage acro ...
... • In addition to the resting (K+ leakage) channels, neurons can have a large variety of gated ion channels which will open transiently in the presence of certain stimuli or chemical signals. These gated channels may be permeable to Na+, Cl- or Ca++. • When these gated channels open, the voltage acro ...
Introduction_to_nerv..
... The Myelin Sheath • The myelinated sheath is made up of mainly the membranes of Schwann cells • These membranes contain phospholipid molecules that have long fatty acids. • These prevent the movement of charged water soluble ions ...
... The Myelin Sheath • The myelinated sheath is made up of mainly the membranes of Schwann cells • These membranes contain phospholipid molecules that have long fatty acids. • These prevent the movement of charged water soluble ions ...
MOAC Mini-projects
... fluorescently labeled proteins involved in cell motion, e.g. actin and myosin II. ...
... fluorescently labeled proteins involved in cell motion, e.g. actin and myosin II. ...
lecture notes #4 membrane potentials
... The average trunk contains about twice as many unmyelinated fibers as myelinated fibers Myelinated fibers o Central core is the axon o The axon is filled with axoplasm o The myelin sheath surrounds the axon o The sheaths are interrupted by areas with no myelin sheaths and they are called the nodes o ...
... The average trunk contains about twice as many unmyelinated fibers as myelinated fibers Myelinated fibers o Central core is the axon o The axon is filled with axoplasm o The myelin sheath surrounds the axon o The sheaths are interrupted by areas with no myelin sheaths and they are called the nodes o ...
Chapter 10
... 14. List the changes that occur during an action potential. When enough stimuli have accumulated to cause the threshold potential to be released, the area stimulated opens its sodium channels. As the sodium ions rush in, the inside of the cell becomes momentarily positive. At the same time, potassiu ...
... 14. List the changes that occur during an action potential. When enough stimuli have accumulated to cause the threshold potential to be released, the area stimulated opens its sodium channels. As the sodium ions rush in, the inside of the cell becomes momentarily positive. At the same time, potassiu ...
Chapter 10
... 15. Distinguish between action potentials and nerve impulses. An action potential occurs at a specific site. When an action potential occurs at the trigger zone of a nerve cell, it sends an electrical impulse to the adjacent membrane. This causes an action potential at the next site. This occurs in ...
... 15. Distinguish between action potentials and nerve impulses. An action potential occurs at a specific site. When an action potential occurs at the trigger zone of a nerve cell, it sends an electrical impulse to the adjacent membrane. This causes an action potential at the next site. This occurs in ...
Chapter 12
... • Glial cells are found in both CNS and PNS, but at least four types of glial cells are identified in CNS. • Astrocytes and the blood-brain barrier - they are the most abundant of the neuroglia in the CNS and could constitute up to 90% of the nervous tissue. • Astrocytes interact with neurons in two ...
... • Glial cells are found in both CNS and PNS, but at least four types of glial cells are identified in CNS. • Astrocytes and the blood-brain barrier - they are the most abundant of the neuroglia in the CNS and could constitute up to 90% of the nervous tissue. • Astrocytes interact with neurons in two ...
CHAPTER 12 AND 13 OUTLINE
... • • Repolarization is occurring • • The threshold level is elevated, allowing strong stimuli to increase the frequency of action potential events Conduction Velocities of Axons • • Conduction velocities vary widely among neurons • • Rate of impulse propagation is determined by: • • Axon diameter – t ...
... • • Repolarization is occurring • • The threshold level is elevated, allowing strong stimuli to increase the frequency of action potential events Conduction Velocities of Axons • • Conduction velocities vary widely among neurons • • Rate of impulse propagation is determined by: • • Axon diameter – t ...
The Nervous System
... the ripples created by a stone tossed into a pond). • As the Na+ drifts, some of it will leak back out of the membrane. – What this means is that the degree of depolarization caused by the graded potential decreases with distance from the origin. ...
... the ripples created by a stone tossed into a pond). • As the Na+ drifts, some of it will leak back out of the membrane. – What this means is that the degree of depolarization caused by the graded potential decreases with distance from the origin. ...
histology of nervous tissue
... Myelin – formation & function General structure of peripheral nerves Ganglia – dorsal root ganglia & autonomic ganglia ...
... Myelin – formation & function General structure of peripheral nerves Ganglia – dorsal root ganglia & autonomic ganglia ...
Worksheet - Nervous System I Lecture Notes Page
... must open then close in sequence along the entire length of the cell membrane. This results in a relative ________________ (slower/faster) rate of conduction. In contract, myelinated neurons are capable of ___________________________(continuous/saltatory) conduction. In this type of conduction only ...
... must open then close in sequence along the entire length of the cell membrane. This results in a relative ________________ (slower/faster) rate of conduction. In contract, myelinated neurons are capable of ___________________________(continuous/saltatory) conduction. In this type of conduction only ...
7. Nervous Tissue
... C. Synaptic vesicles release neurotransmitter into the synaptic cleft by exocytosis. In this process, the vesicle membrane is incorporated into the presynaptic membrane. Although these vesicles contain neurotransmitter, they do not manufacture it. ...
... C. Synaptic vesicles release neurotransmitter into the synaptic cleft by exocytosis. In this process, the vesicle membrane is incorporated into the presynaptic membrane. Although these vesicles contain neurotransmitter, they do not manufacture it. ...
The Nervous System
... the ripples created by a stone tossed into a pond). • As the Na+ drifts, some of it will leak back out of the membrane. – What this means is that the degree of depolarization caused by the graded potential decreases with distance from the origin. ...
... the ripples created by a stone tossed into a pond). • As the Na+ drifts, some of it will leak back out of the membrane. – What this means is that the degree of depolarization caused by the graded potential decreases with distance from the origin. ...
Ch10 Reading Guide
... FF. An axonal hillock is ____________________________________________________ GG. An axon is specialized to carry __________________________________________ HH. The cytoplasm of an axon includes _______________________________________ II. Collaterals are _____________________________________________ ...
... FF. An axonal hillock is ____________________________________________________ GG. An axon is specialized to carry __________________________________________ HH. The cytoplasm of an axon includes _______________________________________ II. Collaterals are _____________________________________________ ...
Slideshow
... membrane has a negative charge. • As the figure shows, a Na+ / K+ pump in the cell membrane pumps sodium out of the cell and potassium into it. • However, more potassium ions leak out of the cell. Thus the inside of the membrane builds up a net negative charge relative to the outside. ...
... membrane has a negative charge. • As the figure shows, a Na+ / K+ pump in the cell membrane pumps sodium out of the cell and potassium into it. • However, more potassium ions leak out of the cell. Thus the inside of the membrane builds up a net negative charge relative to the outside. ...
Review questions: Neuroanatomy
... Provide blood/brain barrier Hold down layers of meninges Blood brain barrier allows for selective crossing of materials and limits chemical variations in the environment of brain so there is no uncontrolled excitement. Microglia (CNS): Phagocytic ...
... Provide blood/brain barrier Hold down layers of meninges Blood brain barrier allows for selective crossing of materials and limits chemical variations in the environment of brain so there is no uncontrolled excitement. Microglia (CNS): Phagocytic ...
Nervous Tissue: Support Cells
... terminals are separated from the next neuron by a gap (they never really touch) – Synaptic cleft — gap (space) between adjacent neurons – Synapse — junction between nerves ...
... terminals are separated from the next neuron by a gap (they never really touch) – Synaptic cleft — gap (space) between adjacent neurons – Synapse — junction between nerves ...
neurocytol_lect
... for their polarity. Structurally the two most distinctive features of the neuron are its polarized shape and localized secretory function. ...
... for their polarity. Structurally the two most distinctive features of the neuron are its polarized shape and localized secretory function. ...
Chapter 3 Notes (part 1) 1. Basic Elements of the Nervous System (a
... selectively-permeable membrane which separates the cytoplasm from the extracellular matrix contains ion channels and protein pumps which manage the flow of ions (charged particles) into and out of the cell C. Axon The part of the cell which carries the electrical signal (action potential); in ...
... selectively-permeable membrane which separates the cytoplasm from the extracellular matrix contains ion channels and protein pumps which manage the flow of ions (charged particles) into and out of the cell C. Axon The part of the cell which carries the electrical signal (action potential); in ...
1 NOTES – CHAPTER 9 (Brief) The Nervous System – LECTURE
... around some axons 1) Specialized wrappings around axon; made of fat; is white in color 2) Excellent insulator and conductor; prevents almost all ion flow through the cell membrane 3) Nodes of Ranvier – gaps or indentations between neurolemmocytes; allow for the nerve impulses to travel faster; allow ...
... around some axons 1) Specialized wrappings around axon; made of fat; is white in color 2) Excellent insulator and conductor; prevents almost all ion flow through the cell membrane 3) Nodes of Ranvier – gaps or indentations between neurolemmocytes; allow for the nerve impulses to travel faster; allow ...
neurons and the nervous system
... neuron. Carries messages away from the cell body Myelin Sheath An insulating layer around an axon. Made up of Schwann cells. Nodes of Ranvier Gaps between Schwann cells. Function: Conduction of the impulse. (Situation where speed of an impulse is greatly increased by the message ‘jumping ...
... neuron. Carries messages away from the cell body Myelin Sheath An insulating layer around an axon. Made up of Schwann cells. Nodes of Ranvier Gaps between Schwann cells. Function: Conduction of the impulse. (Situation where speed of an impulse is greatly increased by the message ‘jumping ...
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.