medullary cords
... antigens that circulate in the blood and lymph. For this purpose, lymph nodes contain a lot of macrophages. Lymphoid tissue in the nodes also produces antibodies and stores lymphocytes. Note: The nodes generally occur in clusters along the connecting lymphatic vessels particularly in the armpits, th ...
... antigens that circulate in the blood and lymph. For this purpose, lymph nodes contain a lot of macrophages. Lymphoid tissue in the nodes also produces antibodies and stores lymphocytes. Note: The nodes generally occur in clusters along the connecting lymphatic vessels particularly in the armpits, th ...
CHAPTER NINE: THE NERVOUS SYSTEM
... iii. Nodes of Ranvier-myelin sheath gaps between Schwann cells, sites where axon collaterals can emerge iv. CNS 1. Formed by processes of oligodendrocytes, Nodes of Ranvier not present, no ___________, thinnest fibers are unmyelinated v. _______ matter 1. Dense collections of myelinated fibers vi. _ ...
... iii. Nodes of Ranvier-myelin sheath gaps between Schwann cells, sites where axon collaterals can emerge iv. CNS 1. Formed by processes of oligodendrocytes, Nodes of Ranvier not present, no ___________, thinnest fibers are unmyelinated v. _______ matter 1. Dense collections of myelinated fibers vi. _ ...
doc Behavioural_Neuroscience_Jan_11
... Conduction of the Action Potential: 1. The movement of the information along the axon is referred to as conduction of the action potential. 2. Conduction occurs in a unidirectional manner. 3. The size of the action potential remains constant. 4. All-or-none law states that the action potent ...
... Conduction of the Action Potential: 1. The movement of the information along the axon is referred to as conduction of the action potential. 2. Conduction occurs in a unidirectional manner. 3. The size of the action potential remains constant. 4. All-or-none law states that the action potent ...
Given sufficient input, neurons “fire action potentials”
... Given sufficient input, neurons “fire action potentials” – fast voltage transients …which are communicated to downstream neurons via synapses INPUT ...
... Given sufficient input, neurons “fire action potentials” – fast voltage transients …which are communicated to downstream neurons via synapses INPUT ...
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 ...
Worksheet for Nervous Systems
... 14. Ganglia and nuclei are collections of ______ ______. How do they differ from one another? 15. Supporting cells, called ______ __________ are ____ 16. Which glial cells provide structural and metabolic support for neurons? ...
... 14. Ganglia and nuclei are collections of ______ ______. How do they differ from one another? 15. Supporting cells, called ______ __________ are ____ 16. Which glial cells provide structural and metabolic support for neurons? ...
CH 8 Nervous part 1
... humans and animals and can occur by inhalation, swallowing or absorption through eyes or mouth Strychnine is a neurotoxin which acts as an antagonist of acetylcholine receptors. It primarily affects the motor nerves in the spinal cord which control muscle contraction. An impulse is triggered at one ...
... humans and animals and can occur by inhalation, swallowing or absorption through eyes or mouth Strychnine is a neurotoxin which acts as an antagonist of acetylcholine receptors. It primarily affects the motor nerves in the spinal cord which control muscle contraction. An impulse is triggered at one ...
Neural Tissue
... • Impulse conducted directly through gap junction of adjacent cells • Direct signal transduction is spread from cell to cell • Provide faster communication and synchronization of activity for a large number of neurons or muscle fibers • Rare in CNS ...
... • Impulse conducted directly through gap junction of adjacent cells • Direct signal transduction is spread from cell to cell • Provide faster communication and synchronization of activity for a large number of neurons or muscle fibers • Rare in CNS ...
Action potentials travel along the axons of neurons.
... A nerve is usually composed of a bundle of neurons with Glial cells and blood vessel to supply needed materials. Neurons are not connected directly to one another – there are gaps (synapses) between the neurons. Action potentials travel along the axons of neurons. ...
... A nerve is usually composed of a bundle of neurons with Glial cells and blood vessel to supply needed materials. Neurons are not connected directly to one another – there are gaps (synapses) between the neurons. Action potentials travel along the axons of neurons. ...
nervous system ppt
... humans and animals and can occur by inhalation, swallowing or absorption through eyes or mouth - prevents the proper operation of the chemical that controls nerve signals to the muscles. The chemical controlling nerve signals works like the body's “off switch” for muscles. When this “off switch” doe ...
... humans and animals and can occur by inhalation, swallowing or absorption through eyes or mouth - prevents the proper operation of the chemical that controls nerve signals to the muscles. The chemical controlling nerve signals works like the body's “off switch” for muscles. When this “off switch” doe ...
Nervous System
... The two major ions are sodium (Na+) and potassium (K+). Sodium diffuses out of the neuron, and Potassium diffuses into the neuron.The two ions cross the membrane through channel proteins (3). Some channel proteins never shut, so the ions diffuse through them all the time. Other channel proteins act ...
... The two major ions are sodium (Na+) and potassium (K+). Sodium diffuses out of the neuron, and Potassium diffuses into the neuron.The two ions cross the membrane through channel proteins (3). Some channel proteins never shut, so the ions diffuse through them all the time. Other channel proteins act ...
9.01 Exam #1 September 27, 2004 30 multiple
... 21) Some have compared the "all or none" action potential to flushing a toilet. The absolute refractory period (when no amount of pressing the lever will produce another flush) is set by: a) the inactivation of voltage insensitive potassium channels b) the inactivation of voltage gated calcium chann ...
... 21) Some have compared the "all or none" action potential to flushing a toilet. The absolute refractory period (when no amount of pressing the lever will produce another flush) is set by: a) the inactivation of voltage insensitive potassium channels b) the inactivation of voltage gated calcium chann ...
Nervous System Study Guide
... 5. Definition and functioning process of resting potential (e.g. concentration amount of sodium and potassium amount inside and outside of neuron cell. 6. When a neuron at rest, what is the amount of sodium amount outside and inside the cell? 7. When a neuron at rest, what is the amount of K+ ions i ...
... 5. Definition and functioning process of resting potential (e.g. concentration amount of sodium and potassium amount inside and outside of neuron cell. 6. When a neuron at rest, what is the amount of sodium amount outside and inside the cell? 7. When a neuron at rest, what is the amount of K+ ions i ...
Nerves
... Myelin: spirally-wound wrapping of glial cell PM that surrounds axon (excludes cytoplasm; v. e- dense) Tight wrapping via adhesion molecules (intergral membrane proteins) Node of Ranvier – where myelin segments meet; ea. segment acts as an insulator causing the axn potential to regenerate at t ...
... Myelin: spirally-wound wrapping of glial cell PM that surrounds axon (excludes cytoplasm; v. e- dense) Tight wrapping via adhesion molecules (intergral membrane proteins) Node of Ranvier – where myelin segments meet; ea. segment acts as an insulator causing the axn potential to regenerate at t ...
Ppt
... Produce myelin sheath -increases the speed of impulses, insulator Myelin=lipid components Nodes of Ranvier-gaps in myelin sheath, axon contacts its external environment Schwann cells-glial cells in PNS that produce myelin sheath Mylenated vs. Unmyelinated axons Demylinated (multiple sclerosis) ...
... Produce myelin sheath -increases the speed of impulses, insulator Myelin=lipid components Nodes of Ranvier-gaps in myelin sheath, axon contacts its external environment Schwann cells-glial cells in PNS that produce myelin sheath Mylenated vs. Unmyelinated axons Demylinated (multiple sclerosis) ...
Chapter 10
... passing through. Between adjacent Schwann cells is a small gap called a node of Ranvier, where the nerve fiber is exposed. When a nerve impulse is conducted along a myelinated fiber, it “jumps” from node to node. This type of conduction is called saltatory conduction. An unmyelinated axon conducts a ...
... passing through. Between adjacent Schwann cells is a small gap called a node of Ranvier, where the nerve fiber is exposed. When a nerve impulse is conducted along a myelinated fiber, it “jumps” from node to node. This type of conduction is called saltatory conduction. An unmyelinated axon conducts a ...
nerve net
... • Chemicals that are secreted by the terminal branch into the synapse between neurons • Carry impulses from one cell to the next – Ex. Acetylcholine and Noradrenaline ...
... • Chemicals that are secreted by the terminal branch into the synapse between neurons • Carry impulses from one cell to the next – Ex. Acetylcholine and Noradrenaline ...
48 - Groupfusion.net
... -excitatory or inhibitory at other sites. ex)heart muscles-> inhibitory -certain bacteria produce a toxin that specifically inhibits presynaptic release of acetylcholine; toxin caused of food poisoning called botulism ...
... -excitatory or inhibitory at other sites. ex)heart muscles-> inhibitory -certain bacteria produce a toxin that specifically inhibits presynaptic release of acetylcholine; toxin caused of food poisoning called botulism ...
nervous system
... Saltatory Conduction • RAPID means of conducting an action potential (more rapid than ...
... Saltatory Conduction • RAPID means of conducting an action potential (more rapid than ...
Powerpoint slides
... About -70 mV Selectively allowing certain ions in With stimulation Na+ is allowed in ...
... About -70 mV Selectively allowing certain ions in With stimulation Na+ is allowed in ...
Chapter 7
... muscle contraction). Synaptic cleft: The tiny gap between axonal terminals and neuron. This functional junction is called a synapse. Myelin: Fatty material which covers most long nerve fibers. Myelin protects and insulates the fibers and increases the transmission rate of nerve impulses. *Axons outs ...
... muscle contraction). Synaptic cleft: The tiny gap between axonal terminals and neuron. This functional junction is called a synapse. Myelin: Fatty material which covers most long nerve fibers. Myelin protects and insulates the fibers and increases the transmission rate of nerve impulses. *Axons outs ...
Ch11AB
... The Axon generates and transmits nerve impulses called _______________ away from the neuronal cell body. (Slides 38-39) Molecules and organelles are moved along axons by motor molecules in these two directions: ...
... The Axon generates and transmits nerve impulses called _______________ away from the neuronal cell body. (Slides 38-39) Molecules and organelles are moved along axons by motor molecules in these two directions: ...
Nervous tissue is composed of two types of cells, neurons and glial
... hillock, the cytoplasm changes to a solution of limited components called axoplasm. Because the axon hillock represents the beginning of the axon, it is also referred to as the initial segment. Many axons are wrapped by an insulating substance called myelin, which is actually made from glial cells. ...
... hillock, the cytoplasm changes to a solution of limited components called axoplasm. Because the axon hillock represents the beginning of the axon, it is also referred to as the initial segment. Many axons are wrapped by an insulating substance called myelin, which is actually made from glial cells. ...
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.