Nervous System
... threshold is reached (-50 mV) – always creates the same voltage spike regardless of intensity of the stimulus. • The frequency of the action potentials increases with intensity of stimulus. • Action potentials travel in only ONE direction! • The greater the axon diameter, the faster action potential ...
... threshold is reached (-50 mV) – always creates the same voltage spike regardless of intensity of the stimulus. • The frequency of the action potentials increases with intensity of stimulus. • Action potentials travel in only ONE direction! • The greater the axon diameter, the faster action potential ...
G. Nervous system physiology a. Explain the basic
... Channels are concentrated at the Nodes of Ranvier. When an action potential occurs at one node, it induces a depolarization at the adjacent node, starting another action potential if the node is not refractory. This is saltatory conduction. Because of the refractory period, saltatory conduction is u ...
... Channels are concentrated at the Nodes of Ranvier. When an action potential occurs at one node, it induces a depolarization at the adjacent node, starting another action potential if the node is not refractory. This is saltatory conduction. Because of the refractory period, saltatory conduction is u ...
Frequently asked questions Psychology 1010.06M A Biologically-Oriented
... • Glia wrap around axon • This insulation is called myelin • Nodes of Ranvier – Gaps between glia ...
... • Glia wrap around axon • This insulation is called myelin • Nodes of Ranvier – Gaps between glia ...
HUMAN PHYSIOLOGY
... After studying this chapter, students should be able to . . . 1. describe the structure of a neuron and explain the functional significance of its principal regions. 2. explain what is meant by the blood-brain barrier and discuss its significance. 3. describe the sheath of Schwann and explain how it ...
... After studying this chapter, students should be able to . . . 1. describe the structure of a neuron and explain the functional significance of its principal regions. 2. explain what is meant by the blood-brain barrier and discuss its significance. 3. describe the sheath of Schwann and explain how it ...
Information Processing in Motor Learning
... Allows information to travel throughout the body to various destinations Sport Books Publisher ...
... Allows information to travel throughout the body to various destinations Sport Books Publisher ...
Chapter 48 Nervous Systems
... Bind to receptors on neurons, muscle cells, or gland cells Broken down by enzymes or taken back up into surrounding cells Types of neurotransmitters: Excitatory: speed up impulses by causing depolarization of postsynaptic membrane Inhibitory: slow impulses by causing hyperpolarization of postsyn ...
... Bind to receptors on neurons, muscle cells, or gland cells Broken down by enzymes or taken back up into surrounding cells Types of neurotransmitters: Excitatory: speed up impulses by causing depolarization of postsynaptic membrane Inhibitory: slow impulses by causing hyperpolarization of postsyn ...
Sensory Receptors
... membrane “less negative”). Once this happens, an impulse is transmitted to other parts of the body. • The impulse is transmitted through neurones as action potentials from one part of the body to the other. ...
... membrane “less negative”). Once this happens, an impulse is transmitted to other parts of the body. • The impulse is transmitted through neurones as action potentials from one part of the body to the other. ...
neurotransmitters
... The Outer Nervous System is made of the nerves and the sense organs. Nerves ...
... The Outer Nervous System is made of the nerves and the sense organs. Nerves ...
Human Anatomy - Fisiokinesiterapia
... Occur within both the CNS and the PNS. are smaller than neurons are capable of mitosis. do not transmit nerve impulses. ...
... Occur within both the CNS and the PNS. are smaller than neurons are capable of mitosis. do not transmit nerve impulses. ...
Human Anatomy, First Edition McKinley&O'Loughlin
... Occur within both the CNS and the PNS. are smaller than neurons are capable of mitosis. do not transmit nerve impulses. ...
... Occur within both the CNS and the PNS. are smaller than neurons are capable of mitosis. do not transmit nerve impulses. ...
The Nervous System
... through the cell body and to the end of the axon. The message causes chemicals, neurotransmitters, to be released from the end of the axon into the space between the axon of one neuron and the dendrites of another The neurotransmitters then travel across the synapse on the receptors on the dendrites ...
... through the cell body and to the end of the axon. The message causes chemicals, neurotransmitters, to be released from the end of the axon into the space between the axon of one neuron and the dendrites of another The neurotransmitters then travel across the synapse on the receptors on the dendrites ...
ANSWERS TO CHAPTER 8
... 3. Multipolar neurons: several dendrites and one axon, includes motor neurons; bipolar neurons: one dendrite and one axon, found in the eye and nose; unipolar neurons: a single process that functions as an axon and a dendrite, includes most sensory neurons. 4. Astrocytes: participate with the endoth ...
... 3. Multipolar neurons: several dendrites and one axon, includes motor neurons; bipolar neurons: one dendrite and one axon, found in the eye and nose; unipolar neurons: a single process that functions as an axon and a dendrite, includes most sensory neurons. 4. Astrocytes: participate with the endoth ...
Chapter 11 ppt A
... Long axons called nerve fibers Occasional branches (axon collaterals) Branches profusely at end (terminus) Can be 10,000 terminal branches Distal endings called axon terminals or ...
... Long axons called nerve fibers Occasional branches (axon collaterals) Branches profusely at end (terminus) Can be 10,000 terminal branches Distal endings called axon terminals or ...
Shier, Butler, and Lewis: Hole`s Human Anatomy and Physiology
... 4. The refractory period limits how many action potentials may be generated in a neuron in a given time. H. Impulse Conduction 1. Myelin serves as an insulator. 2. Saltatory conduction is the type of nerve impulse conduction that occurs only at nodes. 3. Myelinated axons exhibit salutatory conductio ...
... 4. The refractory period limits how many action potentials may be generated in a neuron in a given time. H. Impulse Conduction 1. Myelin serves as an insulator. 2. Saltatory conduction is the type of nerve impulse conduction that occurs only at nodes. 3. Myelinated axons exhibit salutatory conductio ...
CHAPTER EIGHT
... Basics of Membrane Potentials - the intracellular and extracellular fluids contain almost equal concentrations of positive and negative ions - a minute excess of negative ions accumulates on the inside of the membrane - an equally minute concentration of positive ions accumulates on the outside of ...
... Basics of Membrane Potentials - the intracellular and extracellular fluids contain almost equal concentrations of positive and negative ions - a minute excess of negative ions accumulates on the inside of the membrane - an equally minute concentration of positive ions accumulates on the outside of ...
NeuroReview3
... • Virtually nonexistent in the CNS Of adult mammals • Does occur in the PNS of adult mammals ...
... • Virtually nonexistent in the CNS Of adult mammals • Does occur in the PNS of adult mammals ...
Physio Lab 5 PhysioEx 3
... All cells have a resting membrane potential (RMP). Intracellular fluid is rich in negatively charged proteins that are balanced mainly by positively charge potassium ions. As the cell membrane is permeable or “leaky” to potassium but not to protein, the excess unbalanced negative charge leads to the ...
... All cells have a resting membrane potential (RMP). Intracellular fluid is rich in negatively charged proteins that are balanced mainly by positively charge potassium ions. As the cell membrane is permeable or “leaky” to potassium but not to protein, the excess unbalanced negative charge leads to the ...
Ch. 48 - Ltcconline.net
... C. Action potential regenerates itself along the neuron 1. action potential is a localized electrical event - change from resting potential at a specific point 2. to function as a signal, action potential (local event) must travel along neuron (Fig. 48.14) 3. nerve signal starts out as one action p ...
... C. Action potential regenerates itself along the neuron 1. action potential is a localized electrical event - change from resting potential at a specific point 2. to function as a signal, action potential (local event) must travel along neuron (Fig. 48.14) 3. nerve signal starts out as one action p ...
Review Questions: 1. A tissue is a A. structure contained within a cell
... 6. Hyperventilation causes the loss of large amounts of carbon dioxide from the body, decreasing the amount of hydrogen ions in solution. As a result, A. the pH of body fluids will rise. B. the pH of body fluids will fall. C. the pH of body fluids will become neutral. D. the pH of body fluids will ...
... 6. Hyperventilation causes the loss of large amounts of carbon dioxide from the body, decreasing the amount of hydrogen ions in solution. As a result, A. the pH of body fluids will rise. B. the pH of body fluids will fall. C. the pH of body fluids will become neutral. D. the pH of body fluids will ...
Myers Module Four
... depolarization and an action potential. This depolarization produces another action potential a little farther along the axon. Gates in this neighbouring area are now open, and sodium ions rush in. The sodium/potassium pump in the cell membrane transports the sodium ions back out of the cell. ...
... depolarization and an action potential. This depolarization produces another action potential a little farther along the axon. Gates in this neighbouring area are now open, and sodium ions rush in. The sodium/potassium pump in the cell membrane transports the sodium ions back out of the cell. ...
Nervous Tissue NOTES
... this happens at one location on the axon, it affects the next section, and the next section… This sends the electrical impulse (action potential) along the entire axon As the signal travels along the axon, Na+ rushes into the cell as K+ rushes out of the cell to try to repolarize the membran ...
... this happens at one location on the axon, it affects the next section, and the next section… This sends the electrical impulse (action potential) along the entire axon As the signal travels along the axon, Na+ rushes into the cell as K+ rushes out of the cell to try to repolarize the membran ...
Neurons - Manatee School for the Arts
... http://www.colorado.edu/kines/Class/IPHY3430-200/image/gila.jpg ...
... http://www.colorado.edu/kines/Class/IPHY3430-200/image/gila.jpg ...
Chapter 10: Nervous System I: Basic Structure and Function
... 2. The trigger zone contains many voltage-gated sodium channels. 3. At the resting membrane potential, sodium channels are closed but when threshold is reached, sodium channels open. 4. As sodium ions rush into the cell, the membrane potential changes and temporarily becomes positive on the inside. ...
... 2. The trigger zone contains many voltage-gated sodium channels. 3. At the resting membrane potential, sodium channels are closed but when threshold is reached, sodium channels open. 4. As sodium ions rush into the cell, the membrane potential changes and temporarily becomes positive on the inside. ...
Neurohistology I
... sheath is richer in phospholipid & has less glycolipid then CNS myelin. The myelin is produced by the membrane of lemmocytes (Schwann Cells). Lemmocytes, derived from neural crest, are the supporting cells of the PNS. You will find them associated with all peripheral nerve fibers. A Fig. 4: Myelin P ...
... sheath is richer in phospholipid & has less glycolipid then CNS myelin. The myelin is produced by the membrane of lemmocytes (Schwann Cells). Lemmocytes, derived from neural crest, are the supporting cells of the PNS. You will find them associated with all peripheral nerve fibers. A Fig. 4: Myelin P ...
Your Nervous System
... Membrane becomes permeable to Na+ for an instant and they quickly move into the cell The inner surface of the cell membrane is now more positively charged then the outside. ...
... Membrane becomes permeable to Na+ for an instant and they quickly move into the cell The inner surface of the cell membrane is now more positively charged then the outside. ...
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.