Biology 211 Anatomy & Physiology I
... causing them to depolarize then repolarize. This, in turn, stimulates regions a little further out to depolarize and repolarize, so these events spread away from the original location. ...
... causing them to depolarize then repolarize. This, in turn, stimulates regions a little further out to depolarize and repolarize, so these events spread away from the original location. ...
Nervous Systems
... Exceptions include insects that have simply designed ears that allow the insects to hear calls of potential mates, rival males, or predators. Moths can detect the ultrasonic sounds of bats. ...
... Exceptions include insects that have simply designed ears that allow the insects to hear calls of potential mates, rival males, or predators. Moths can detect the ultrasonic sounds of bats. ...
The Nervous System
... The nervous system directs the function of all the human body systems (Figure 8-1). The nervous system is divided into two subsystems: the central nervous system (CNS) and the peripheral nervous system (PNS). A nerve cell or neuron is the basic element of the nervous system. All neurons have three p ...
... The nervous system directs the function of all the human body systems (Figure 8-1). The nervous system is divided into two subsystems: the central nervous system (CNS) and the peripheral nervous system (PNS). A nerve cell or neuron is the basic element of the nervous system. All neurons have three p ...
Motor Neuron
... region of the membrane • Na+ ions rush into the cell and K+ ions rush out depolarizing the region of the membrane • This region of depolarization is an Action Potential • An action potential in one region stimulates adjacent regions to depolarize and the action potential moves away from the point of ...
... region of the membrane • Na+ ions rush into the cell and K+ ions rush out depolarizing the region of the membrane • This region of depolarization is an Action Potential • An action potential in one region stimulates adjacent regions to depolarize and the action potential moves away from the point of ...
Nervous System
... (1) Satellite cells (amphicytes) – regulate the environment around the neurons, similar to astrocyte’s job (2) Schwann cells – myelinates only one segment of a single axon. Also engulfs damaged and dying nerve cells. ...
... (1) Satellite cells (amphicytes) – regulate the environment around the neurons, similar to astrocyte’s job (2) Schwann cells – myelinates only one segment of a single axon. Also engulfs damaged and dying nerve cells. ...
File - Lucinda Supernavage
... Parts of the neuron: • 1. Cell Body - contains the nucleus and two extensions • 2. Dendrites – shorter, more numerous, receive information • 3. Axons – single, long “fiber” which conducts impulse away from the cell body, sends information • 4. Myelin – wrapped around the axon of neurons; accelerates ...
... Parts of the neuron: • 1. Cell Body - contains the nucleus and two extensions • 2. Dendrites – shorter, more numerous, receive information • 3. Axons – single, long “fiber” which conducts impulse away from the cell body, sends information • 4. Myelin – wrapped around the axon of neurons; accelerates ...
LECTURE OUTLINE
... The nature of a nerve impulse can be characterized by voltage changes. Resting Potential When the axon is not conducting an impulse, the inside is negatively charged, and the outside is positively charged. There is approximately a -65 mV potential difference across the membrane. This charge differen ...
... The nature of a nerve impulse can be characterized by voltage changes. Resting Potential When the axon is not conducting an impulse, the inside is negatively charged, and the outside is positively charged. There is approximately a -65 mV potential difference across the membrane. This charge differen ...
Nervous Systems - Groupfusion.net
... membrane generate a net negative membrane potential (-70mV) • A sodium-potassium pump is used to move K+ back into the cell and Na+ back out of the cell to maintain the constant concentration gradients. ...
... membrane generate a net negative membrane potential (-70mV) • A sodium-potassium pump is used to move K+ back into the cell and Na+ back out of the cell to maintain the constant concentration gradients. ...
Biology 621 - Chapter 12 Midterm Exam Review
... 22. A(n) __ is an automatic response to a stimulus. 23 Subdivision of the PNS that regulates the activity of the heart and smooth muscle and of glands; also called the involuntary nervous system. ___ 24. ____ neurons carry impulses from receptors to the spinal cord. 25. What are the two major divisi ...
... 22. A(n) __ is an automatic response to a stimulus. 23 Subdivision of the PNS that regulates the activity of the heart and smooth muscle and of glands; also called the involuntary nervous system. ___ 24. ____ neurons carry impulses from receptors to the spinal cord. 25. What are the two major divisi ...
Neurotransmitter proteins
... • Controls thoughts, movement, life processes • Quick responses – Ex: Sunny day pupils shrinking ...
... • Controls thoughts, movement, life processes • Quick responses – Ex: Sunny day pupils shrinking ...
Chapter 35-2
... This causes the charges to reverse the membrane potential (- to +) - results from the leading edge of impulse opening Na channels which allows Na to flow into the cell - Action Potential – the reversal of charges from – to + - also called “nerve impulse” ...
... This causes the charges to reverse the membrane potential (- to +) - results from the leading edge of impulse opening Na channels which allows Na to flow into the cell - Action Potential – the reversal of charges from – to + - also called “nerve impulse” ...
File
... inactivation gates close in response to depolarization and the sodium ions can’t enter the cell anymore. The Na+ can only come in during a brief period when both activation and inactivation gates are open. ...
... inactivation gates close in response to depolarization and the sodium ions can’t enter the cell anymore. The Na+ can only come in during a brief period when both activation and inactivation gates are open. ...
The Electrochemical Impulse
... Binding depolarizes the membrane of the dendrites Na+ channels open, and the action potential is reintiated Inhibitory effect Opens K + channels in the membrane, so K + diffuses out The inner surface becomes even more negative in relation to the outer the membrane is hyperpolarized makes ...
... Binding depolarizes the membrane of the dendrites Na+ channels open, and the action potential is reintiated Inhibitory effect Opens K + channels in the membrane, so K + diffuses out The inner surface becomes even more negative in relation to the outer the membrane is hyperpolarized makes ...
Nervous Systems
... membrane generate a net negative membrane potential (-70mV) • A sodium-potassium pump is used to move K+ back into the cell and Na+ back out of the cell to maintain the constant concentration gradients. ...
... membrane generate a net negative membrane potential (-70mV) • A sodium-potassium pump is used to move K+ back into the cell and Na+ back out of the cell to maintain the constant concentration gradients. ...
The Nervous System
... signals. Majority of neurons are myelinated. • Node of Ranvier: gaps in the myelin sheath that allow for saltatory conduction of an action potential (i.e. the signal jumps from gap to gap) ...
... signals. Majority of neurons are myelinated. • Node of Ranvier: gaps in the myelin sheath that allow for saltatory conduction of an action potential (i.e. the signal jumps from gap to gap) ...
Plants and Pollinators
... channels in the membrane to open • As a result of ion flow through these channels, the inside of neuron briefly ...
... channels in the membrane to open • As a result of ion flow through these channels, the inside of neuron briefly ...
chapt10_holes_lecture_animation
... • White Matter • Contains myelinated axons • Considered fiber tracts • Gray Matter • Contains unmyelinated structures • Cell bodies, dendrites ...
... • White Matter • Contains myelinated axons • Considered fiber tracts • Gray Matter • Contains unmyelinated structures • Cell bodies, dendrites ...
Chp 9: NERVOUS TISSUE
... of the eye, inner ear, olfactory area of brain ______________________________: dendrites and one axon fused together forming a continuous process that emerges from cell body; begin in embryo as bipolar neurons; most function as sensory receptors for touch, pressure, pain, or thermal stimuli. Cell ...
... of the eye, inner ear, olfactory area of brain ______________________________: dendrites and one axon fused together forming a continuous process that emerges from cell body; begin in embryo as bipolar neurons; most function as sensory receptors for touch, pressure, pain, or thermal stimuli. Cell ...
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[j26]Chapter 7#
... next cell in the sequence via electrical synapses or gap junctions, or indirectly are responsible for activating the release of specialized neurotransmitter chemicals. Released from vesicles into the synaptic space, these neurotransmitters diffuse a short distance, bind to specialized receptors inte ...
... next cell in the sequence via electrical synapses or gap junctions, or indirectly are responsible for activating the release of specialized neurotransmitter chemicals. Released from vesicles into the synaptic space, these neurotransmitters diffuse a short distance, bind to specialized receptors inte ...
![[j26]Chapter 7#](http://s1.studyres.com/store/data/009487154_1-bf88061009d68b903e2c1573596f45de-300x300.png)
[j26]Chapter 7#
... required to maintain the proper, opposing concentration gradients of these two ions. ___ 36. Within a collection of axons (or nerves), a low-intensity stimulus will only activate those few fibers with low thresholds, whereas high-intensity stimuli can activate fibers with higher thresholds. ___ 37. ...
... required to maintain the proper, opposing concentration gradients of these two ions. ___ 36. Within a collection of axons (or nerves), a low-intensity stimulus will only activate those few fibers with low thresholds, whereas high-intensity stimuli can activate fibers with higher thresholds. ___ 37. ...
FUNCTIONAL CLASSIFICATION OF NERVE FIBER LEARNING
... Two types of nerve fibers are present in central and peripheral parts of nervous system Myelinated Non myelinated MYELINATED NERVE FIBER ...
... Two types of nerve fibers are present in central and peripheral parts of nervous system Myelinated Non myelinated MYELINATED NERVE FIBER ...
ACTION POTENTIALS
... cells. The voltage that exists across plasma membranes during the resting state of excitable cells; ranging from: • -90 to -20 millivolts Free to share, print, make copies and changes. Get yours at www.boundless.com ...
... cells. The voltage that exists across plasma membranes during the resting state of excitable cells; ranging from: • -90 to -20 millivolts Free to share, print, make copies and changes. Get yours at www.boundless.com ...
Chapter 17: Nervous System - Johnston Community College
... The action potential travels the length of an axon, with each portion of the axon undergoing depolarization then repolarization. A refractory period ensures that the action potential will not move backwards. In myelinated fibers, the action potential only occurs at the nodes of Ranvier. This “jumpin ...
... The action potential travels the length of an axon, with each portion of the axon undergoing depolarization then repolarization. A refractory period ensures that the action potential will not move backwards. In myelinated fibers, the action potential only occurs at the nodes of Ranvier. This “jumpin ...
Nervous System
... • A cell membrane is usually electrically charged, or polarized, so that the inside of the membrane is negatively charged with respect to the outside of the membrane (which is then positively charged). • This is as a result of unequal distribution of ions on the inside and the outside of the membran ...
... • A cell membrane is usually electrically charged, or polarized, so that the inside of the membrane is negatively charged with respect to the outside of the membrane (which is then positively charged). • This is as a result of unequal distribution of ions on the inside and the outside of the membran ...
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.