![1. 2. a) Explain the compositions of white matter and gray matter](http://s1.studyres.com/store/data/000773153_1-7ec433f94c458684f62143d15653caa9-300x300.png)
1. 2. a) Explain the compositions of white matter and gray matter
... neurons and acts as a signal pathway for the gray matter regions of the central nervous system. Gray matter consists of glial cells and unmyelinated axons. It contains neuronal cell bodies. b) Explain shortly the structure of a neuron. ...
... neurons and acts as a signal pathway for the gray matter regions of the central nervous system. Gray matter consists of glial cells and unmyelinated axons. It contains neuronal cell bodies. b) Explain shortly the structure of a neuron. ...
Nerve impulses and Synapses Electro
... depolarization which may or may not be strong enough to make the post-synaptic neuron itself fire an action potential. • Neurons as “decision makers” constantly ask themselves: does total excitation minus total inhibition (minus resting leakage) depolarize the axon hillock sufficiently to start an a ...
... depolarization which may or may not be strong enough to make the post-synaptic neuron itself fire an action potential. • Neurons as “decision makers” constantly ask themselves: does total excitation minus total inhibition (minus resting leakage) depolarize the axon hillock sufficiently to start an a ...
Drugs Hanson 4
... • Excitatory synapse initiates an impulse in the receiving neuron when stimulated, causing release of neurotransmitters or increasing activity in target cell. • Inhibitory synapse diminishes likelihood of an impulse in the receiving neuron or reduces the activity in other target cells. ...
... • Excitatory synapse initiates an impulse in the receiving neuron when stimulated, causing release of neurotransmitters or increasing activity in target cell. • Inhibitory synapse diminishes likelihood of an impulse in the receiving neuron or reduces the activity in other target cells. ...
chapter 48
... ***A series of events converts the electrical signal of the action potential arriving at the synaptic terminal into a chemical signal that travels across the synapse, where it is converted back into an electrical signal in the postsynaptic cell. (electrical signal chemical signal electrical sign ...
... ***A series of events converts the electrical signal of the action potential arriving at the synaptic terminal into a chemical signal that travels across the synapse, where it is converted back into an electrical signal in the postsynaptic cell. (electrical signal chemical signal electrical sign ...
Document
... • Respond to spots of light • Respond to bars of light – Unlike simple cells • Respond to movement of bars of light in specific ...
... • Respond to spots of light • Respond to bars of light – Unlike simple cells • Respond to movement of bars of light in specific ...
Structure of a Neuron Transmission of “Information” Nerve Impulse
... – Across narrow gaps between cells ...
... – Across narrow gaps between cells ...
Neurons and how they communicate
... Neurons influence each other through the release of neurotransmitters – chemical substances that carry signals across the synaptic cleft When the action potential reaches the end of the axon at its terminal button the neurotransmitters are released to travel across the synaptic cleft ...
... Neurons influence each other through the release of neurotransmitters – chemical substances that carry signals across the synaptic cleft When the action potential reaches the end of the axon at its terminal button the neurotransmitters are released to travel across the synaptic cleft ...
Chapter 16A
... – free nerve endings, encapsulated nerve endings & olfactory receptors produce generator potentials – when large enough, it generates a nerve impulse in a firstorder neuron ...
... – free nerve endings, encapsulated nerve endings & olfactory receptors produce generator potentials – when large enough, it generates a nerve impulse in a firstorder neuron ...
CHAPTER NINE: THE NERVOUS SYSTEM
... i. An increase in membrane potential ii. Inside of the membrane becomes more negative than the resting potential iii. Reduces the probability of producing a nerve impulse c. Occur when a stimulus causes gated ion channels to open d. Decrease in magnitude with distance as ions flow and diffuse throug ...
... i. An increase in membrane potential ii. Inside of the membrane becomes more negative than the resting potential iii. Reduces the probability of producing a nerve impulse c. Occur when a stimulus causes gated ion channels to open d. Decrease in magnitude with distance as ions flow and diffuse throug ...
Chapter 12
... Smell: Odorant molecules reach the olfactory receptors in the nasal cavity where they bind to receptor cells. The nerve impulses travel along the olfactory nerve and synapse with neurons in the olfactory bulbs and then travel along the olfactory tracts to the limbic system of the brain, deep within ...
... Smell: Odorant molecules reach the olfactory receptors in the nasal cavity where they bind to receptor cells. The nerve impulses travel along the olfactory nerve and synapse with neurons in the olfactory bulbs and then travel along the olfactory tracts to the limbic system of the brain, deep within ...
53 XIX BLY 122 Lecture Notes (O`Brien)
... A. The anatomy of a neuron 1. Neurons consist of a cell body, dendrites, and one or more axons. Fig 45.3a 2. Neurons transmit information via electrical impulses. Fig 45.1a a. Sensory receptors transmit information about the internal or external environment to sensory neurons. b. Sensory neurons con ...
... A. The anatomy of a neuron 1. Neurons consist of a cell body, dendrites, and one or more axons. Fig 45.3a 2. Neurons transmit information via electrical impulses. Fig 45.1a a. Sensory receptors transmit information about the internal or external environment to sensory neurons. b. Sensory neurons con ...
31.1 The Neuron Functions of the Nervous System and external
... With fewer dopamine receptors available, larger amounts of drugs are required to produce a high. This can result in an addiction. 31.3 The Peripheral Nervous System The Sensory Division The peripheral nervous system consists of all the nerves and associated cells that are not part of the brain or sp ...
... With fewer dopamine receptors available, larger amounts of drugs are required to produce a high. This can result in an addiction. 31.3 The Peripheral Nervous System The Sensory Division The peripheral nervous system consists of all the nerves and associated cells that are not part of the brain or sp ...
Chapter Summary Chapter 5: Sensation and Perception • Sensation
... stimuli into neural impulses that our brains can perceive. The sensory cortex of the brain maps touch sensations. Especially sensitive or important body parts receive disproportionately large representation in the cortex. Pain travels to the brain via both a fast pathway and a slow pathway. The gate ...
... stimuli into neural impulses that our brains can perceive. The sensory cortex of the brain maps touch sensations. Especially sensitive or important body parts receive disproportionately large representation in the cortex. Pain travels to the brain via both a fast pathway and a slow pathway. The gate ...
Here we can focus directly on the input neurons, the Schaffer
... pyramidal cells. We now see on the right hand side this is the whole synaptic cell, notice we are now focusing on the post-synaptic cell. The early change for explicit memory storage is going to have a pull synaptic target rather than a p synaptic target. The Schaffer collaterals come in, they re ...
... pyramidal cells. We now see on the right hand side this is the whole synaptic cell, notice we are now focusing on the post-synaptic cell. The early change for explicit memory storage is going to have a pull synaptic target rather than a p synaptic target. The Schaffer collaterals come in, they re ...
Chapter 31 The Nervous System
... myelin sheath: insulating membrane surrounding the axon in some neurons ...
... myelin sheath: insulating membrane surrounding the axon in some neurons ...
AP Biology Reading Guide Chapter 48 Neurons synapses and
... Concept 48.4 Neurons communicate with other cells at synapses ...
... Concept 48.4 Neurons communicate with other cells at synapses ...
Nervous Dia rams
... 3. The connection between adjacent neurons. 4. The chemical secreted into the gap between neurons at a synapse. ...
... 3. The connection between adjacent neurons. 4. The chemical secreted into the gap between neurons at a synapse. ...
Nervous System = communication conduit b/w brain
... Neurons with myelin carry impulses associated with sharp pain. Neurons that lack myelin carry impulses associated with dull, throbbing pain. Action potential in these neurons travels much more slowly than they do in neurons with myelin. Synapse = small gap between axon of 1 neuron & dendrite o ...
... Neurons with myelin carry impulses associated with sharp pain. Neurons that lack myelin carry impulses associated with dull, throbbing pain. Action potential in these neurons travels much more slowly than they do in neurons with myelin. Synapse = small gap between axon of 1 neuron & dendrite o ...
chapter 4
... pressures over the course of evolution. 4.3 All senses have these features in common: they translate information, have thresholds, require constant decision making, detect changes, and are selective. Sensation begins with an environmental stimulus; all sensory systems have specialized cells called s ...
... pressures over the course of evolution. 4.3 All senses have these features in common: they translate information, have thresholds, require constant decision making, detect changes, and are selective. Sensation begins with an environmental stimulus; all sensory systems have specialized cells called s ...
Fundamentals of the Nervous System and
... A. The nervous system originates from a dorsal neural tube and neural crest, which begin as a layer of neuroepithelial cells that ultimately become the CNS. B. Differentiation of neuroepithelial cells occurs largely in the second month of development. C. Growth of an axon toward its target appears t ...
... A. The nervous system originates from a dorsal neural tube and neural crest, which begin as a layer of neuroepithelial cells that ultimately become the CNS. B. Differentiation of neuroepithelial cells occurs largely in the second month of development. C. Growth of an axon toward its target appears t ...
Chapter 3 – The nerve cell Study Guide Describe an integrate
... Bernard J. Baars and Nicole M. Gage 2012 Academic Press ...
... Bernard J. Baars and Nicole M. Gage 2012 Academic Press ...
Stimulus (physiology)
In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity. When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex via stimulus transduction. These sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from inside the body, as in chemoreceptors and mechanorceptors. An internal stimulus is often the first component of a homeostatic control system. External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response. In order for a stimulus to be detected with high probability, its level must exceed the absolute threshold; if a signal does reach threshold, the information is transmitted to the central nervous system (CNS), where it is integrated and a decision on how to react is made. Although stimuli commonly cause the body to respond, it is the CNS that finally determines whether a signal causes a reaction or not.