Ch. 7 - Nervous System
... VII Facial nerve—sensory for taste; motor fibers to the face VIII Vestibulocochlear nerve—sensory for balance and hearing IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera XI Accessory nerve—motor fibers ...
... VII Facial nerve—sensory for taste; motor fibers to the face VIII Vestibulocochlear nerve—sensory for balance and hearing IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera XI Accessory nerve—motor fibers ...
Chapter 17: Nervous System - Johnston Community College
... When an axon is not conducting a nerve impulse, the inside of an axon is negative (-65mV) compared to the outside; this is the resting potential. A sodium-potassium pump in the membrane actively transports Na+ out of the axon and K+ into the axon to establish resting potential. The membrane is more ...
... When an axon is not conducting a nerve impulse, the inside of an axon is negative (-65mV) compared to the outside; this is the resting potential. A sodium-potassium pump in the membrane actively transports Na+ out of the axon and K+ into the axon to establish resting potential. The membrane is more ...
Kevin
... 4. Special gates or channels open and let through a flood of charged particles (ions of Ca, Na, K, Cl). 5. The potential charge of the receiving neuron is changed and starts a new electrical signal, which represents the message received. 6. This takes less than one five-hundredths of a second; the m ...
... 4. Special gates or channels open and let through a flood of charged particles (ions of Ca, Na, K, Cl). 5. The potential charge of the receiving neuron is changed and starts a new electrical signal, which represents the message received. 6. This takes less than one five-hundredths of a second; the m ...
The Nervous System The master and
... _________________ nervous system – the _________________ nervous system. Regulates events that need to be _________________ and has two complimentary parts called _________________ and _________________ Figure 7.2: Page 224 ...
... _________________ nervous system – the _________________ nervous system. Regulates events that need to be _________________ and has two complimentary parts called _________________ and _________________ Figure 7.2: Page 224 ...
Ch10 Reading Guide
... BB. Mature neurons generally do not _____________________ but neural stem cells do. CC. Dendrites are usually highly _____________________________________________ to provide _______________________________________________________________ DD. Dendritic spines are _____________________________________ ...
... BB. Mature neurons generally do not _____________________ but neural stem cells do. CC. Dendrites are usually highly _____________________________________________ to provide _______________________________________________________________ DD. Dendritic spines are _____________________________________ ...
Nervous System PowerPoint
... •We need to identify the stimulus, receptor, sensory neuron, motor neuron, effector, and the response. ...
... •We need to identify the stimulus, receptor, sensory neuron, motor neuron, effector, and the response. ...
Nerve Tissue
... 1. Somatic (voluntary) nervous system-this is were our control of voluntary functions or conscious actions occur. 2. Autonomic (involuntary) nervous system-this you do not control but it happens (heart beating/digestion) ...
... 1. Somatic (voluntary) nervous system-this is were our control of voluntary functions or conscious actions occur. 2. Autonomic (involuntary) nervous system-this you do not control but it happens (heart beating/digestion) ...
Nervous System
... (reverse polarization or depolarization) 5. Reverse polarization at original site acts as a stimulus to adjacent region of membrane ...
... (reverse polarization or depolarization) 5. Reverse polarization at original site acts as a stimulus to adjacent region of membrane ...
Slide ()
... neuromuscular junction ensures that each muscle fiber innervated by the same neuron will generate an action potential and contract in response to an action potential in the motor neuron. Activation of one or a few motor neurons produces a simple extracellular voltage signal and a small contraction ( ...
... neuromuscular junction ensures that each muscle fiber innervated by the same neuron will generate an action potential and contract in response to an action potential in the motor neuron. Activation of one or a few motor neurons produces a simple extracellular voltage signal and a small contraction ( ...
Slide ()
... neuromuscular junction ensures that each muscle fiber innervated by the same neuron will generate an action potential and contract in response to an action potential in the motor neuron. Activation of one or a few motor neurons produces a simple extracellular voltage signal and a small contraction ( ...
... neuromuscular junction ensures that each muscle fiber innervated by the same neuron will generate an action potential and contract in response to an action potential in the motor neuron. Activation of one or a few motor neurons produces a simple extracellular voltage signal and a small contraction ( ...
THE NERVOUS SYSTEM - Fox Valley Lutheran High School
... Much slower than an electric current. (10cm to 1m/sec.) The strength of an impulse is always the same. ...
... Much slower than an electric current. (10cm to 1m/sec.) The strength of an impulse is always the same. ...
Physiology Lecture 6
... membrane potential. However, the gates of closed Na+ channels appear to flicker open (and quickly close) occasionally, allowing some Na+ to leak into the resting cell. The neuron at the resting membrane potential is much more permeable to K+ than to Na+, but some Na+ does enter the cell. Because of ...
... membrane potential. However, the gates of closed Na+ channels appear to flicker open (and quickly close) occasionally, allowing some Na+ to leak into the resting cell. The neuron at the resting membrane potential is much more permeable to K+ than to Na+, but some Na+ does enter the cell. Because of ...
chapter_12 - The Anatomy Academy
... depolarization decreases potential across cell membrane due to opening of gated Na+ channels • Na+ rushes in down concentration and electrical gradients • Na+ diffuses for short distance inside membrane producing a change in voltage called a local potential ...
... depolarization decreases potential across cell membrane due to opening of gated Na+ channels • Na+ rushes in down concentration and electrical gradients • Na+ diffuses for short distance inside membrane producing a change in voltage called a local potential ...
Slide ()
... Anatomy of the cochlea. A low magnification light micrograph of a near midmodiolar cross-section illustrates the tissues and fluid-filled spaces of the 2½ turns of the mouse cochlea. As indicated in the upper turn, the fluid spaces are the scala tympani and scala vestibuli filled with perilymph, and ...
... Anatomy of the cochlea. A low magnification light micrograph of a near midmodiolar cross-section illustrates the tissues and fluid-filled spaces of the 2½ turns of the mouse cochlea. As indicated in the upper turn, the fluid spaces are the scala tympani and scala vestibuli filled with perilymph, and ...
Neuro Physiology 1
... channels to propagate it. The final characteristic is a refractory period. This is a short period of time following propagation where there cannot be an immediate repolarisation. A consequence is that if two signals are travelling towards each other they will be unable to pass and cancel each other ...
... channels to propagate it. The final characteristic is a refractory period. This is a short period of time following propagation where there cannot be an immediate repolarisation. A consequence is that if two signals are travelling towards each other they will be unable to pass and cancel each other ...
Human Anatomy and Physiology 3rd Nine Weeks Study Guide
... “pulling action) (O2 is needed to sustain contraction- cellular respiration…when blood supply is low, myoglobin provides O2 or lactate will build up causing cramps…remember lactic acid cycle?) Threshold … minimum stimulus needed to cause a contraction Twitch… A single contraction of a muscle Summati ...
... “pulling action) (O2 is needed to sustain contraction- cellular respiration…when blood supply is low, myoglobin provides O2 or lactate will build up causing cramps…remember lactic acid cycle?) Threshold … minimum stimulus needed to cause a contraction Twitch… A single contraction of a muscle Summati ...
Chapter 7: The Nervous System
... use of their potential! C. Functional Properties of Neurons 1. Irritability- neurons have the ability to respond to a stimulus 2. Conductivity- the ability to transmit an impulse 3. The plasma membrane at rest is polarized, this is called the Resting potential (-70 mV); this means fewer positive ion ...
... use of their potential! C. Functional Properties of Neurons 1. Irritability- neurons have the ability to respond to a stimulus 2. Conductivity- the ability to transmit an impulse 3. The plasma membrane at rest is polarized, this is called the Resting potential (-70 mV); this means fewer positive ion ...
Chapter 27
... channels which allow Na+ ions to pass through while others permit the movement of K+ ions. In the resting state, these channels are closed, but become depolarized and open when stimulated. The gates of the sodium channel open more quickly than those of the potassium channel. This explains why sodium ...
... channels which allow Na+ ions to pass through while others permit the movement of K+ ions. In the resting state, these channels are closed, but become depolarized and open when stimulated. The gates of the sodium channel open more quickly than those of the potassium channel. This explains why sodium ...
Biology 621 - Chapter 12 Midterm Exam Review
... 4. Neurons carry information through the body in the form of a. nerve impulses. b. dendrites. c. axons. d. nerve fibers. 5. Which neurons conduct information toward the central nervous system? a. sensory neurons b. motor neurons c. interneurons d. none of the above 6. Neurons with myelin sheath cond ...
... 4. Neurons carry information through the body in the form of a. nerve impulses. b. dendrites. c. axons. d. nerve fibers. 5. Which neurons conduct information toward the central nervous system? a. sensory neurons b. motor neurons c. interneurons d. none of the above 6. Neurons with myelin sheath cond ...
53 XIX BLY 122 Lecture Notes (O`Brien)
... B. How Do Voltage-Gated Channels Work? 1. Na+ and K+ channels open and close in response to changes in voltage. 2. Changes in charges at the membrane surface alter the conformation of the channel proteins. a. Voltage-clamping studies—depolarization triggers the rapid opening of Na+ channels and the ...
... B. How Do Voltage-Gated Channels Work? 1. Na+ and K+ channels open and close in response to changes in voltage. 2. Changes in charges at the membrane surface alter the conformation of the channel proteins. a. Voltage-clamping studies—depolarization triggers the rapid opening of Na+ channels and the ...
Chp 9: Nervous tissue chp 11: autonomic nervous system chp 12
... decrease and increase the membrane potential and eventually restore it to its resting state Ability of muscle fibers and neurons to convert stimuli into action potential is called electrical excitability. Stimulus in cell’s environment changes resting membrane potential; if stimulus causes cell to d ...
... decrease and increase the membrane potential and eventually restore it to its resting state Ability of muscle fibers and neurons to convert stimuli into action potential is called electrical excitability. Stimulus in cell’s environment changes resting membrane potential; if stimulus causes cell to d ...
Rheobase
Rheobase is a measure of membrane excitability. In neuroscience, rheobase is the minimal current amplitude of infinite duration (in a practical sense, about 300 milliseconds) that results in the depolarization threshold of the cell membranes being reached, such as an action potential or the contraction of a muscle. In Greek, the root ""rhe"" translates to current or flow, and ""basi"" means bottom or foundation: thus the rheobase is the minimum current that will produce an action potential or muscle contraction.Rheobase can be best understood in the context of the strength-duration relationship (Fig. 1). The ease with which a membrane can be stimulated depends on two variables: the strength of the stimulus, and the duration for which the stimulus is applied. These variables are inversely related: as the strength of the applied current increases, the time required to stimulate the membrane decreases (and vice versa) to maintain a constant effect. Mathematically, rheobase is equivalent to half the current that needs to be applied for the duration of chronaxie, which is a strength-duration time constant that corresponds to the duration of time that elicits a response when the nerve is stimulated at twice rheobasic strength.The strength-duration curve was first discovered by G. Weiss in 1901, but it was not until 1909 that Louis Lapicque coined the term ""rheobase"". Many studies are being conducted in relation to rheobase values and the dynamic changes throughout maturation and between different nerve fibers. In the past strength-duration curves and rheobase determinations were used to assess nerve injury; today, they play a role in clinical identification of many neurological pathologies, including as Diabetic neuropathy, CIDP, Machado-Joseph Disease, and ALS.