暨 南 大 学 考 试 试 卷
... A. An action potential elicited at any point of the membrane can excite adjacent portions of the membrane. B. It propagates to the entire membrane with certain diminishment of its amplitude. C. It propagates via the local current. D. It propagates in the saltatory way in the myelinated nerve fibers. ...
... A. An action potential elicited at any point of the membrane can excite adjacent portions of the membrane. B. It propagates to the entire membrane with certain diminishment of its amplitude. C. It propagates via the local current. D. It propagates in the saltatory way in the myelinated nerve fibers. ...
Your Nervous System
... Impulse Transmission Start with a RESTING neuron – one NOT transmitting an impulse Plasma membrane controls [ ] of ions inside the cell Na+ and K+ on both sides of membrane Na+ Higher Conc Outside K+ Higher Conc Inside Remember Na+/K+ ATPase Pump ...
... Impulse Transmission Start with a RESTING neuron – one NOT transmitting an impulse Plasma membrane controls [ ] of ions inside the cell Na+ and K+ on both sides of membrane Na+ Higher Conc Outside K+ Higher Conc Inside Remember Na+/K+ ATPase Pump ...
Neuroglia - wsscience
... Chemical gradients- Drive sodium ions into the cell. Electrical gradients- Potassium ions leave the cytoplasm more rapidly than sodium ions enter. Current- A movement of charges to eliminate a potential difference. Resistance- A measure of how much the membrane restricts ion movement. Elec ...
... Chemical gradients- Drive sodium ions into the cell. Electrical gradients- Potassium ions leave the cytoplasm more rapidly than sodium ions enter. Current- A movement of charges to eliminate a potential difference. Resistance- A measure of how much the membrane restricts ion movement. Elec ...
The Nervous System Ch. 12 & 13
... As more Na+ comes inside, the voltage inside the cell gets closer and closer to 0 mV and will continue to +30 mV. Means we now have more + ions in the cell than outside of the cell. Voltage-gated Na+ channels only stay open for about 1 millisecond before they close. Action potentials are all-or-none ...
... As more Na+ comes inside, the voltage inside the cell gets closer and closer to 0 mV and will continue to +30 mV. Means we now have more + ions in the cell than outside of the cell. Voltage-gated Na+ channels only stay open for about 1 millisecond before they close. Action potentials are all-or-none ...
CHAPTER 12 AND 13 OUTLINE
... It is generated by different concentrations of Na+, K+, Cl, and protein anions (A) ...
... It is generated by different concentrations of Na+, K+, Cl, and protein anions (A) ...
Hearing and Equilibrium Human Ear Major questions Anatomy of
... • Perilymph vibrating -->basilar membrane--> stereocilia flex back and forth in or against tectorial membrane • Mechanical opening of ion channels ...
... • Perilymph vibrating -->basilar membrane--> stereocilia flex back and forth in or against tectorial membrane • Mechanical opening of ion channels ...
The Nervous System
... How does the cell membrane become polarized in a neuron? What are the major ions associated with generating a membrane potential? Which ions are present in large amounts inside and outside the cell? What causes the inside of the cell to be more negative (less positive) compared with the outside? How ...
... How does the cell membrane become polarized in a neuron? What are the major ions associated with generating a membrane potential? Which ions are present in large amounts inside and outside the cell? What causes the inside of the cell to be more negative (less positive) compared with the outside? How ...
Chapter 12
... Myelination 13. Iden4tify the cells that produce myelin, describe how the sheath is formed, and discuss its function. Gray and White Matter 14. Describe the difference between gray and white matter, and give examples of each. ELECTRICAL SIGNALS IN NEURONS 15. Distinguish between action potential and ...
... Myelination 13. Iden4tify the cells that produce myelin, describe how the sheath is formed, and discuss its function. Gray and White Matter 14. Describe the difference between gray and white matter, and give examples of each. ELECTRICAL SIGNALS IN NEURONS 15. Distinguish between action potential and ...
Chapter 48 and 49 Name_______________________________
... Sodium-potassium pumps use the energy of ATP to maintain these K+ and Na+ gradients across the plasma membrane These concentration gradients represent chemical potential energy ...
... Sodium-potassium pumps use the energy of ATP to maintain these K+ and Na+ gradients across the plasma membrane These concentration gradients represent chemical potential energy ...
Chapter 27
... from inside is greater than Na+ gain a net loss of K+ from inside -ve charge inside ...
... from inside is greater than Na+ gain a net loss of K+ from inside -ve charge inside ...
Paper: A differentially amplified motion in the ear for near
... reticular lamina, where stereocilia reside, were enhanced, had different frequency dependence and a different timing from the commonly measured vibrations of the basilar membrane. However, the full resolution of this conundrum will probably require the development of new experimental techniques that ...
... reticular lamina, where stereocilia reside, were enhanced, had different frequency dependence and a different timing from the commonly measured vibrations of the basilar membrane. However, the full resolution of this conundrum will probably require the development of new experimental techniques that ...
Biology 2401 Anatomy and Physiology I notes
... ions and molecules on either side of the membrane (chemical concentration gradient and electrical gradient = electrochemical gradient) - sodium-potassium pumps move 3 sodium (Na+) ions out and 2 potassium (K+) ions in (these pumps require ATP energy) - some K+ leaks out through K+ leak channels (ope ...
... ions and molecules on either side of the membrane (chemical concentration gradient and electrical gradient = electrochemical gradient) - sodium-potassium pumps move 3 sodium (Na+) ions out and 2 potassium (K+) ions in (these pumps require ATP energy) - some K+ leaks out through K+ leak channels (ope ...
File - Mrs. LeCompte
... Resting Potential = when the axon is not conducting an impulse (about -70 mV) ...
... Resting Potential = when the axon is not conducting an impulse (about -70 mV) ...
Chapter 10
... transport substances between the neurons and blood vessels. Astrocytes are joined together by gap junctions, providing a channel for circulating calcium ions. Other duties include metabolism of substances (such as glucose), keeping the synaptic clefts free of excess ions and neurotransmitters, and s ...
... transport substances between the neurons and blood vessels. Astrocytes are joined together by gap junctions, providing a channel for circulating calcium ions. Other duties include metabolism of substances (such as glucose), keeping the synaptic clefts free of excess ions and neurotransmitters, and s ...
Ch 49 Pract Test Nervous System
... Which statement about the resting potential of a neuron is true? a. Sodium ions are in balance inside and outside the neuron’s membrane. b. There are many times more sodium ions outside the neuron’s membrane than inside. c. There are fewer potassium ions inside the neuron’s membrane than outside. d ...
... Which statement about the resting potential of a neuron is true? a. Sodium ions are in balance inside and outside the neuron’s membrane. b. There are many times more sodium ions outside the neuron’s membrane than inside. c. There are fewer potassium ions inside the neuron’s membrane than outside. d ...
Chapter 28- Nervous System
... from sending info, action potentials can be converted to chemical signals (neurotransmitters) • The action potential triggers vesicles to fuse with plasma membrane • Neurotransmitters bind to receptors and open ion channels to ions that start new action potential or stops one • Neurotransmitter is t ...
... from sending info, action potentials can be converted to chemical signals (neurotransmitters) • The action potential triggers vesicles to fuse with plasma membrane • Neurotransmitters bind to receptors and open ion channels to ions that start new action potential or stops one • Neurotransmitter is t ...
Nervous System: Levels of Organization Review and
... Compare the structure of myelinated vs. unmyelinated axons. Distinguish between white matter and gray matter. Describe the transmembrane potential or voltage across the cell membrane and how it is measured. Contrast the relative concentrations of ions in body solutions inside and outside of a cell ( ...
... Compare the structure of myelinated vs. unmyelinated axons. Distinguish between white matter and gray matter. Describe the transmembrane potential or voltage across the cell membrane and how it is measured. Contrast the relative concentrations of ions in body solutions inside and outside of a cell ( ...
Physio lecture 9 Membrane and Action Potentials
... • Which force is greater? • The larger force wins! Every cell has a separation of charge; the #1 reason is the leakiness of K. It leaks out all the time, and the Na pushes K back in. We use this electricity to do work. Blood pressure, peristalsis of intestines, muscles, etc, use this electricity for ...
... • Which force is greater? • The larger force wins! Every cell has a separation of charge; the #1 reason is the leakiness of K. It leaks out all the time, and the Na pushes K back in. We use this electricity to do work. Blood pressure, peristalsis of intestines, muscles, etc, use this electricity for ...
Unit IV-D Outline
... inside and outside the body of the organism must be controlled in amount and directed to the right place b. coordination – responses to a wide variety of changes that take place both inside and outside the body of the organism must be made to take place in the right order or relationship c. irritabi ...
... inside and outside the body of the organism must be controlled in amount and directed to the right place b. coordination – responses to a wide variety of changes that take place both inside and outside the body of the organism must be made to take place in the right order or relationship c. irritabi ...
Nervous and Endocrine Systems
... Aggression; Serial killers low levels; important for sleep and low levels assoc with depression ...
... Aggression; Serial killers low levels; important for sleep and low levels assoc with depression ...
Resting potential
The relatively static membrane potential of quiescent cells is called the resting membrane potential (or resting voltage), as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential.Apart from the latter two, which occur in excitable cells (neurons, muscles, and some secretory cells in glands), membrane voltage in the majority of non-excitable cells can also undergo changes in response to environmental or intracellular stimuli. In principle, there is no difference between resting membrane potential and dynamic voltage changes like action potential from a biophysical point of view: all these phenomena are caused by specific changes in membrane permeabilities for potassium, sodium, calcium, and chloride ions, which in turn result from concerted changes in functional activity of various ion channels, ion transporters, and exchangers. Conventionally, resting membrane potential can be defined as a relatively stable, ground value of transmembrane voltage in animal and plant cells.Any voltage is a difference in electric potential between two points—for example, the separation of positive and negative electric charges on opposite sides of a resistive barrier. The typical resting membrane potential of a cell arises from the separation of potassium ions from intracellular, relatively immobile anions across the membrane of the cell. Because the membrane permeability for potassium is much higher than that for other ions (disregarding voltage-gated channels at this stage), and because of the strong chemical gradient for potassium, potassium ions flow from the cytosol into the extracellular space carrying out positive charge, until their movement is balanced by build-up of negative charge on the inner surface of the membrane. Again, because of the high relative permeability for potassium, the resulting membrane potential is almost always close to the potassium reversal potential. But in order for this process to occur, a concentration gradient of potassium ions must first be set up. This work is done by the ion pumps/transporters and/or exchangers and generally is powered by ATP.In the case of the resting membrane potential across an animal cell's plasma membrane, potassium (and sodium) gradients are established by the Na+/K+-ATPase (sodium-potassium pump) which transports 2 potassium ions inside and 3 sodium ions outside at the cost of 1 ATP molecule. In other cases, for example, a membrane potential may be established by acidification of the inside of a membranous compartment (such as the proton pump that generates membrane potential across synaptic vesicle membranes).