Which of the following statements is false?○ Voltage, stretch, and temperature are all factors that regulate the opening of ions channelsThe whole cell current (macroscopic current) can be calculated by summing the manymicroscopic single channel currentsIt is not possible to predict the precise moment that a channel will be open or closed, onlythe probability that opening or closing will occurChanging the concentration gradient of an ion will cause an ion channel to open

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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Your friend has made an artificial membrane to study ion concentration gradients in a laboratory and is confused after observing the ion concentration gradient in the image below. Initially (Time 1) there was a very strong concentration gradient across the membrane and your friend expected that ions would move until the concentrations were equal across the membrane. For a short time there was movement of ions but this soon stopped and there is no further change in the situation no matter how long you wait (see Time 2). Time 1 You friend is confused because there is still a strong concentration gradient and there are open ion channels available. So why don't the concentrations equalise? After thinking about it you realise that there must be some information that is incorrect or missing from the diagram above. Select the image below that explains why the ion concentrations remain unequal across the membrane Time 2 Select the correct image by clicking on it (you can only select one…
Explain what is going on at sites A, B, C, D, F and G in relation to CHARGE (negative, positive, rising, falling) and open or closed Na+ and K+ ion channels +40 Voltage (mv) O -55 -70 Threshold B A 1 E D 2 3 Time (ms) F 4 G
How is the cell membrane like a battery? Membrane potential (think of the properties of a battery) Resting membrane potential Na+ and K+ ions -> -70 mV Na+/K+ pump Stored energy for work
A membrane potential (Vm) labeled axis on the graph In the graph draw the phases of the action potential Include the channels involved and when they open and close matching them to the Vm Indicate the periods in which the action potential can or cannot occur
what would the membrane potential be if the membrane became 10X more permeable to both sodium and chloride
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The traces below show the action potential waveforms in an external meidum of different concentrations of * 40 100% 50% 33% 40 1 2 time (msec) calcium chloride potassium O sodium
Choose all that apply [Na*] + [K'] | + + + + This diagram is a drawing of normal conditions that occur in a neuron's axon (not all details are included). This stage that a living neuron would be in, would show that no positive ions are inside the cell current is traveling down the axon the cell will be at rest once the Na ions enter the cell the cell is at rest Na ions are predominantly outside the cel
Our patient cannot remove potassium from their extracellular fluid. This is known as hyperkalemia. Describehow the two things above, the resting membrane potential and the action potential, would be different in someone with hyperkalemia.
Explain why a K+ channel does not allow Na+ or Ca2+ ions to pass through it – Na is the smallestwhile Ca is the largest.
threshold resting membrane potential decrease calcium channels increase action potentials The autonomic nervous system influences the heart rate. A sympathetic signal (norepinephrine) results in opening. This accelerates the process of reaching thereby resulting in a in time between successive action potentials. A parasympathetic signal (acetylcholine) results in the dropping to -70mV. This results in an in time for cells to reach threshold, thereby increasing the time between successive
*** fluorescence in bleached area- BLEACH WITH LASER BEAM bleach Protein 1 bleached area RECOVERY Figure 10-13 Molecular Biology of the Cell 6 (Garland Science 2015) Protein 2 *** ** *** time The diffusion/exchange rate of a protein can be measured by photobleaching techniques such as FRAP. When there is protein exchange (i.e. if the protein is mobile), fluorescence recovery in the bleached region occurs, as shown in the figure above. The graphs below show the fluorescence measurement of an area in the cell before and after bleaching for protein 1 and protein 2. Which protein has lower mobility? Protein 1 Protein 2 fluorescence in bleached area->> fluorescence in bleached area bleach BLEACH time RECOVERY time

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