Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- Two scientists calculated the membrane potential of a neuron using two different equations, the Nernst equation and the Goldman equation. Their calculations gave them slightly different predictions. What is the most likely reason for this difference? The lipid compositions of the cell membranes that the scientists studied were different. The scientists placed their measuring electrodes in slightly different positions. The temperatures of the fluid surrounding the cell membranes were different. The numbers of ions considered in the calculations were different. The scientists measured different numbers of cells.arrow_forwardPlease answer question 32arrow_forwardExplain 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 Garrow_forward
- 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 workarrow_forwardChoose all that apply Repolarization is a time when __________________ the cell is beginning to conduct . current the earth's poles invert. Na ions are exiting the cell. the cell is returning to resting . potential K ions exit the cell .arrow_forwardThe equilibrium potential for a given ion (Eion) is a theoretical value. For a given concentration gradient of an ion, the equilibrium potential is the charge inside the cell required to hold an ion at that concentration. That is, it is the charge required to perfectly oppose the drive of the ion to move down its concentration gradient. So, if the concentration of Nat is higher outside the cell than inside, its equilibrium potential (ENa) must be I and if we add more sodium to the extracellular fluid, then ENa will II.arrow_forward
- Which image represents depolarizing graded potential?arrow_forwardThe membrane of a neuron is vital to its ability to respond to signals from other neurons. Which of the following statements about this membrane is NOT accurate It ensures that the interior of the cell has a slightly positive charge at rest. It is selectively permeable, allowing ions to move in and out of the cell. It contains different types of specialized protein ion channels. It is made of two layers of lipids (fat molecules)arrow_forwardAll of the following are true for neurons EXCEPT neurons must produce many proteins neurons are electrically excitable cells neurons have a relatively high consumption of oxygen neurons undergo mitosisarrow_forward
- Which of the following statements about ion channels are true? all ion channels are selective for only one species of ion The only way ions can cross the membrane is through the actions of a transporter. ions can flow though the pores of ion channels faster than they can diffuse freely in solution the movement of ions through the pore of an ion channel does not require energyarrow_forwardIn excitable cells, such as neurons, K+ is held at a much higher concentration inside the cell than outside. Which of the following would hold K+ at this concentration?arrow_forwardWhich of the following statements is false? ○ Voltage, stretch, and temperature are all factors that regulate the opening of ions channels The whole cell current (macroscopic current) can be calculated by summing the many microscopic single channel currents It is not possible to predict the precise moment that a channel will be open or closed, only the probability that opening or closing will occur Changing the concentration gradient of an ion will cause an ion channel to openarrow_forward
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