Assuming normal concentrations of all ions inside and outside of the cell, and that K+ and Cl- channels are blocked but Na+ channels are open, the membrane potential will be ________.
A. 70 mV
B. -60 mV
C. + 60 mV
D. +30 mV
Correct option is C.
When only sodium ion channels remains open,the membrane will have a potential of +60 mV.
Assuming normal concentrations of all ions inside and outside of the cell, and that K+ and...
Potassium ions (K+)(K+) move across a 9.0-nm-9.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is −60.0 mV,−60.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electricΔU electric of the potassium ions as they move across the membrane? Δ? electric = ... J?
Potassium ions (K+) move across a 7.0-nm- thick cell membrane from the inside to the outside. The potential inside the cell is −80.0 mV, and the potential outside is zero. What is the change in the electrical potential energy Δ? electric of the potassium ions as they move across the membrane?
Below are relative concentrations of various molecules and ions outside relative to inside of the cells. Answer the following questions regarding these molecules and transport across the plasma membrane. Concentration outside relative to inside: Ca2+ = high Amino acid = low Glucose = low K+ = low Cl- = high Which of the molecules/ions would require energy to move from the inside to the Outside? A. Amino acid, Glucose, and K+ B. Cl- C. Cl-,K+ and Ca2+ D. Cl-and Ca2+...
A model cell contains the intracellular ions Na+, K+, Cl-, and An- (impermeant anions) and the extracellular ions Na+, K+, and Cl-. The concentration (activities) of [Na+]o=125 mmol l-1, [K+]o = 5 mmol l-1, whereas [An-]i = 123 mmol l-1, [K+]i= 112 mmol l-1. Assume the membrane is permeable to Na+, K+, and Cl-. [ The subscripts i and o refer to inside and outside, respectively]. The relative permeabilities for the ions are pNa/pK=0.02, pCl/pK=0.1 a) What are the values...
Under certain circumstances, potassium ions ( K+ ) in a cell will move across the cell membrane from the inside to the outside. The potential inside the cell is −65.5 mV and the potential outside the cell is zero. What is the change in the electrical potential energy of a single potassium ion as it moves across the membrane? change in potential energy: ???J Does the potential energy of the potassium ions increase, decrease, or remain the same as the...
1. Animal cells have a Na,K pump that couples the energy of ATP hydrolysis to transport 3 Na ions out of the cell and 2 K ions into the cell. Inside astrocytes, the concentration of Na is 20 mM and the concentration of K is 130 mM. The extracellular concentrations of Na and K are 145 mM and 5 mM, respectively. Calculate the energy required for the transport of Na and K , with this stoichiometry; assume that the cell...
Under certain circumstances, potassium ions (K+) in a cell will move across the cell membrane from the inside to the outside. The potential inside the cell is-80.5 mV and the potential outside the cell is zero. What is the change in the electrical potential energy of a single potassium ion as it moves across the membrane? change in potential energy: Does the potential energy of the potassium ions increase, decrease, or remain the same as the ions move from the...
1. If the membrane potential of sodium ions in a cell is equal to +60 mV, what is its membrane potential for chloride ions if they are found in the exact same concentrations as sodium? Give your answer in mV. 2. Given a cell membrane with the following parameters- Ion Extracellular concentration (mmol/L) Intracellular concentration (mmol/L) Permeability K+ 10 150 1 Na+ 140 15 0.04 Cl- 100 7 0.45 calculate the membrane potential of the cell in mV. (Round your...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00380 M inside the cell, and a concentration of 0.145 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 310 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow. (answer in mV) Answer: 696.77 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion concentration of 0.00300 M inside the cell, and a concentration of 0.115 M outside the cell, what is the electrical potential across the cell membrane? Body temperature is 300 K. The sign identifies the change in the electrical potential across the membrane and which way the ions flow (answer in mV) Answer 04684 Check
Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a...