8) The Na+/K+-ATPase enzyme helps cells maintain their membrane potential. For every (1/2/3/4) sodium ions that...
8) The Na+/K+-ATPase enzyme helps cells maintain their membrane potential. For every (1/2/3/4) sodium ions that are (Pumped in/Pumped out), (1/2/3/4) potassium ions are (Pumped in/Pumped out)
Homework Answers
Answer:
The Na+/K+-ATPase enzyme helps cells maintain their membrane potential. For every 3 sodium ions that are Pumped out, 2 potassium ions are Pumped in.
Explanation:
Mechanism of sodium potassium pump
- The pump, after binding ATP, binds 3 intracellular Na+
ions.
- ATP is hydrolyzed, leading to phosphorylation of the pump at a
highly conserved aspartate residue and subsequent release of
ADP.
- A conformational change in the pump that exposes the Na+ ions to the outside. The phosphorylated form of the pump has a low affinity for Na+ ions, so they are released.
- The pump then binds 2 extracellular K+ ions. This causes the dephosphorylation of the pump, reverting it to its previous conformational state, transporting the K+ ions into the cell.
- The unphosphorylated form of the pump has a higher affinity for Na+ ions than K+ ions, so the two bound K+ ions are released. ATP binds, and the process starts again
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8) The Na+/K+-ATPase enzyme helps cells maintain their membrane
potential. For every (1/2/3/4) sodium ions that...
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Na^+/K^+ ATPase (sodium potassum adenosine triphosphatase) is found in the plasma membrane and catalyzes the exchange of sodium and potassium ions across the membrane. Sort the following statements about the transport system as either true or false.
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of...
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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 th...
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All mammalian cells maintain the resting membrane potential across the plasma membrane. Neurons and muscle cells...
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The sodium potassium uses energy in the form of ATP hydrolysis to move 3 sodium ions...
The sodium potassium uses energy in the form of ATP hydrolysis
to move 3 sodium ions out of the cell and 2 potassium ions into the
cell. The concentration of sodium inside is 14mM and outside is
143mM. The concentration of potassium inside is 157mM and outside
is 4mM. Membrane potential is -50mV and temperature is 310K.
Demonstrate that hydrolysis of ATP to ADP provides enough energy to
move 3 sodium ions out and 2 potassium ions in to the...
QUESTION 5 Animal cells have a negative membrane potential; why is this O A. All of...
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Na^+/K^+ ATPase (sodium potassum adenosine triphosphatase) is found in the plasma membrane and catalyzes the exchange of sodium and potassium ions across the membrane. Sort the following statements about the transport system as either true or false.
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
Roles of the Na+/ K+ pump 1. Maintain the Nat/K+ concentration gradicnt across the plasma membrane. (That's obvious) 2. It plays a role in maintaining the resting membrane potential. Why? 3. The steep electrochemical gradient of Na+ is used in "coupled active transport" (coupled pumps). If the Nat/K+ pump stops, then these Na+ coupled transport mechanisms will also eventually stop. Explain The apical surface of the epithelial cells that line the lumen of the gut contains a symport that used...
HUIUU PUIS Cali) 1. Sodium-potassium pump helps nerve cells establish a voltage across their membranes. Explain how these ions are transported across the membrane and how this contributes to membrane potential. What is the role of ATP in this process?
All mammalian cells maintain the resting membrane potential across the plasma membrane. Neurons and muscle cells are capable of generating the action potential to communicate with each other. Below is a diagram showing a temporal change of the membrane potential in axon. Explain how such membrane potential is generated and/or maintained in each stage (1-3). Make sure to identify key membrane proteins and the movement of ion(s) through these membrane proteins in each stage. Calculate the membrane potential at the...
The sodium potassium uses energy in the form of ATP hydrolysis
to move 3 sodium ions out of the cell and 2 potassium ions into the
cell. The concentration of sodium inside is 14mM and outside is
143mM. The concentration of potassium inside is 157mM and outside
is 4mM. Membrane potential is -50mV and temperature is 310K.
Demonstrate that hydrolysis of ATP to ADP provides enough energy to
move 3 sodium ions out and 2 potassium ions in to the...
QUESTION 5 Animal cells have a negative membrane potential; why is this O A. All of these answers are correct B. Respiration produces an abundance of acidic metabolites. C. None of these answers are correct OD. Proton pumps in the plasma membrane pump H+ out of the cell. O E. Sodium-potassium pumps export more Na+ than they import K+ into the cell.
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