Muscle Physiology 3: Sodium-Potassium Pump

The video explains the sodium potassium pump, also known as sodium potassium ATPase, which pumps sodium and potassium ions across cell membranes. It details the enzymatic role of ATPase in hydrolyzing ATP to ADP and phosphate, and describes the pump's function in muscle and neuron physiology. The mechanism involves moving sodium ions out and potassium ions into the cell, driven by ATP hydrolysis. The pump's cycle is crucial for maintaining ion balance and enabling action potentials.

What is another name for the sodium-potassium pump?

• Sodium-Potassium Transporter

• Sodium-Potassium Enzyme

• Sodium-Potassium Channel

• Sodium-Potassium ATPase

What is the primary function of an ATPase enzyme?

• To bind sodium and potassium ions

• To transport ions across membranes

• To hydrolyze ATP into ADP and inorganic phosphate

• To synthesize ATP

In the sodium-potassium pump, how many sodium ions are moved out of the cell?

• One

• Two

• Three

• Four

How many potassium ions are moved into the cell by the sodium-potassium pump?

• Four

• Three

• Two

• One

What triggers the change in conformation of the sodium-potassium pump?

• Release of ADP

• Binding of potassium ions

• Hydrolysis of ATP

• Binding of sodium ions

What is the role of aspartate in the sodium-potassium pump mechanism?

• It binds sodium ions

• It cleaves ATP

• It binds potassium ions

• It changes the pump's conformation

Why is the sodium-potassium pump considered a catalyst?

• It speeds up the reaction

• It changes the conformation of proteins

• It is regenerated at the end of the cycle

• It binds to ATP