Biopotential and Measurements-Module 2

Which part of the cell is responsible for controlling what enters and exits the cell?

• Nucleus

• Mitochondria

• Cell membrane

• Golgi apparatus

What is the typical resting membrane potential of a neuron?

• -70 mV

• 0 mV

• +30 mV

• -55 mV

The rapid change in membrane potential during an action potential is primarily due to the movement of which ion?

• Sodium (Na+)

• Potassium (K+)

• Chloride (Cl-)

• Calcium (Ca2+)

Bioelectric potentials are generated due to the movement of ions across which structure?

• Nucleus

• Endoplasmic reticulum

• Cell membrane

• Mitochondria

What term describes the depolarization of a membrane to trigger an action potential?

• Threshold

• Equilibrium potential

• Resting potential

• Hyperpolarization

What is the main function of ion channels during action potentials?

• Store energy

• Move large proteins

• Allow ion movement across the membrane

• Transport oxygen

Which ion primarily contributes to repolarization after an action potential?

• Sodium (Na+)

• Potassium (K+)

• Calcium (Ca2+)

• Chloride (Cl-)

What is the term for the period during which a neuron cannot generate another action potential?

• Depolarization

• Absolute refractory period

• Threshold period

• Relative refractory period

The sodium-potassium pump helps maintain the resting potential by moving:

• Sodium in and potassium out

• Potassium in and sodium out

• Both sodium and potassium in

• Both sodium and potassium out

What type of potential results in a small, localized change in membrane voltage?

• Resting potential

• Action potential

• Graded potential

• Threshold potential