BIO 152 E3 EER

What is a voltage-gated channel?

• A channel that responds to a change in pressure

• A channel that responds to a change in electrical potential across a membrane

• A channel that responds because of a molecule

• A channel that responds to a chemical gradient

What is the resting membrane potential of a typical neuron?

• -70mV

• -55mV

• 0mV

• +30mV

What happens when threshold is reached?

• The membrane potential goes down to -80mV

• Voltage-gated calcium channels open

• An action potential occurs

• Nothing happens

What is the correct order of events in action potentials?

• Hyperpolarization, repolarization, depolarization

• Repolarization, depolarization, hyperpolarizatin

• Hyperpolarization, depolarization, repolarization

• Depolarization, repolarization, hyperpolarization

This type of channel responds to a change in the electrical potential of the cell membrane

• leaky
• voltage gated
• mechanically gated

Which membrane protein(s) establish and maintain RMP?

• Na+/K+ pump

• K+ leak channels

• Na+ leak channels

• All of the above

Tags

NGSS.HS-LS1-3

When threshold is reached, what happens in terms of channels?

• VG Na+ channels open

• VG K+ open

• The Na+/K+ pump increases its activity

• More than one of the options is correct

Which of the following is false regarding skeletal muscle?

• It is striated

• Fibers have a single nucleus

• It is multinucleated

• None of the above

Which of the following is false regarding cardiac muscle?

• Fibers are shorter and tapered at each end

• Found in the walls of the heart

• Is striated

• Is branched

Which of the following is true regarding smooth muscle?

• It is striated

• It is typically found wrapped around internal tubes

• They are typically found in blood vessels

• More than one of the options is correct