Science quiz

What is the role of the neuron's cell membrane in neural communication?

• It amplifies the electrical signal

• It acts as a resistor

• It separates the ions inside and outside the cell

• It generates energy for ion movement

What is the primary purpose of the resting membrane potential?

• Transmitting signals

• Keeping the neuron at rest

• Generating energy

• Repelling ions

What is the unit for measuring membrane potentials?

• amperes

• volts

• watts

• millivolts

Which of the following is a passive transport mechanism?

• Sodium-potassium pump

• Diffusion of ions due to concentration gradient

• ATP breakdown

• Phosphorylation

What primarily determines a neuron's resting potential?

• Soldium ions

• Chloride ions

• Potassium ions

• Calcium ions

What type of ion channel opens due to changes in voltage?

• Chemical-gated

• Voltage-gated

• Temperature-gated

• Pressure-gated

What triggers ligand-gated channels to open?

• Voltage changes

• Binding of a specific molecule

• Mechanical force

• All of the above

Which of the following forces is important in passive transport?

• Magnetic force

• Electrical charge

• Centrifugal force

• Nuclear force

What would happen to ions in an area of high concentration?

• They will tend to move to an area of lower concentration.

• They will stay where they are.

• They will move to an area of higher concentration.

• They will disappear.

What is a concentration gradient?

• A molecule that triggers ion channels

• A measurement of how concentration changes from one region to another

• The difference in electrical charge across a membrane

• A subtype of ion channel