Excitable Cell - Nerve

Which of the following determines the membrane potential?

• Difference btwn concentration and charges of ions inside vs outside cell

• High [K+] outside the cell

• High [Cl-] within the cell

• Equal distribution of (+) and (-) charges across membrane

Which of the following correctly represents the relative ionic concentration in the ICF vs ECF?

• ICF [Cl-] > ECF [Cl-

• ICF [K+] < ECF [K+]

• ICF [Mg2+] < ECF [Mg2+]

• ICF [Na+] < ECF [Na+]

Which of the following is a correct pairing of zone-function of a neuron?

• Input zone - Axon terminal

• Conducting zone - Dendrites

• Trigger zone - Axon hillock

• Output zone - Receptors

Which of the following is the main contributor to the resting membrane potential of a neuron?

• K⁺ leak channels

• Na⁺-K⁺ ATPase pump

• Na⁺ leak channels

• Cl^- channels

Which of the following potential cannot undergo summation?

• Action Potential

• Excitatory Postsynaptic Potential (EPSP)

• Inhibitory Postsynaptic Potential (IPSP)

• End Plate Potential

Which of the following is a specific characteristic of an action potential?

• Amplitude varies with stimulus strength

• Has both absolute and relative refractive period

• Triggered by ligands

• Undergoes decremental conduction

A motor neuron is usually a

• Unipolar neuron

• Bipolar neuron

• Tripolar neuron

• Multipolar neuron

Which of the following cells is responsible for the formation of myelin sheath in neurons within the CNS?

• Microglia

• Oligodendrocytes

• Ependymal cells

• Schwann cells