A&P Action Potential

During repolarization, what ions are pumped out of the cell?

• Calcium

• Sodium and potassium

• Sodium

• Potassium

What reflexes stimulate skeletal muscles?

• Somatic

• Salivary

• Pupillary

• Autonomic

What are the two major functional properties of neurons?

• Connect and protect

• Contraction and movement

• Irritability and conductivity

• Cover and line surfaces

Impulse conduction is faster in neurons that are ___?

• Unmyelinated

• Cerebral

• Motor

• Myelinated

What statement best describes the resting state of a neuron?

• Neurons are polarized with more sodium ions outside the cell and more potassium ions inside the cell

• Neurons are repolarizing as potassium ions diffuse out of the cell

• Neurons are propagating the action potential

• Neurons are restoring the ionic conditions utilizing the sodium-potassium pump

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid?

• Potassium

• Magnesium

• Sodium

• Calcium

An action potential is caused by an influx of ___ ions into the cell.

• Magnesium

• Calcium

• Sodium

• Potassium

Nerve impulse transmissions that occur along myelinated neurons?

• Saltatory conduction

• Soidium-potassium pump

• All-or-none response

• Graded potential

Neurons either conduct action potentials along the length of their axons, or they remain at rest. This statement best describe which of the following phrases?

• All-or-none response

• Reflex arc

• Saltatory conduction

• Graded potential

What is the first step to the sequence of events in a nerve impulse?

• The membrane becomes depolarized

• Sodium channels open and sodium ions diffuse inward

• The membrane becomes repolarized

• Potassium channels open and potassium ions diffuse outward