An action potential travels down a neuronal axon. Which of the following is occurring during depolarization of the neuron?
Sodium flows out of the neuron down its electrical and chemical gradients
Sodium flows into the neuron down its electrical and chemical gradients
Sodium flows into of the cell down its electrical gradient, but against its chemical gradient
Potassium flows into the neuron down its electrical and chemical gradients
When you stare directly at an object, the image focuses on what part of the retina?
Choroid
Lens
Fovea centralis
Pupil
Optic disk