Chapter 3 neuroscience quiz

Place the following events of an action potential in order

1. The membrane potential reaches threshold at the axon hillock/ axon initial segment 2. Voltage gated sodium (Na+) channels open 3. Sodium (Na+) ions flow from outside to inside and depolarize the axon membrane 4. Voltage gated potassium channels open 5. Potassium (K+) ions flow from inside to outside and repolarize the axon membrane

Match the brain lobe with it's function.

A) temporal lobe = hearing and language comperhension B) frontal lobe = planning and decision making C) occipital lobe = visual processing (primary visual cortex) D) parietal lobe = sensory perception of touch

What is the peripheral nervous system comprised of?

Cranial nerves and spinal nerves

When an excitatory neurotransmitter is released at a synapse, it always causes an action potential in the postsynaptic neuron. True or false?

False

When ion channels open, which direction do ions flow?

From an area of high concentration to low concentration

After a stroke, a patient experiences weakness and trouble moving on their right side. The stroke likely occurred in what region of the brain?

Left cerebral hemisphere

A patient has an impaired (pinched) L5 nerve, which exists the spinal cord in the lumbar (lower back) region. What is a possible symptom they may experience?

Loss of sensation or "pins and needles" feeling in a defined region of skin on the foot and lower leg

Match the term with the best description

Membrane potential = produced by the difference in charge across the membrane, measured in voltage Current = the flow of ions from one place to another Polarized = the state of having a separation of charge/ ions Depolarize = having less of a separation in charge/ions Permeability = the ability of membrane to allow ions to flow from one side to another

Which of the following ions has a concentration greater on the inside of neurons than on the outside?

Potassium (K+)

You encounter an angry looking bear while walking in the woods. Your heart rate increases. You begin to breathe quickly and your pupils dilate. What is responsible for producing these physiological changes?

The sympathetic division of the autonomic nervous system