Exam 48: Electrical Signals in Animals

Which of the following describes the ion channels of a resting neuron?

Neurotransmitters categorized as inhibitory are expected to ________.

In multiple sclerosis, the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. How does multiple sclerosis manifest at the level of the action potential?

Which of the following would most likely occur if you experimentally depolarize the middle of an axon to threshold using an electronic probe?

In which of the following locations would we expect to find the release of neurotransmitter molecules?

What would most likely happen if twice as many inhibitory postsynaptic potentials (IPSPs) as excitatory postsynaptic potentials (EPSPs) arrive in close proximity at a postsynaptic neuron?

If you treat a neuron with a drug that increases membrane permeability to Na+, how would you expect the equilibrium potential for Na+ to change?

Which of the following will decrease the heart rate of a vertebrate?

Excitatory postsynaptic potentials (EPSPs) occurring at multiple synapses on the same postsynaptic neuron can add together through ________.

You feel something touch your arm, think it might be a fly, and you extend your arm to scare it away. In which order is the information about the touch processed?

What type of neurons is responsible for the interpretation of sensory input?

In a chemical synapse, where would we find an ionotropic receptor?

For a neuron with an initial membrane potential at -70 mV, what would be the result of an increase in the movement of potassium ions out of that neuron's cytoplasm?

Conduction and refractory periods are typical of ________.

Which of the following best explains the observation that a resting neuron membrane, while highly permeable to potassium ions, is not at the equilibrium potential for potassium?

Refer to the following graph of an action potential to answer the question. Which Roman numeral in the graph indicates the point when the membrane potential is closest to the equilibrium potential for potassium?

Refer to the following graph of an action potential to answer the question. Which Roman numeral in the graph indicates when the neuronal membrane is at its resting potential?

Which of the following would produce the fastest possible conduction velocity of action potentials?

Action potentials move along axons ________.

Which of the following describes the cause of the undershoot phase of hyperpolarization?