Exam 48: Electrical Signals in Animals

Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium/potassium channel and opens it. This is an example of ________.

Why are action potentials conducted usually in one direction along an axon?

If you experimentally increase the concentration of K+ inside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential?

What do we call a membrane potential in which there is no net movement of an ion across a membrane?

Which of these ions is more abundant in the interior of a resting neuron than in the fluid surrounding the neuron?

After the depolarization phase of an action potential, the resting potential is restored by ________.

Where are neurotransmitter receptors located?

Which answer explains why Na+ ions enter the cell when voltage-gated Na+ channels are opened in neurons?

A nerve is a collection of ________.

A researcher uses the chemical inhibitor cyanide to reduce ATP production in a neuron. What would be one effect of preventing ATP production?

Which of the following will induce a graded hyperpolarization of a membrane under normal resting conditions?

Pyrethroid insecticides prevent the voltage-gated sodium channels of insects from inactivating. Neurons that were exposed to pyrethroids would ________.

If you experimentally increase the concentration of Na+ outside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential?

At a neuromuscular junction, what process releases acetylcholine into the synaptic cleft?

Which of the following explains why one-way synaptic transmission occurs?

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's permeability to sodium ions is greatest?

Which of the following is expected in a neuron that is receiving input through tens of thousands of synapses?

Which of the following is an amino acid that functions as a neurotransmitter at most inhibitory synapses in the brain?

Which of the following statements about action potentials is correct?

The activity of the sodium-potassium pump results in the movement of which ions across the plasma membrane?