Exam 44: Neurons, Glia, and Nervous Systems

If the clearance of neurotransmitter from the synaptic cleft is prevented, which of the following will be the most likely result?

Refer to the figure showing a neuromuscular junction. Which cellular event is paired correctly with the location where it occurs?

If the proteins that anchor acetylcholine-containing vesicles to the presynaptic membrane are damaged by botulism toxins, what effect will this have on the neuromuscular junction?

Oligodendrocytes have a function in the central nervous system similar to that of Schwann cells in the peripheral nervous system.The main function of oligodendrocytes and Schwann cells is to

Which statement concerning the nodes of Ranvier is true?

Which experimental stimulus would most likely produce the greatest response in a postsynaptic neuronal membrane?

When an action potential arrives at the axon terminal, the voltage-gated calcium channels at the terminal

Disabling the sodium-potassium pump would cause ion concentration differences across the cell membrane to _______.

Jawless vertebrates-hagfishes and lampreys-lack myelin.From this you might deduce that

The knee-jerk reflex is an example of

In humans, the region of the brain that is the largest and that is more complex than that of most other vertebrate species is the

If a physical or chemical stimulus causes a change in a cell's membrane potential, a direct effect of that change may be

Some neurotoxins selectively destroy the axon terminals of neurons.What would be the result of such destruction?

The Nernst and Goldman equations shown are used to predict membrane potentials. Which equation is more likely to be accurate in predicting the resting membrane potential, and why?

Neurons may vary widely in appearance but are all similar in that they

When you read this question and eventually mark an answer, your neurons busily send information to and from your brain and compare it against what you learned in class.Integration of these processes is supplied by

When gated channels open or close the membrane potential of the cell changes.When the inside of a neuron becomes less negative because of the influx of Na⁺ ions, the membrane

When you decide to mark a particular answer to this question, your nervous system sends the command to your hand to do so.That command is carried to your hand by

In the neuromuscular junction, the response of the motor end plate to the release of acetylcholine is to open cation channels.Cations then enter the muscle cell, resulting in

Astrocytes participate in thousands of synapses with neurons.Their presence can influence activity in a postsynaptic neuron by