Exam 28: Nervous Systems

Oligodendrocytes are cells in the brain that produce myelin in the central nervous system. Myelin regulatory factor (MyRF) is a transcription factor that is required by oligodendrocytes in order to produce myelin. Researchers investigated the importance of MyRF by having mice learn how to run on complex wheels (there were many gaps in the wheel thus making it difficult to run on-see graph below). -Researchers created a genetic strain of mice that were lacking both genes for MyRF. What is the most likely effect that this would have on the mice?

Natural selection tends to correlate the structures of a nervous system with an animal's function within the environment. A good example is sessile or slow-moving molluscs such as clams, which

The signal that crosses a synapse is stopped when the

What would happen if a drug that acted to block all potassium channels were introduced to a neuron?

Which statement about this figure is true?

One of the most important branch points in the evolution of animals and their nervous systems was the appearance of

Which part of this diagram of a neuron depicts the axon?

The speed of impulse conduction along an axon may be increased by

The human cerebral cortex accounts for what percentage of the total mass of the brain?

The simplest animals to display cephalization and centralization of the nervous system are

Oligodendrocytes are cells in the brain that produce myelin in the central nervous system. Myelin regulatory factor (MyRF) is a transcription factor that is required by oligodendrocytes in order to produce myelin. Researchers investigated the importance of MyRF by having mice learn how to run on complex wheels (there were many gaps in the wheel thus making it difficult to run on-see graph below). -Mice that lacked the MyRF genes (P-MyRF (−/−)) and mice that had functional MyRF genes (P-MyRF (+/−)) ran on the complex wheel and their speed was recorded (see accompanying figure). What group of mice learned how to run on the complex wheel more easily?

Which brain region controls the secretion of pituitary hormones and exerts direct control over many other aspects of homeostasis?

The two major anatomical divisions of the nervous system are the

Parkinson's disease is associated with a deficiency in

One neurotransmitter associated with sleep, mood, attention, and learning is

Excitatory neurotransmitters are most like what part of an automobile?

During REM sleep, an EEG shows

Which results from stimulation by the sympathetic nervous system?

Nervous system effector cells

Botulinum toxin (Botox) produced by certain bacteria will