The number of distinct cell types in the human body is about twenty
Indicate whether the statement is true or false.
FALSE
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This figure shows the major cavities within the skull. Which number indicates the frontal sinus?
A. 1 B. 2 C. 3 D. 4 E. The frontal sinus is not shown on this figure.
Which of the following describes the cells of single-unit visceral muscle?
A) They contract all at once. B) They are chemically coupled to one another by gap junctions. C) They exhibit spontaneous action potentials. D) They consist of muscle fibers that are structurally independent of each other.
The cardioinhibitory center controls activities of the ________ motor neurons.
A) ganglionic B) parasympathetic C) postganglionic D) preganglionic E) sympathetic
In a neuron, the nucleus and Nissl bodies are located in the
A) axon. B) dendrites. C) neuron cell body. D) terminal boutons. E) collateral axons.