Draw a diagram of a typical neuron, label its parts, and list the function of each labeled structure. What will be an ideal response?
The diagram and its labels should resemble Fig. 41-2. The functions are as follows:
* dendrites: receive stimuli and generates a neural impulse
* cell body: receives signal form the dendrites
* axon: conducts neural impulses (often via branches called axon collaterals) away from the
cell body
* myelin sheath: insulates axons (note: the myelin sheath is a membrane extension of other
cell types: Schwann cells or oligodendrocytes)
* nodes of Ranvier: gaps between myelin sheaths
* synaptic terminals: release neurotransmitters into the synaptic cleft
You might also like to view...
Which of the following traits appeared at point 4 on the the phylogeny above?
A. bulk transport B. gap junctions C. cell signaling D. adhesion E. differentiation of distinct cell types
The biological diversity encountered increases as one moves from the poles to the tropics. Within a particular latitude, diversity also varies:
A) between different continents B) between different habitats C) as a function of temperature and precipitation D) as a function of topographic complexity E) all of the above
A scientist wants to examine living cells lining the respiratory tract to determine how the cells use tiny hairs to move dirt and mucus away from the lungs. Which of the following instruments would be best, and why?
A) a light microscope, because it allows observations of whole, live cells B) a transmission electron microscope, because it has high resolution C) a scanning electron microscope, because it can reveal structures on cell surfaces D) a scanning electron microscope, because it can be used to observe whole cells without slicing them
An epidemiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. The scientist wants to try to isolate the bacteria in the lab. What culture conditions are most likely to be
successful? A) culturing on blood agar plates B) inoculation of EMB plates C) incubation in an anaerobic culture system D) inoculation of cell cultures E) inoculation of a minimal medium broth