Why can an infection in the brain's ventricles usually be detected in spinal fluid obtained from the lower back (lumbar region)?
A. Cerebrospinal fluid (CSF) originates in the ventricles, but percolates over and around the brain and spinal cord.
B. There is a high degree of vascularity that exists, allowing easy transfer of bacteria in the cerebrospinal fluid (CSF) and the blood.
C. There is a set of lymph nodes specifically in place to drain the cerebrospinal fluid (CSF) from the ventricles. They are housed in the lumbar region of the spinal column, adjacent to the spinal cord.
D. This is an incorrect statement. Since the central nervous system (CNS) is a protected site due to the blood-brain barrier, there can never BE an infection in the ventricles.
A.
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Which of the following is false with regard to the extracellular matrix?
A) These structures are external to the cell membrane, but are still an integral component of cell function. B) Extracellular matrices are only found in association with eukaryotic cells. C) Extracellular matrices play a role in determining the shape of a cell. D) Bone and cartilage are examples of cells that have specialized extracellular matrices associated with their function. E) Extracellular matrices play a role in determining the mechanical properties of tissues and organs.
What information would best help you distinguish what type of sensation a sensory neuron transmits?
A. the rate of action potential firing B. the proteins it expresses most abundantly C. the part of the brain it transmits signals to D. the amplitude of action potentials E. the diameter of the axon Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about sensory neurons? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Circulation in the accompanying diagram functions primarily as a(n) ____
a. an open circulatory system b. system consisting of mostly of tissue spaces c. closed circulatory system d. interstitial fluid system e. three-directional system
Which of the following produces antibiotics?
a) B-cells b) Orthomxyovirus c) Plasma cells d) Pseudomonas aeruginosa