Answer the following statements true (T) or false (F)
1. If the GFR is too low, needed substances may pass so quickly through the renal tubules that they are not absorbed and instead are lost in the urine.
2. In the kidneys, the countercurrent mechanism involves the interaction between the flow of filtrate through the loop of Henle of the juxtamedullary nephrons (the countercurrent multiplier) and the flow of blood through the limbs of adjacent blood vessels (the countercurrent exchanger). This relationship establishes and maintains an osmotic gradient extending from the cortex through the depths of the medulla that allows the kidneys to vary urine concentration dramatically.
3. The ureter transports urine from the kidney to the urinary bladder.
4. Water reabsorption through the proximal convoluted tubule is termed obligatory water reabsorption, whereas water reabsorption through the distal convoluted tubule is termed facultative water reabsorption
5. The position of the kidneys behind the peritoneal lining of the abdominal cavity is described by the term retroperitoneal.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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Hydrocephalus, or "water on the brain," may result from
A) deficient production of cerebrospinal fluid. B) excessive production of cerebrospinal fluid. C) blockage of circulation of CSF. D) excessive water intake. E) blockage of CSF circulation or excessive CSF production.
Which of the following is most closely associated with cilia?
a. actin and myosin b. intermediate filaments c. dynein and microtubules d. microfilaments and actin e. myosin motor molecules and microfilaments
The part of the ethmoid bone riddled with holes that provides passage for the olfactory nerves is the ________ plate.
Fill in the blank(s) with the appropriate word(s).
All of the following neuroglial cells are found in the CNS except which one?
A. Astrocyte B. Schwann cells C. Oligodendrocyte D. Microglia