If you cut bundles of axons and their myelin sheaths in the PNS, you cut
A. ganglia.
B. nuclei.
C. nerves.
D. gray matter.
E. nerve tracts.
C
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Local hyperpolarization in a synapse is called a/an ________.
A. resting membrane potential B. action potential C. excitatory postsynaptic potential D. gap junction potential E. inhibitory postsynaptic potential
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.
Pyruvate dehydrogenase is a multienzyme complex that brings together a molecule of pyruvate and a molecule of coenzyme A.
Answer the following statement true (T) or false (F)
What is the major histocompatibility complex (MHC)?
A) The major histocompatibility complex is a collection of circulating proteins that bind pathogens and enhance phagocytosis. B) The major histocompatibility complex is a cell membrane barrier that blocks pathogens from entering cells if the MHC barrier is expressed. C) The major histocompatibility complex is the term for the coordinated antibody-mediated response to a pathogen. D) The major histocompatibility complex is a portion of chromosome 12 that contains genes that control the production of anti-viral proteins by normal cells. E) The major histocompatibility complex is a portion of chromosome 6 that contains genes that control the synthesis of membrane glycoproteins.