In order to increase contractility, NE released form sympathetic fibers would act at synapses with _______
a. SA node cells
b. AV node cells
c. ventricular contractile cells
d. atrial contractile cell
Answer: c. ventricular contractile cells
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The __________ distance is the effective diffusion distance for oxygen from the capillary into the surrounding tissue
Fill in the blank with the correct word.
Damage to which tunic of the GI tract would directly affect Auerbach's plexus?
A. Muscularis B. Mucosa C. Serosa D. Submucosa
Leukopenia ________
A) may result from bone marrow cancer, or from living at high altitudes B) is characterized by uncontrolled proliferation of abnormal WBCs C) may indicate a disease such as cirrhosis of the liver or tuberculosis D) is characterized by an abnormally high WBC count
Cardiac muscle cells in the atria are capable of contracting spontaneously because of a spontaneous depolarization resulting from:
A. an inward current through a hyperpolarization activated channel B. cyclic changes in the activity of the Na+,K+-ATPase C. slow leak of Ca++ through the dihydropyridine receptor D. cyclic changes in the activity of the sarcolemmal Ca++ pump E. cyclic changes in the activity of SERCA