Norepinephrine binding to alpha receptors on vascular smooth muscle causes ________ and epinephrine binding to alpha receptors on vascular smooth muscle causes ________.
Fill in the blank(s) with the appropriate word(s).
vasoconstriction, vasoconstriction
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When carbon dioxide bonds to hemoglobin, the compound ________ forms.
Fill in the blank(s) with the appropriate word(s).
There are two types of synapses, based on mode of communication. What are they?
A. Mechanical and chemical B. Magnetic and physical C. Physical and chemical D. Chemical and electrical E. Mechanical and electrical
An electrical impulse starting at the SA node passes through the conducting-system structures in the following order _______.
A. bundle of His>AV node>Purkinje fibers B. AV node>Purkinje fibers>bundle of His C. Purkinje fibers>AV node>bundle of His D. AV node>bundle of His>Purkinje fibers
Under which of the following conditions do cell volumes not change and the osmolarity in both extracellular and intracellular fluids remain the same?
A) hypovolemia B) osmotic equilibrium C) hypervolemia D) hypotonicity E) hypertonicity