At the synapse, synaptic vesicles are found in the
A) postsynaptic cell.
B) presynaptic cell.
C) synaptic cleft.
D) all of the above
Answer: B) presynaptic cell.
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Lymphatic capillaries
A. are open at both ends. B. lack a basement membrane. C. are like continuous capillaries in that they have many tight junctions. D. are abundant in epithelial tissues. E. are smaller in diameter than blood capillaries.
The thirst mechanism is usually not triggered until the volume of the body water has
been decreased by 5-10%. Indicate whether the statement is true or false
Nucleosidase is an enzyme that breaks the
A. bond that attaches the phosphate to the nucleoside. B. phosphodiester bond between nucleotides within DNA. C. bond between the sugar and the nitrogenous base of the nucleoside. D. bonds within the nitrogenous bases of rRNA.
For relaxation to occur,
A. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close. B. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open. C. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close. D. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.