During mammalian labor and delivery, the contraction of uterine muscles is enhanced by oxytocin. This is an example of _____
A) a negative feedback system
B) a hormone that acts in an antagonistic way with another hormone
C) a hormone that is involved in a positive feedback loop
D) signal transduction immediately changing gene expression in its target cells
C
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Which type of receptor undergoes a conformational change upon activation? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
Flukes are most closely related to _____
a. tapeworms c. arthropods b. roundworms d. echinoderms
Which of the following molecules is least likely to be able to pass through a capillary wall?
A) an enzyme B) a sodium ion C) glucose D) oxygen
When do opportunistic pathogens tend to cause disease?
A) when the host is young B) when the host didn't wash with soap C) when the host is weakened D) after the host is already infected with a different pathogen E) when the host is old