Which one of the following hormone pairs is antagonistic, in that they have opposing effects?
A) estrogen, progesterone
B) epinephrine, norepinephrine
C) glucagon, insulin
D) oxytocin, prolactin
E) thyroxine (T4 ) and triiodothyronine (T3 )
C
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A ________ is a hollow tubelike structure that surrounds a chain of cells.
Fill in the blank(s) with the appropriate word(s).
Instinctive behaviors are distinguished from learned behaviors because instinctive behaviors are ____
while learned behaviors are ____.
a. genetically programmed responses; dependent upon experience b. dependent upon experience; genetically programmed responses c. acquired from observation; acquired from practice d. incomplete the first few times they are displayed; apparently a product of reason e. taught by parents; acquired from trial and error
Phosphorus is typically in short supply in aquatic and terrestrial ecosystems
Indicate whether the statement is true or false
One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered?
A. paracrine B. autocrine C. endocrine D. direct contact E. synaptic