Renin is a protein that is released into the bloodstream by the _________ in response to changes in __________.
A) kidneys, blood pressure
B) liver, acid-base balance
C) pancreas, insulin levels
D) hypothalamus, body temperature
Ans: A) kidneys, blood pressure
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In gymnosperms, which of the following structures or cell types would be considered spores? Select all correct choices
A. pollen precursor cells in the pollen cones B. mature pollen in the pollen cones C. seeds with the potential to germinate D. egg precursor cells in the ovule cones E. mature eggs in the ovule cones
The bright red rash and fever of scarlet fever is due to ________.
A. exfoliative toxin B. hemolysins C. erythrogenic toxin D. enterotoxins E. toxic shock syndrome toxin
This structure can grow >50 m long in kelp
a. Blade b. Holdfast c. Stipe d. Gas bladder e. Rhizoid.
Myelin is a fatty substance that
a. slows action potentials. b. is wrapped around neuroglial cells. c. increases the speed of action potentials. d. is found only surrounding neurons of the central nervous system. e. is true of a and d only.