The magnitude of an action potential ____ as it is propagated down an excitable membrane due to the ____ principle
a. increases; all-or-nothing principle
b. remains constant; all-or-nothing principle
c. increases; threshold principle
d. remains constant; threshold principle
ANSWER: b
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A lizard's bobbing dewlap (a colorful flap of skin hanging from an Anolis lizard's throat) is an example of a(n) _____
A) stimulus B) reflex C) signal D) innate releasing mechanism E) structure necessary for respiration
The temperature at which an alligator's egg is incubated will determine the sex of the offspring. The dependent and the independent variables in this experiment are ________.
Fill in the blank(s) with the appropriate word(s).
What is the simplest method to measure population density in a given area?
A. Count the number of organisms. B. Perform a line transect. C. Look for random dispersion patterns. D. Count the number of reproductive adults. E. Calculate a survivorship curve.
The blood works with the muscular system by
a. destroying toxins. b. sensing movement. c. carrying heat produced by muscles. d. controlling blood pressure. e. carrying nutrients.