Answer the following statement(s) true (T) or false (F)
1. a muscle can generate more force during contraction if it has been pre-stretched
2. all muscles in the human body cross only one joint
3. a motor unit consists of a group of muscles that are innervated by the same motor neuron
4. if a second stimulus occurs in a motor unit before the first twitch has subsided, the muscle will not respond to the second stimulus
5. Ca ions that are released into the area surrounding the myofibrils promote cross bridge formation
1. False
2. False
3. False
4. False
5. False
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Frogs "croak" at night to allure females for mating. Females are attracted only to the song of their species. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
The four macromolecules making up our cells allow for the same structure and function across all cells in the body
a. True b. False
Genetic drift may lead to
A) loss of genetic variation in a population. B) a decrease in the mutation rate of a particular gene. C) increased heterozygosity at many loci. D) Hardy-Weinberg equilibrium. E) All of these
A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?
A) The solution in the beaker is hypertonic relative to the solution in the balloon. B) The solution in the balloon is isotonic; the solution in the beaker is hypertonic. C) The solution in the balloon is hypotonic relative to the solution in the beaker. D) The solution in the balloon is hypertonic relative to the solution in the beaker.