Which of the following statements is NOT true?
a. Cnidarians circulate fluid in the coelenteron.
b. The differences between an open and a closed circulatory system are clear-cut.
c. Many animals have an internal extracellular fluid that is separate from the environment.
d. The fluid leaving the capillary bed of closed circulatory systems is similar to the hemolymph of open systems.
e. Closed circulatory systems are made necessary by the large size of organisms that have them and the large distances between nutrient sources and cells.
B
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Absence of postural muscle tone is descriptive of or occurs during
A. paradoxical sleep. B. slow-wave sleep. C. neither slow-wave sleep nor paradoxical sleep. D. both slow-wave sleep and paradoxical sleep.
Which of the following structures is visible to the naked eye?
A. Lingual papilla B. Taste (gustatory) cell C. Taste hair D. Taste bud E. Taste pore
How many bones make up the skull? (Note: Be sure your answer is a numeral, e.g. "5" vs "five").
Fill in the blank(s) with the appropriate word(s).
The junction of a neuron with another cell is a/an
A. synapse. B. ganglion. C. receptor. D. effector.