Which of the following describes a lophophore, which is a feature possessed by all members of the phyla Ectoprocta, Brachipoda, and Phoronida?
a. a rounded fold with one or two rows of hollow, ciliated tentacles
b. an outpocket of the digestive tract, where metabolic wastes are processed before emptying into the digestive tract for expulsion
c. a cluster of pores along the aboral surface, used for expelling wastes from the digestive tract
d. an extra body cavity surrounding the digestive tract, filled with muscles used for locomotion
Ans: a. a rounded fold with one or two rows of hollow, ciliated tentacles
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a. insulating the axons with myelin sheath cells b. increasing the number of pumps c. increasing the number of sodium gates d. making axon terminals larger
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