Describe the organization of the muscles of the mantle of a squid and the mechanism of jet propulsion
What will be an ideal response?
Answer: The muscles of the outer body wall are intermingled in two planes: radial muscle fibers extend from the inside to the outside and three layers of circular muscles comprise the circumference. When the muscles relax, the volume of the mantle cavity increases and water enters. Contraction of the muscles decreases the volume of the cavity and water is forced out through the siphon generating jet propulsion.
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Which best describes temporal summation?
A. It only refers to addition of EPSPs. B. A synapse is stimulated a second time before the effect of a first stimulus at the synapse has terminated. C. The size of an EPSP depends on the size of the stimulus. D. It always brings a postsynaptic cell to threshold. E. Two synapses on different regions of a cell are stimulated at the same time.
In terms of reproduction, which group of mammals is most similar to their reptilian ancestors?
A) Monotremes B) Marsupials C) Placental mammals D) Flying mammals
The procedure in which density is determined by tapping a body surface with the finger is ____________
Fill in the blank(s) with correct word
Match the cell structure with the product that it produces: nucleolus
A)Cilia and flagella (microtubules) B)Ribosomes C)ATP D)Transport vesicles E)Lysosomes and secretory vesicles