Circulatory Systems Compensate for ________

question 21

Multiple Choice

Circulatory systems compensate for ________.

• A) temperature differences between the lungs and the active tissue
• B) the slow rate at which diffusion occurs over large distances
• C) the problem of communication systems involving only the nervous system
• D) the need to cushion animals from trauma

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Definitions:

Alveolates

Protists that have alveoli, flattened vesicles located just inside the plasma membrane; include the dinoflagellates, apicomplexans, and ciliates. See chromalveolates; compare with stramenopiles.

Contractile Vacuoles

Organelles found in certain unicellular organisms responsible for expelling excess water from the cell to maintain osmotic balance.

Flattened Vesicles

Flattened, membrane-bound sacs found within cells, often involved in the transport and processing of cellular materials.

Chromalveolates

A supergroup composed of diverse protists with few shared characters; most are photosynthetic, and heterotrophic chromalveolates, such as the water molds and ciliates, probably descended from autotrophic ancestors. Divided into two main groups; see alveolates and stramenopiles.