12 Questions
What is one purpose of the feathery fringe around axolotls' gills?
Enhancing sensory perception
In unicellular organisms, how do exchanges with the environment primarily occur?
Via diffusion across the plasma membrane
What is a key function of gills in animals like fish?
Increasing respiratory efficiency
Why is adaptation necessary for efficient exchange in multicellular organisms?
Because exchange through diffusion is not possible
How are internal transport and gas exchange related in most animals?
Functionally connected
What do circulatory systems in animals primarily do?
Circulate fluid throughout the body
What is the function of the gastrovascular cavity in simple animals like cnidarians?
Digestion and distribution of substances
Why can planarians and most flatworms survive without a circulatory system?
Due to having a large surface area to volume ratio
What is the main difference between open and closed circulatory systems in animals?
In open systems, there is no distinction between blood and interstitial fluid, while in closed systems, the blood is confined to vessels
Why might insects and arthropods have an open circulatory system?
To allow direct exchange of gases and nutrients with organs
How does hemolymph travel in an open circulatory system after being pumped by the heart?
Through interconnected vessels into sinuses surrounding the organs
What aids in circulating hemolymph in arthropods with an open circulatory system?
Body movements periodically squeezing sinuses
Test your knowledge on how organisms exchange materials with the environment, focusing on cellular level exchanges, specialized exchange systems like gills, and the functional relationship between internal transport and gas exchange in animals.
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