Organisms with a circulating body fluid that is distinct from the fluid that directly surrounds the body's cells are likely to have ________.
A) an open circulatory system
B) a closed circulatory system
C) a gastrovascular cavity
D) branched tracheae

Question

Quizplus · Accepted Answer

Organisms with a closed circulatory system have a blood-like fluid (usually called hemolymph) that circulates within vessels and is distinct from the extracellular fluid that directly surrounds the body's cells. This is in contrast to organisms with an open circulatory system, where the circulatory fluid directly bathes the body's tissues. Organisms with a gastrovascular cavity have a single opening that serves as both the mouth and the anus and allows for simple diffusion of nutrients and waste. Branched tracheae are a characteristic of insects, which have a respiratory system that involves the diffusion of gases through branching tubules called tracheae.

Organisms with a Circulating Body Fluid That Is Distinct from the Fluid