Examlex
A _________ is an automatic,involuntary response to an incoming stimulus.
Open Circulatory System
A type of circulatory system where blood is not always contained within vessels but flows freely through cavities in the body.
Pumping Organ
This usually refers to the heart, an organ responsible for circulating blood throughout the body by rhythmic contraction and dilation.
Arteries
Blood vessels that carry oxygen-rich blood away from the heart to all parts of the body.
Veins
Blood vessels that carry blood towards the heart from various parts of the body.
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