Open Circulatory System Definition In an open circulatory system, the blood suffuses the body instead of being sealed tight in arteries and veins, and may be directly exposed to the environment. Hemolymph is used instead of blood in open circulatory systems. In animals with closed circulatory systems, hemolymph performs the functions of blood, lymph, and … Read more

The human nervous system is a sprawling network of nerves and cells which, together, regulate all of the vital functions that take place in our bodies. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PSNS) are both components of the autonomic nervous system (ANS). Together, they regulate the involuntary and reflexive functions of … Read more

The cell body (also known as the soma) is the spherical part of the neuron that houses the nucleus. Additionally, it contains all the other organelles essential to cell survival and provides the axon with energy, proteins, and other materials. What is the Cell Body? The cell body (AKA the soma) is one of the … Read more

Monophyletic Definition Monophyletic, or monophylogeny, is a term used to describe a group of organisms that are classified in the same taxon and share a most common recent ancestor. A monophyletic group includes all descendants of that most common recent ancestor. The word “mono-phylo-geny” literally translates from Greek into “one-tribe-origin.” A monophyletic taxon is also … Read more