Significance to humans

There is no direct significance between humans and chaetognaths. However, chaetognataha are an important part of the marine food chain, and they are used as indicators to determine the level of water from the Atlantic Ocean moving into the North Sea. Arrow worms may play a role in the oceanic distribution of tetradotoxin-producing bacteria.

Spadella Cephaloptera

1. Pterosagitta draco, 2. Sagitta enflata, S. Spadella cephaloptera, 4. Eukrohnia fowleri, B. Sagitta setosa, B. Sagitta bipunctata, l. Sagitta planc-tonis. (Illustration by Joseph E. Trumpey)

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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