Distribution

Ctenophores are exclusively marine and can be found in all of the world's oceans, from the poles to the equator and from the surface to as deep as 23,950 ft (7,300 m) in the ocean. It is likely that they occur even deeper, but researchers have not been able to spend much time below this depth.

The feeding methods of Pleurobrachia. 1. Hunting with tentacles fully extended; 2. When food is snared, the tentacles are retracted; 3. Cilia on ctene rows pulsate, allowing the animal to rotate; 4. Tentacle with prey is relaxed and scraped over mouth; 5. The animal reorients itself in the water column; 6. Tentacles are extended to hunt again. (Illustration by Joseph E. Trumpey)

Reproductive Biology

The feeding methods of Pleurobrachia. 1. Hunting with tentacles fully extended; 2. When food is snared, the tentacles are retracted; 3. Cilia on ctene rows pulsate, allowing the animal to rotate; 4. Tentacle with prey is relaxed and scraped over mouth; 5. The animal reorients itself in the water column; 6. Tentacles are extended to hunt again. (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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