BIOL 2312 Chapter Notes - Chapter 42.1-42.2: Abdominopelvic Cavity, Pericardium, Thoracic Cavity
11 Jan 2017
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Chapter 42. 1-42. 2: the animal body and principles of. The 4 levels of organization: cells, tissues, organs, organ systems. Cells: considered to be fundamental units of life. Anywhere between 50 and a few hundred cells can comprise a vertebrate body. Tissues are groups of cells of a single type and function: Tissues: groups of cells with similar structure and function. Early on in development embryonic tissues are differentiated into germ layers. 4 principal tissues (primary tissues) in adult vertebrates: Organs: groups of various tissues that work to form a functional and structural unit. Organ system: group of organs that work to perform specialized functions of the body. The general body plan of vertebrates is a tube within a tube with internal support: The inner tube is the digestive tract-- mouth to anus. The outer tube is the vertebrate body and garners support from the internal skeleton. Vertebrates have both dorsal and ventral body cavities: book notes page 1.
