Levels of Organization/Body Cavities Flashcards
Chemical
chemical level involves interactions among atoms and their combination into molecules
Organelle
small structure contained within a cell that performs one or more specific functions
Cell
the basic functional units of life. All cells share many characteristics, but they differ in structure and function
Tissue
group of cells with similar structures and functions
Organ
is composed of two or more tissue types that together perform one or more common function
Organ system
a group of organs classified as a unit because of a common function or set of functions
Organism
any living thing considered as a whole. Organisms can have anywhere from a single cell to trillions of cells
Cavity
a fluid-filled space in the body that holds and protects internal organs
ventral cavity (front of body)
Thoracic
Abdominal
Pelvic
Thoracic Cavity
- surrounded by the rib cage
- separated from the abdominal cavity by the diaphragm
- divided into right and left halves by a structure called the mediastinum
- contains the esophagus, trachea, thymus gland, heart, and both lungs, along with other structures
Abdominal Cavity
- bounded by the abdominal muscles below the thoracic cavity
- contains the stomach, intestines, liver, spleen, pancreas, and kidney
Pelvic Cavity
- enclosed by the bones of the pelvis and contains the urinary bladder, part of the intestines, and the internal reproductive organs
- abdominal and pelvic cavities are sometimes referred to as the abdominopelvic cavity
Dorsal Cavity
back of the human body, and it is subdivided into two cavities: cranial and spinal
Cranial Cavity
contains the brain
Spinal Cavity
contains the spinal cord
