Essentials of Anatomy and Physiology

1. Chemical Level
   2. Cellular Level
   3. Tissue Level


2. Organ Level


3. Organ System
   Level


4. Organism Level

Cuboidal epithelium

Squamous epithelium

Smooth muscle

Kidney

Urinary

bladder

Urinary

system

Figure 1–1. Levels of structural organization of the human body, depicted from the

simplest (chemical) to the most complex (organism). The organ system shown here is the

urinary system.

QUESTION:What other organ system seems to work directly with the urinary system?

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