Recent animal experiments have indicated that components of tear fluid are absorbed in the nasolacrimal passage and are transported into the surrounding cavernous body that is subject to autonomic control
and regulates tear outflow (Table 1.2) . Under normal conditions tear fluid components are constantly absorbed into the blood vessels of the surrounding cavernous body. These vessels are connected to the blood vessels of the outer eye and could act as a feedback signal for tear fluid production (Fig. 1.11) [13, 19], which ceases if these tear components are not absorbed (see Chap. 2).
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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.