A Practical Physiology
is a scientific publication written in the late 19th century. This textbook delves into the essential aspects of human physiology and hygiene, tailored specifically for students in higher educational settings. The text em phasizes both the anatomical and functional understanding of the human body, aiming not only to educate about bodily structures but also to con nect this knowledge to principles of health and wellness. The opening of the book introduces the field of physiology, igniting curiosity by highlight ing fundamental questions about human life, such as howfoodcontributes to the body's intricate structures and the processes that sustain life. Blaisdell establishes the book's pedagogical approach, stating the importance of prac tical experiments alongside theoretical study to foster understanding. He underscores how physiology serves not just academic pursuits but also ap plies directly to personal health and living well. The section outlines various keytopicsand laysaframeworkforexaminingthebody'ssystems, addressing the interplay between anatomy and the functions they serve, thuspreparing students for a comprehensive study of human physiology.
So after prolonged mental exertion, or in fact any effort which involves an expenditure of what is often called nerve force, sleep becomes a necessity. The need of such a rest is self-evident, and the loss of it is a common cause of the impairment of health. While we are awake and active, the waste of the body exceeds the repair; but when asleep, the waste is diminished, and the cells are more actively rebuilding the struc ture for to-morrow's labor. The organic functions, such as are under the direct control of the sympathetic nervous system, -circulation, respiration, and digestion, -are diminished in activity during sleep. The pulsations of the heart and the respiratory movements are less frequent, and the circula tion is slower. The bodily temperature is reduced, and the cerebral circula tion is diminished. The eyes are turned upward and inward, and the pupils are contracted
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