Human Physiology: An Elementary Text-book with Special Emphasis on Hygiene and Sanitation

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World book Company, 1915 - Hygiene - 370 pages
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Page 262 - The iris lies behind the transparent cornea, and being seen through the cornea, gives the color to the eye. A person is black-eyed, browneyed, or blue-eyed, according to the pigment in his iris. The Function of the Iris. The function of the iris is to regulate the amount of light that enters the eye. In the iris are circular muscle fibers, running around the pupil, and when these contract, they make the pupil smaller. Other muscle fibers run in from the outer edge of the iris to the pupil, and when...
Page 222 - Sow a thought and reap an act ; sow an act and reap a habit ; sow a habit and reap a character ; sow a character and reap a destiny.
Page 37 - Each has a large bone in the upper part, the humerus in the arm, and the femur in the thigh. Each has two bones in the lower part, the radius and the ulna in the forearm, and the tibia and fibula in the leg below the knee. In both the wrists and the ankles we find a group of small bones, the eight carpal bones in the wrist, and the seven tarsal bones in the ankle. In the hand beyond the carpals are five metacarpal bones, each bearing a finger, and in the foot beyond the tarsals are five metatarsal...
Page 253 - The bones of the ear. Across the middle ear a chain of three small bones stretches from the tympanic membrane to the inner ear. These bones are called from their shape the malleus (hammer), the incus (anvil), and the stapes (stirrup). The malleus is...
Page 99 - Anatomy of the liver. — The liver is the largest gland in the body. It is of a reddish brown color and weighs about three and one half pounds.
Page 144 - ... from the right auricle into the right ventricle; from the right ventricle by the way of the lungs into the left auricle; thence into the left ventricle and aorta; whence by the arteries at large through the pores or interstices of the tissues into the veins, and by the veins back again with great rapidity to the base of the heart.

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