BIO 201 Lecture Notes - Lecture 3: Situs Solitus, Dextrocardia, Facial Expression
Document Summary
Anatomical variation: no two humans alike, 70% most common structure, 30% anatomically variant, variable number of organs, missing/extra muscles, vertebrae, renal arteries, variable organ locations, situs solitus, situs inverses, dextrocardia, spleen, kidneys (vary somewhat), vasculature (varies considerably) Integumentary system: for external body covering, composed of, skin, sweat glands, oil glands, nails, protects deep tissues from injury and synthesizes vitamin d. Skeletal system: composed of, bone, cartilage, ligaments, bone marrow for blood cells, protects and supports organs, provides framework for muscles, stores minerals. Muscular system: composed of muscles and tendons, allows manipulation of, environment, locomotion, facial expression, communication, posture. Nervous system: composed of, brain, spinal column, nerves, fast-acting control system. Organ systems interrelationships: nutrients and oxygen are distributed by the blood, nothing in the body works alone, nothing works in isolation. 5 features of the external environment necessary for life: pressure, can only deal with a small percent of the earth"s pressure zones, atmosphere.
