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The skin is one of the largest organs of the body. In humans, it accounts for about 12 to 15 percent of total body weight and covers 1.5 to 2 m 2 of surface area. [1] 3D still showing human integumentary system. The skin (integument) is a composite organ, made up of at least two major layers of tissue: the epidermis and the dermis. [2]
Samples of blood and urine are taken at specific time intervals following application (0.5, 1, 2, 4, 10, and 24 hours) and in some protocols at the chosen end time the animal maybe necropsied. Tissue samples may also be evaluated for the presence of the test chemical. [ 18 ]
hearing and balance (the ear, which includes the auditory system and vestibular system) smell (the nose) taste (the tongue) The distinction between special and general senses is used to classify nerve fibers running to and from the central nervous system – information from special senses is carried in special somatic afferents and special ...
Mammal skin: (1) hair, (2) epidermis, (3) sebaceous gland, (4) Arrector pili muscle, (5) dermis, (6) hair follicle, (7) sweat gland. Not labelled, the bottom layer: hypodermis, showing round adipocytes. The integumentary system (skin) is made up of three layers: the outermost epidermis, the dermis and the hypodermis. The epidermis is typically ...
The yolk sac is a membranous sac attached to the embryo, which provides nutrients and functions as the circulatory system of the very early embryo. [ 3 ] The lateral body wall folds, pulling the amnion in with it so that the amnion surrounds the embryo and extends over the connecting stalk, which becomes the umbilical cord , which connects the ...
Parts-per-million cube of relative abundance by mass of elements in an average adult human body down to 1 ppm. About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
3D medical illustration explaining the oral digestive system. The mouth is the first part of the upper gastrointestinal tract and is equipped with several structures that begin the first processes of digestion. [3] These include salivary glands, teeth and the tongue. The mouth consists of two regions; the vestibule and the oral cavity proper.
Regional anatomy is the study of the interrelationships of all of the structures in a specific body region, such as the abdomen. In contrast, systemic anatomy is the study of the structures that make up a discrete body system—that is, a group of structures that work together to perform a unique body function, such as the digestive system. [11]