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| Respiratory. Air and food intake. |
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| Respiratory. A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; (the windpipe). |
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| Respiratory. Each of the pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed. |
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| Respiratory. A dome-shaped, muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs. |
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| Circulatory. A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles. |
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| Circulatory. Any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body. |
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| Circulatory. Any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart. |
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| Circulatory. Any of the fine branching blood vessels that form a network between the arterioles and venules. |
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| Circulatory. A mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues. |
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| Circulatory. A small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting. |
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| Heart (Circulatory). The right upper chamber of the heart that receives blood from the superior and inferior vena cava (veins) and the coronary sinus (veins from heart). |
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| Heart (Circulatory). The left upper chamber of the heart that receives blood from the pulmonary veins. |
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| Heart (Circulatory). The chamber on the right side of the heart that receives venous blood from the right atrium and pumps it into the pulmonary trunk. |
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| Heart (Circulatory). The chamber on the left side of the heart that receives arterial blood from the left atrium and pumps it into the aorta. |
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| Urinary. Excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine. |
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| Urinary. The organ that collects urine excreted by the kidneys before disposal by urination. |
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| Urinary/Reproductive. The duct by which urine is conveyed out of the body from the bladder, and which in male vertebrates also conveys semen. |
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| Urinary. The duct by which urine passes from the kidney to the bladder or cloaca. |
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| Digestive. The opening through which food is taken in. |
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| Digestive. The part of the alimentary canal that connects the throat to the stomach; (the gullet). In humans and other vertebrates it is a muscular tube lined with mucous membrane. |
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| Digestive. The internal organ in which the first part of digestion occurs, being (in humans and many mammals) a pear-shaped enlargement of the alimentary canal linking the esophagus to the small intestine. |
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| Digestive. The part of the intestine that runs between the stomach and the large intestine; (the duodenum, jejunum, and ileum collectively). |
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| Digestive. The final section of the large intestine, terminating at the anus. |
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| Digestive. The part of the intestines which extracts moisture from food residues which are later excreted as feces; (the cecum, colon, and rectum collectively.) |
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| Digestive. Located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood. |
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| Digestive. A muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion. |
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| Digestive. A gland near the stomach which secretes a fluid into the duodenum to help with food digestion. |
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| Nervous. An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity. |
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| Nervous. The cylindrical bundle of nerve fibers and associated tissue that is enclosed in the spine and connects nearly all parts of the body to the brain, with which it forms the central nervous system. |
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| Nervous. A whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs. |
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| Nervous. The principal and most anterior part of the brain in vertebrates, located in the front area of the skull. It is responsible for the integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body |
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| Nervous. The part of the brain at the back of the skull in vertebrates. Its function is to coordinate and regulate muscular activity. |
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| Nervous. The continuation of the spinal cord within the skull, forming the lowest part of the brainstem and containing control centers for the heart and lungs. |
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| Reproductive (Male). An organ that produces spermatozoa (male reproductive cells). |
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| Reproductive (Male). A highly convoluted duct behind the testis, along which sperm passes to the vas deferens. |
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| Reproductive (Male). The duct that conveys sperm from the testicle to the urethra. |
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| Reproductive (Male). Each of a pair of glands that open into the vas deferens near its junction with the urethra and secrete many of the components of semen. |
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| Reproductive (Female). A female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair. |
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| Reproductive (Female). The muscular tube leading from the external genitals to the cervix of the uterus in women and most female mammals. |
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| Reproductive (Female). The organ in the lower body of a woman or female mammal where offspring are conceived and in which they gestate before birth; (the womb). |
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| Reproductive (Female). The tube through which an ovum or egg passes from an ovary. |
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