Syringe
A medical device that is used to inject fluid into, or withdraw fluid from, the body. A medical syringe consists of a needle attached to a hollow cylinder that is fitted with a sliding plunger. The downward movement of the plunger injects fluid; upward movement withdraws fluid. Medical syringes were once made of metal or glass, and required cleaning and sterilization before they could be used again. Now most syringes used in medicine are plastic and disposable.
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- System, autonomic nervous
the sympathetic nervous system, which accelerates the heart rate, constricts blood vessels, and raises blood pressure, and the parasympathetic nervous system, which slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles.
- System, cardiac conduction
The electrical conduction system that controls the heart rate. This system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. Among the major elements in the cardiac conduction system are the sinus node, atrioventricular node, and the autonomic nervous system. The sinus node is […]
- System, cardiovascular
The circulatory system which comprises the heart and blood vessels. The system carries nutrients and oxygen to the tissues of the body and removes carbon dioxide and other wastes from them. The cardiovascular system is a closed tubular system in which the blood is propelled by the heart. The system has two circuits, the pulmonary […]
- System, immune
improper development of the thymus gland means that T cell production is diminished. Other immune disorders result from either an excessive immune response or an ‘autoimmune attack’. Asthma, familial Mediterranean fever and Crohn disease (inflammatory bowel disease) all result from an over-reaction of the immune system, while autoimmune polyglandular syndrome and some facets of diabetes […]
- System, locomotive
The system that permits locomotion, movement from one place to another. The key components of this system are the bones that are the framework of the skeleton, the joints that hold the bones together and make movement possible, and the muscles that contract and relax and make for movement. Locomotive is derived from the Latin […]