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Circulation
Circulation The flow of blood through the body. Includes the heart, arteries, veins and capillaries.
RELATED TERMS--------------------------------------
Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.
Heart
The hollow, muscular organ responsible for pumping blood through the circulatory system.
Arteries
Blood vessels that carry blood away from the heart to the arms, legs, head, body and organs.
Veins
Blood vessels that carry blood from the arms, legs, head and body organs back to the heart.
Capillaries
Tiny blood vessels between arteries and veins that distribute oxygen-rich blood to the body.
SIMILAR TERMS--------------------------------------
Circadian
Fluctuating regularly on a time basis usually entrained to a metabolic, endocrine, neurochemical, light-dark, temperature, or seasonal cycle (see also diurnal, ultradian). There are very fast biorhythm cycles such as in the EEG and ECG, a 90-minute cycle seen in REM-NREM sleep or in waking attentive/alert-drowsy/inattentive swing, a twice daily body temperature peak and slump. a 24-hour ACTH cycle, a monthly menstrual cycle, and possibly longer seasonal cycles not yet thoroughly described.
Circadian rhythm
Biological timing and rhythmicity that, in humans, is characterised by cycles of approximately 24 hours. Synonym: biological clock.
Circanol
Circanol is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): ergoloid mesylates.
Circle of Willis
An arterial circle at the base of the brain that is of critical importance. The circle of Willis receives all the blood that is pumped up the two internal carotid arteries that come up the front of the neck and that is pumped from the basilar artery formed by the union of the two vertebral arteries that come up the back of the neck. All the principal arteries that supply cerebral hemispheres of the brain branch off from the circle of Willis.
Circular breathing
Inhaling through the nose and inflating the cheeks and neck with air at the same time.Some saxophone players do circular breathing; this may not be a safe practice since it may reduce blood flow to the brain.
Circulation, fetal
The blood circulation in the fetus (the unborn baby). Before birth, the blood from the heart that is destined (in the pulmonary artery) for the lungs is shunted away from the lungs and returned to the greatest of arteries (the aorta). The shunt is through a short vessel called the ductus arteriosus. When this shunt is open, it is said to be a patent (pronounced pá tent) ductus arteriosus (PDA). The PDA usually closes at or shortly after birth and blood is permitted to course freely to the lungs.
Circulatory
Having to do with the circulation, the movement of fluid in a regular or circuitous course. Although the adjective "circulatory" need not necessarily refer to the circulation of the blood, for all practical purposes today it does. A circulatory problem is taken usually to be a problem with the blood circulation, for example with heart failure.
Circulatory system
Pertaining to the heart and blood vessels, and the circulation of blood.
Circum-
Prefix meaning around, surrounding, or encircling. As in circumcision, circumflex, and circumjacent. From the Latin preposition circum meaning round.
Circumcision
The surgical removal of the sheath of skin (called a foreskin) that covers the head of the penis.
Circumflex
Curved like a bow. In anatomy, circumflex describes a structure that bends around like a bow. For example, the circumflex branch of the left coronary artery.
Circumscribed
Having a border, localized. Often associated with a capsule and benign tumors of the brain, for example, meningiomas, pituitary adenomas and acoustic neuromas. See diffuse.
Circumstantiality
Pattern of speech that is indirect and delayed in reaching its goal because of excessive or irrelevant detail or parenthetical remarks. The speaker does not lose the point, as is characteristic of loosening of associations, and clauses remain logically connected, but to the listener it seems that the end will never be reached.
PREVIOUS AND NEXT TERMS--------------------------------------
Chlorination
The addition of chlorine to kill harmful microorganisms in water or sewage.
Cholesteatoma
A tumor-like mass that sometimes forms as a result of a chronic middle ear infection.
Chondritis
Inflammation of the cartilage.
Chondromalacia
Softening of cartilage.
Cilia
Short, hair-like structures extending from certain cells.
Circulation
Claustrophobia
Fear of closed spaces.
Clavicle
Collarbone.
Clawhand
A condition of the hand causing distorted fingers resulting from nerve injury.
Cleft lip or palate
A congenital split of the upper lip or roof of the mouth.
Clostridium
A genus of bacteria that includes the agents capable of causing food poisoning and tetanus.
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