Worlds of David Darling > Children's
Encyclopedia of Science > Health Revolution > Glossary
THE HEALTH REVOLUTION:
Surgery and Medicine in the Twenty-first Century
a book in the Beyond 2000 series by David Darling
A progressive deterioration of the brain, most common in elderly people,
that results in a loss of memory and a general breakdown in mental and physical
A basic particle of matter. All substances are made of atoms, which are
often combined to make larger units called molecules. Inside each atom are
smaller particles known as protons, neutrons, and electrons.
The replacement of blood lost by a patient by other blood of the same type
or a compatible type.
The technique of computerized axial tomography, which directs a series of
X-ray beams through the body to produce detailed cross sections.
A cloudiness of the lens of the eye, which can lead to blindness. It is
common in old age and may also result from an illness such as diabetes.
The spiral-shaped structure in the inner ear in which sound vibrations of
different frequencies are turned into nerve impulses before being sent to
The transparent, protective outer covering of the center of the eye.
A device that can be used to restart the heart by producing a strong electric
shock across a patient's chest.
Pictures built up from many separate points, each point representing an
item of data that has been collected by an instrument and stored as a number
inside a computer.
A scanning technique that uses ultrasound to measure the speed of moving
objects, for example, the blood inside the body.
A conducting part, usually made of metal, by which an electric current leaves
or enters a device.
A long, flexible device equipped with a light, a lens, and various instruments
that can be used to look inside the body and carry out certain types of
An unborn child from the end of the eighth week of pregnancy to the moment
of birth. Before the eighth week the unborn child is known as an embryo.
Pincers used by surgeons for a variety of purposes, such as holding back
tissues or pinching off several blood vessels to prevent bleeding.
When applied to waves such sound waves, light waves, or radio waves, it
is the number of vibrations, or waves, that pass a point in one second.
A disease in which the pressure of the liquid inside the eyeball increases
above normal. Unless treated in time, the disease causes irreparable damage
to a person's sight
The smallest particle of hydrogen. Hydrogen atoms are very common in many
substances and tissues in the human body.
The body's chemical defense system, which is used to identify and destroy
foreign invaders, such as viruses.
An artificial part or device that is placed inside the human body to take
the place of a natural part that has been damaged by accident or disease.
Light similar to ordinary light but invisible and consisting of waves of
lower frequency. We experience infrared light as heat waves.
Surgery that is carried out through small cuts and openings about the size
of a thumbnail.
The region around a magnet where the effects of the magnet are exerted.
A microchip that is used to store information for use by a computer.
A complex circuit made from microscopic components, laid down on a single
crystal of a substance called silicon, that can store r process information.
A microchip that works as the processing section of a computer.
Surgery so delicate that it requires the use of a surgical microscope and
A term used to describe surgery that attempts to treat the patient while
causing as little damage to the body as possible.
The technique of magnetic resonance imaging. A patient in an MRI scanner
is surrounded by a strong magnetic and exposed to high-frequency radio waves.
This causes the nuclei of hydrogen atoms to give off radio waves at a certain
frequency that the scanner is set up to detect.
The central part of an atom, which contains most of its mass. The nucleus
consists of protons and (except for atoms of ordinary hydrogen) neutrons.
A fine, bendable strand of specially made glass or plastic in which light
can easily travel.
A part of the body, built up from various types of tissue, that performs
a unique, important task. Examples of organs include the heart, the brain,
the lungs, the stomach, and the kidneys.
A new type of surgical procedure that involves operating through needle-sized
The technique of positron emission tomography. This involves injecting a
patient with a radioactive sugar solution and then using a PET scanner to
measure how much of the sugar has been absorbed by different parts of the
A very small positively charged particle found within the nuclei of atoms.
Emitting penetrating rays and particles of several types due to the breakup
of the nuclei of certain atoms.
The layer at the back of the eye that senses the intensity and color of
A tool used in surgery to hold back parts, such as bones and muscles, that
would otherwise get in the way of the operation.
A very sharp, lightweight knife used in surgery.
A device used to distinguish and separate the different parts that make
up a sound or other kind of signal.
A group of similar cells that perform a specific and common function. For
example, a section of muscle, a section of skin, and a part of an organ
The replacement of a diseased or defective organ, or part of an organ, with
a healthy organ taken from another person.
An abnormal growth in some part of the body.
Sound consisting of waves of very high frequency.
High-frequency electromagnetic waves that can be used to take pictures of
structures inside the body.