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| This glossary contains: 19186 medical terms |
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Nearsightedness
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Nearsightedness Focusing defect in which the eye is overpowered. Light rays coming from a distant object are brought to focus before reaching the retina. Requires a minus lens correction to "weaken" the eye optically and permit clear distance vision.
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Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
Lens
The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.
Vision
The sense of sight.
SIMILAR TERMS--------------------------------------
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Nocturnal emission
A nocturnal emission is an ejaculation of semen experienced by males during sleep. It is also called a "wet dream"; this term is also used figuratively for something very pleasurable but often imagined or hoped for.
Nucleotides
The components of DNA, consisting of phosphate, a sugar derivative and one of the following bases: adenine, cytosine, guanine, or thymine. They are represented by their initial letters in a nucleotide sequence.
Nitric Oxide
A protohormone that generates cyclic GMP. Nitric oxide is a free radical.
Nervous system
The system of cells, tissues and organs that regulates the body's responses to internal and external stimuli. In vertebrae it consists of the brain, spinal cord, nerves, ganglia and parts of the receptor and effector organs.
Nephrology
The medical specialty which focuses on the treatment of disorders of the kidneys.
Nearsightedness
Nystagmus
Nystagmus is a rhythmic, repetitive, oscillatory eye movement. It may occur as a result of vestibular problems, as a result of visual problems, or as a result of certain brain stem or cerebellar abnormalities. Vestibular Nystagmus is characterized by a slow migration of the eyes in the wrong direction, followed by a sudden jerking back response.
Norepinephrine
A hormone produced by the adrenal glands that also acts as a neurotransmitter for nerve cells. Part of the fight-or-flight response.
Neurotransmitter
Specialized chemical messenger (eg, acetylcholine, dopamine, norepinephrine, serotonin) that sends a message from one nerve cell to another. Most neurotransmitters play different roles throughout the body, many of which are not yet known.
Non-insulin-dependent diabetes
A condition in which the body either makes too little insulin or cannot properly use the insulin it makes to convert blood glucose to energy. Type 2 diabetes may be controlled with diet, exercise, and weight loss, or may require oral medications and/or insulin injections.
Nutrients
Proteins, carbohydrates, fats, vitamins, and minerals provided by food and necessary for growth and the maintenance of life.
RELATED TERMS--------------------------------------
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
Lens
The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.
Vision
The sense of sight.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Nocturnal emission
A nocturnal emission is an ejaculation of semen experienced by males during sleep. It is also called a "wet dream"; this term is also used figuratively for something very pleasurable but often imagined or hoped for.
Nucleotides
The components of DNA, consisting of phosphate, a sugar derivative and one of the following bases: adenine, cytosine, guanine, or thymine. They are represented by their initial letters in a nucleotide sequence.
Nitric Oxide
A protohormone that generates cyclic GMP. Nitric oxide is a free radical.
Nervous system
The system of cells, tissues and organs that regulates the body's responses to internal and external stimuli. In vertebrae it consists of the brain, spinal cord, nerves, ganglia and parts of the receptor and effector organs.
Nephrology
The medical specialty which focuses on the treatment of disorders of the kidneys.
Nearsightedness
Nystagmus
Nystagmus is a rhythmic, repetitive, oscillatory eye movement. It may occur as a result of vestibular problems, as a result of visual problems, or as a result of certain brain stem or cerebellar abnormalities. Vestibular Nystagmus is characterized by a slow migration of the eyes in the wrong direction, followed by a sudden jerking back response.
Norepinephrine
A hormone produced by the adrenal glands that also acts as a neurotransmitter for nerve cells. Part of the fight-or-flight response.
Neurotransmitter
Specialized chemical messenger (eg, acetylcholine, dopamine, norepinephrine, serotonin) that sends a message from one nerve cell to another. Most neurotransmitters play different roles throughout the body, many of which are not yet known.
Non-insulin-dependent diabetes
A condition in which the body either makes too little insulin or cannot properly use the insulin it makes to convert blood glucose to energy. Type 2 diabetes may be controlled with diet, exercise, and weight loss, or may require oral medications and/or insulin injections.
Nutrients
Proteins, carbohydrates, fats, vitamins, and minerals provided by food and necessary for growth and the maintenance of life.
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This dictionary contains 19186 terms.
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