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The basic components of tears are:

Water.
Electrolytes. These are what give tears their salty taste.
Proteins (lysozyme, lactoferrin, lipocalin, and IgA). The tears have only about one-tenth of the protein of the blood plasma.
Lipids.
Mucins.

The human choroid is thickest at the far extreme rear of the eye, while in the outlying areas it narrows to 0.1 mm.
Important functions of the choroid include:
The choroid provides oxygen and nourishment to the outer layers of the retina.
Providing nutrients for the retina, macula and optic nerve.
Regulating the temperature of the retina.
Helping control pressure within the eye.
Absorbing light and limiting reflections within the eye that could harm vision.

The ciliary muscle is a ring of smooth muscle in the eye’s middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humor into Schlemm’s canal.
Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle.
It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart.

Osteology is the scientific study of bones, practiced by osteologists. Osteology is a detailed study of the structure of bones, skeletal elements, teeth, microbone morphology, function, disease, pathology, the process of ossification (from cartilaginous molds), the resistance and hardness of bones (biophysics), etc. often used by scientists with identification of vertebrate remains with regard to age, death, sex, growth, and development and can be used in a biocultural context .

“Solar System” model of the atom, also known as the Rutherford-Bohr model, because it was a modification of Rutherford’s model.

Nephrology is a specialty of medicine and pediatrics that concerns itself with the kidneys: the study of normal kidney function and kidney disease, the preservation of kidney health, and the treatment of kidney disease, from diet.

The liver is the human body’s chemical laboratory. This vital organ cleanses toxins from blood and performs important functions for digestion and metabolism. The liver is located in the upper abdomen, to the right of the stomach.

A pyrheliometer is an instrument for measurement of direct beam solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded.

Sources of Vitamin A = Green Vegetables, Fish liver oil, Carrot, Milk
Vitamin A consist of a ring structure attached to a hydrocarbon tail.
The fat soluble vitamin A as such is present only in foods of animal origin.

Neurology is a branch of medicine dealing with disorders of the nervous system. Neurology deals with the diagnosis and treatment of all categories of conditions and disease involving the central and peripheral nervous systems, including their coverings, blood vessels, and all effector tissue, such as muscle.

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