Illustration of benign fibroid tumor of the uterine wall. Tumors are caused by the unrestrained growth and division of cells. If they remain localized, they are classified as benign. If they spread and invade other tissues, they are defined as cancer.

Calcium channel blocker acting on a smooth muscle cell. Nerve cells connect to muscle fibers and release neurotransmitter chemicals. This causes the muscle fiber to release calcium ions, electrically charged atoms that induce mechanical contraction.

H2 blockers inhibiting allergic response. Antigens (green triangles) enter the body, bind with IgE on mast cells (middle left), and trigger the release of histamine (green balls). Histamine attaches to receptors on blood vessels, causing vasodilation, edema, and inflammation. H2 blocker drugs (yellow balls) block histamine from engaging the receptors.

Close-up of Uterine Artery Embolism Technique- a new technique for treatment of fibroid tumors- an alternative to hysterectomy. The fine, plastic particles cut off the blood supply to the tumors, thus shrinking them.

Endocrine hormone being released into bloodstream.

Osteoporosis in the pelvic bone. Osteoporosis, the abnormal rarefication of bone, usually occurs in older adults. The weakness and softness of the bone make it more prone to fracture. Most common are fractures of the wrist and hip.

Medical illustration of the gene gate hypothesis.

Medical illustration of excessive cholesterol in the bloodstream (hypercholesterolemia), which may lead to atherosclerotic plaque buildup on the arterial wall.

Medical illustration showing gynecology.

Medical illustration showing fungal infection of the skin called dermatophytes.

Medical illustration showing urinary tract infection in a child due to E-coli bacteria.

Medical illustration showing man with a migraine headache.

Illustration of a gastric ulcer.

Illustration of pediatric cardiology.

Skin disease- dermatitis urticaria, eczema, etc.

Sperm being blocked from reaching egg in uterus due to use of spermacide.

Illustration of fibroid tumors of the uterus. Uterus, ovaries and vagina are shown in frontal view. Uterus and vagina are sectioned to show the inside. Fallopian tubes and ovaries are shown full view.

Fibroid tumors of the uterus, anterior view.

Illustration of various allergens: pollen, mold spores, dust mites, insect droppings, animal dander.

Eye problems: Blepharitis, strabismus and conjunctivitis on an adult (top), child (middle) and infant (bottom) respectively.