Fetal development: second and third trimester.

Injury to.hand of football player while catching ball.

Comparison of hearts of active vs. sendentary person.

Major trauma.

Risk factors commonly associated with chronic hepatitis (liver disease): drug and alcohol abuse, virus-infected blood.

Illustration showing screening for hypertension.

Myocardial ischemia.

Drug therapy: pill taken by man.

Illustrastion of nerve cells being damaged.

Illustration of shoulder dystocia, where the baby's shoulder is caught on the mother's pelvis during delivery.

Medical illustration of a physical examination of the heart: the puzzle of the diagnosis.

Illustration of cardiac arrhythmias (irregular heartbeat). The upper ovoid shape is the SA node and the lower one attached to branching nerve-like structures is the AV node. An electrocardiogram (ECG) chart is wrapping around the transparent heart.

Illustration of drug management of cardiac arrhythmias (irregular heart beats).

Cryosurgery: freezing a tumor in the liver.

White blood cells of immune system attacking bacterial pathogens. The inset shows sepsis and multiple system organ failure.

Back view of brain undergoing radiosurgery for brain metastases.

Illustration of a woman with chronic fatigue syndrome (CFS). CFS is characterized by debilitating exhaustion from simple tasks and flu-like symptoms including headache, poor sleep, sore throat, swollen lymph nodes, joint and muscle pain, and malaise.

Dementia: progressive loss of rational behavior in the elderly.

Medical illustration depicting the reflex as a rapid way of responding to an emergency situation, such as pain caused by the nail pressure on the finger.

The effects of smoking: chronic lung disease.