The heart is the first organ to function in vertebrate embryos. The human heart, for example,
starts beating around the 21st embryonic day. During the initial phase of its pum** action …

The unaided eyes of early observers could make of the beating heart of a transparent living
embryo little more than a pulsating red fleck. With the discovery of the circulation in the adult …

The indiscriminate use of caffeine by people of all ages may present health hazards. The
public at large needs to be more informed of the presence of caffeine in commonly …

METHODS Human placentae at full term were used throughout'and in most cases prepared
within 1-i hr. after the delivery. Cannulae were inserted into the two umbilical arteries 5-10 …

This volume is a unique overview of cardiovascular development from the cellular to the
organ level across a broad range of species. The first section focuses on the molecular …

The digitalis drugs are plant-derived cardenolide compounds used medicinally for several
hundred years. These drugs elicit inotropic and chronotropic effects on the heart, but they …

In vertebrates, the coordinated beat of the early heart tube drives cardiogenesis and
supports embryonic growth. How the heart pumps at this valveless stage marks a fascinating …

With the aid of three-stage amplification, electrocardiographic records were made from chick
embryos during the early stages of heart development. The youngest embryo from which …

Complete understanding of the ontogenesis and early development of electrical activity and
its related contraction has been hampered by our inability to apply conventional …

The effects of drugs upon the hearts of a number of arthropods have been investigated by
immersion of the specimens in test solutions. Acetylcholine, potassium and other substances …