The heart consists of two pumps. The right side of the heart pumps blood to the lungs. The left side of the heart receives oxygenated blood from the lungs and pumps it throughout the rest of the body.
The female reproductive system produces female gametes (eggs), provides a place for eggs to be fertilized by sperm, houses a developing fetus, and gives birth to offspring.
Located in the thoracic cavity, the heart is a four-chambered muscular organ that provides the primary force moving blood through the circulatory system.
Eggs are cells that differ from body cells, known as somatic cells, by the fact that they must eventually become haploid (having only one set of chromosomes) in preparation for fusion with the haploid sperm nucleus.
The mouth is the part of the digestive system where digestion begins. The major components of the mouth shown here are the teeth, the gums, the tongue, and the palate.
An alveolus is a tiny air sac located within the lungs. The exchange of oxygen and carbon dioxide takes place within the millions of alveoli in the lungs.
Human sperm cells (and the sperm cells of other animals) are male haploid gametes. This means that each sperm carries half of the genetic information that humans need.
The urinary system is the collection of organs and structures that function in the removal of waste material from the body. It also regulates blood volume and levels of electrolytes.
The uterus, or womb, is a muscular organ in which a fetus develops during pregnancy. The human uterus is a single uterus geared to gestating a single fetus.