2025年2月11日 · Circulatory system, system that transports nutrients, respiratory gases, and metabolic products throughout a living organism. Circulation includes the intake of metabolic materials, the movement of these materials to and from tissues and organs, and the return of harmful by-products to the environment.

2025年2月11日 · Circulatory system - Vascular, Heart, Blood: While ciliary respiratory currents are sufficient to supply the requirements of animals with simple epithelial tissues and low metabolic rates, most species whose bodies contain a number of organ systems require a more efficient circulatory system.

The fluids move through what is called a circulatory system. The fluids carry nutrients and gases, like oxygen, that keep the animals alive. The fluids also remove wastes from the body.

2025年2月7日 · human cardiovascular system, organ system that conveys blood through vessels to and from all parts of the body, carrying nutrients and oxygen to tissues and removing carbon dioxide and other wastes. It is a closed tubular system in which the blood is …

2025年1月17日 · Circulation, the continuous movement of blood throughout the body, driven by the pumping action of the heart. The circulation of the blood links the sites of oxygen utilization and uptake in the body. Learn more about the main …

2024年12月17日 · Circulatory system - Coelomates, Blood Vessels, Heart: Despite their greater potential complexity, many of the minor coelomate phyla (e.g., Pogonophora, Sipuncula, and Bryozoa) contain small animals that rely on direct diffusion and normal muscular activity to circulate the coelomic fluid.

2024年12月17日 · Circulatory system - Blood, Oxygen, Heart: The fluid compartments of animals consist of intracellular and extracellular components. The intracellular component includes the body cells and, where present, the blood cells, while the extracellular component includes the tissue fluid, coelomic fluid, and blood plasma.

2024年12月17日 · The whole circulatory system is a one-way arrangement, with the heart pumping only deoxygenated blood from the body forward to the gills to be oxygenated and redistributed to the body. Although six gill slits appear in embryos, few adult fishes retain all six.

2025年1月27日 · Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds. Learn more about the heart in this article.

2025年2月11日 · Circulatory system - Amphibians, Blood Vessels, Heart: Modern amphibians are characterized by the flexibility of their gaseous exchange mechanisms. Amphibian skin is moistened by mucous secretions and is well supplied with blood vessels. It is used for respiration to varying degrees.