10/13/2023 The term that crawling cells that move through a sponge delivering food and oxygenRead NowGas exchange is one essential function of the circulatory system. Understanding the heart’s basic anatomy and function is important to understanding the body’s circulatory and respiratory systems. Heart contractions are driven by intrinsic electrical impulses that the brain and endocrine hormones help to regulate. ![]() Made of specialized and unique cardiac muscle, it pumps blood throughout the body and to the heart itself. The size of a clenched fist, the human heart is protected beneath the rib cage. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste, which are byproducts of respiration.Īt the core of the human circulatory system is the heart. The circulatory system has evolved over time from simple diffusion through cells in the early evolution of animals to a complex network of blood vessels that reach all parts of the human body. Most animals are complex multicellular organisms that require a mechanism for transporting nutrients throughout their bodies and removing waste products. ![]() (credit: modification of work by Andrey Belenko) Introduction ![]() Just as highway systems transport people and goods through a complex network, the circulatory system transports nutrients, gases, and wastes throughout the animal body. Charles Molnar and Jane Gair Figure 21.1.
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