What is the meaning of human circulatory system please tell me it's urgent
Answers
Answer:
Circulatory system: The system that moves blood throughout the body. The circulatory system is composed of the heart, arteries, capillaries, and veins. This remarkable system transports oxygenated blood from the lungs and heart throughout the body via the arteries.
Definition
The circulatory system, also known as the cardiovascular system, consists of the organs and fluids that transport materials across the body. All vertebrates, including humans, have a closed circulatory system, which means that blood remains within blood vessels and does not directly interact with body tissues.
Overview
In birds and mammals, the primary organ of the cardiovascular system is a four-chambered heart, with its associated blood vessels. In other vertebrates, the heart can have either two or three chambers. Many invertebrates have an open circulatory system, where blood (also known as hemolymph) bathes the cells and organs directly. Some of these organisms, such as an octopus, can have multiple hearts spread across their body. Open vs closed circulatory systems have evolved in different lineages over time.
As seen in the diagram attached below, the circulatory system spans the entire body. As it moves blood around the system, it is both bringing oxygen to the tissues and carrying away the waste products they create. The circulatory system also has many functions related to delivering hormones, allowing the passage of immune cells, and other functions related to coordinating and maintaining a multicellular organism. Let’s take a closer look at some of these functions.
Circulatory System Function
Animal evolution has resulted in an increasing degree of specialization within tissues and organs. For instance, simple multicellular organisms like sponges have structures where every cell interacts directly with the environment. Each cell exchanges materials, obtains nutrients, and expels its waste into the extracellular region. In larger, more complex animals, however, this is difficult since there are many cells present deep inside the organism that interact minimally with the external environment.
Therefore, each of the basic functions of an organism has to be accomplished by a specialized set of organs. For example, the digestive system is specialized for efficiently extracting useful nutrients from food. Similarly, the respiratory system deals with the exchange of gases, while the nervous and endocrine systems are involved in coordination and homeostasis. However, in order to sustain each of these organ systems, the body needs a circulatory system. The circulatory system allows every cell, whether present on the surface of the organism or embedded deep within, to derive sustenance, be protected from pathogens, to communicate with other cells and to exist in a relatively constant microenvironment.
