Three Organs In The Human Body: The Cardiovascular System

THE CIRCULATORY SYSTEM

The cardiovascular system is composed of three organs in the human body: the heart, blood vessels, and blood. It is centered on the heart a powerful organ that steadily pumps blood to a complex system of blood vessels that extends to the entire body. The blood that is pumped to the body is rich with oxygen and nutrients needed to fuel the activities of the body’s tissues and organ. An average-sized adult carries about 5 liters (9 pints) of blood through the vessels, or better known as arteries (Seidel et al., 2014). In addition, the blood vessels can be described as the highway in which the blood travels on in order to get to all the organs in the human body. Furthermore, the vessels are connected to the heart and these two organs work in concert (i.e. together) in order to supply the human body with blood (Goff et al., 2013).

PARTS OF THE SYSTEM

All the production of blood from the left side of the heart goes into the aorta, the body’s largest artery. The other arteries branch from the aorta to supply blood to the rest of the body. The blood is drained from the body by veins into two

large vessels, the inferior and superior venae cava, which transport the blood back to the right side of the heart (Gañán-Calvo et al., 2015).

INSIDE THE HEART
The heart has two upper chambers, called atria, and two lower chambers, called ventricles. Blood from the body arrives in the right atrium. The blood passes to the right ventricle, which pumps it to the lungs to pick up more oxygen. The left atrium receives oxygen-rich blood back from the lungs. This passes to the left ventricle, which pumps it by way of the aorta to the body.

HEART VALVES
At the exit of each heart chamber lies a valve, which ensures the one-way flow of blood through the heart and into the circulation. These valves are made of flaps that open to allow blood to pass through but snap tightly shut to prevent backflow.

BLOOD VESSELS
There are three main types of vessel. Arteries carry blood from the heart to the body’s tissues, while veins carry blood back from the tissues to the heart. Small arteries are called arterioles and small veins are referred to as venules. The third and smallest type of vessel, capillaries, form a network connecting the smallest arterioles with the smallest venules.

Figure 1: How Does Blood Flow Through the Heart.
https://my.clevelandclinic.org/services/heart/heart-blood-vessels/how-does-blood-flow-through-heart

Functions of the Cardiovascular System
All of these organs are dedicated to accomplish one goal: to keep you alive!

But, from a scientific point of view, these organs transport nutrients in the human body and to remove waste, better known as metabolic waste. Moreover, it also regulates body temperature in the human body and it protects the body and the next question is how does it work? The cardiovascular system performs three major function: transport, protection and regulation. When the system transport, it transports, nutrients, hormones and of course oxygen. The other function is protection, it protects the human body by using white blood cells, antibodies and it defends the body against foreign microbes and toxins. The last function is regulation, and this is the most straightforward function, it regulates body temperature with fluid pH and cells that have water content (Farley et al.

2013