Circulatory System

Our body is composed of several systems which include digestive system, nervous system, muscular system, skeletal system, circulatory system and so on. 

Circulatory system is one of the most important and complex system of our body. The main aim of circulatory system is to provide nourishment and nutrients to the body tissues and carry out the waste products of the body tissues and organs away from those tissues or organs and ultimately out of the body. And that’s how our circulatory system maintain homeostatic condition in our body.  

Blue color vessels = Veins
Red color vessels = Arteries

Physical characteristics of the circulation

The circulation is divided into the pulmonary circulation which supplies blood to the lungs, and the systemic circulation which supplies blood to the remaining tissues of the body. 

The functional parts of circulation are

  • Heart that pumps the blood and is considered as the main organ of circulatory system.
  • Main Aorta carry blood directly from the left ventricle of heart and pass it to the small arteries.
  • Arteries carry blood from the aorta having rapid blood flow and have strong vascular walls. Arteries transport blood under high pressure.
  • Arterioles are the last small branches of arterial system. Arterioles released blood into capillaries through control valves, as per need of the tissues.
  • Capillaries exchange fluid, nutrients between the body tissues. Capillaries have thin walled and highly permeable to small particles.
  • Venules collect blood from capillaries and then pass it into veins. 
  • Veins collect blood from venules and then progressively pass it into large veins called vena cava.
  • Vena Cava carry blood from small veins and ultimately drains it into right atrium of the heart.
STRUCTURE OF A HUMAN HEART

How our Circulatory System works?

Ans: Our circulatory system works in a proper cycle. Oxygenated Blood are pumped from Left Ventricle of the Heart into the Aorta, which then pass into the Arteries, then further into the small Arterioles, then in Capillaries where exchange of fluid and nutrients take place. Blood in return take Carbon dioxide (CO2) from the tissues. This Deoxygenated Blood from Capillaries are taken up by Venules, then transported to Veins, then to Vena Cava which ultimately pour blood into Right Atrium of the Heart. then this Deoxygenated Blood from the Right Atrium pumped into the Right Ventricle, from there it is pumped into Pulmonary Arteries, then ultimately to the Lungs where Deoxygenated Blood is replaced by Oxygenated Blood and then this Oxygenated Blood is pumped into Left Atrium of the Heart which pass the blood into Left Ventricle and the cycle continues…

Doted Chanel = Capillaries