Circuratory System

The circulatory system is one of the most important systems in the body.

The circulatory system is a network consisnig of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transporthormones, and removes unnecessary waste products.

When you exercise you can feel your pulse, it tells you how fast your heart is pumping.

THE HEART:

The heart is made of specialized cardiac muscle tissue that allows it to act as a pump within the cyrculatory  system.

The human heart is divided into fours chambers. There are one atrium and one ventricle on each side of the heart. The atria receivve blood and the ventricles pump blood.

The human cyrculatory system consists of several circuitis:

• The  pulmonary circuit provides blood flow between the heart and lungs.

• The systemic circuit allows blood to flow to and from the rest of the body.

• The cornary circuit strictly provides blood to the heart.

BLOOD AND BLOOD VESSELS:

Blood from heart is pumped throughout the body using blood vessels. Arteries carry blood away from the heart and into capillaries, providing oxygen (and other nutrients) to tissue and cells. Once oxygen is removed, the blood travels back to the lungs, where it is reoxygenated and returned by venis to the heart.

The main artery of the system circuit is the aorta which branches out into other arteries, carrying blood to different parts of the body.

Circulatory System Song

Words to know:

• Aorta - the main artery in mammals that carries blood from the left ventricle of the heart to all the branch arteries in the body except those in the lungs.

• Arteries - a blood vessel that is part of the system carrying blood under pressure from the heart to the rest of the body.
  

• Atrium - one of the upper chambers of the heart that takes blood from the veins and pumps it into a ventricle.
  

• Capillaries - an extremely narrow thin-walled blood vessel that connects small arteries arterioles with small veins to form a network throughout the body.
  

• Cells - the cell is the basic unit of life. Some organisms are made up of a single cell, like bacteria, while others are made up of trillions of cells.
  

• Circulatory - relating to the circulation of the blood.
  

• Contractions - a tightening or narrowing of a muscle, organ, or other body part.

• Nutrients - a substance that provides nourishment.
  

• Organ - a complete and independent part of a plant or animal that has a specific function.

• Oxygen - a colourless, odourless gas that is essential for plant and animal respiration.

• Pulse - the regular expansion and contraction of an artery, caused by the heart pumping blood through the body.

• Transporting -  to carry somebody or something from one place to another.
  

• Veins - a blood vessel that carries blood to the heart.
  

• Waste - unwanted or unusable remains, or by-products.