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the circulatory system
Transcript of the circulatory system
What is the circulatory system?
Its the body system that circulates blood throughout the body and delivers nutrients and other essential materials to cells, regulates body temperature, fights diseases, and removes waste products. It consists of the heart, blood vessels, and blood. It’s also known as the cardiovascular system.
What is the heart?
The heart is a muscular organ that is located in the left side of the chest. It’s the most powerful organ in the body and is important part to the human body and if it stopped functioning, then we wouldn’t be able to live. The main function of the heart is to pump blood to the deliver to the rest of the body through blood vessels.
The heart has a right and left side and the wall that separates the two sides is called the septum.
There are two types of chambers: the upper, which is an atrium, and the lower, which is the ventricle.
The atrium receives blood that comes into the heart and the ventricle pumps blood out the heart. The four chambers are the right and left atrium, and the right and left ventricle.
In the right atrium, there's a group of cells called the pacemaker that sends a signal for the heart to contract. Heart rate is determined by this.
There are three kinds of blood vessels and they are the arteries, capillaries, and the veins.
The arteries carry blood away from the heart.
Arteries begin at the aorta which is the largest artery in the body.
They carry oxygenated-rich blood and nutrients away from the heart to all the body’s tissues.
From the arteries, blood flows from tiny vessels called the capillaries.
Capillaries are connected to the arteries and the veins and their thin walls allow oxygen, nutrients, and carbon dioxide to pass from the tissue cells.
From capillaries, blood flows into veins, which carry blood back to the heart.
Veins take oxygen-poor blood back to the heart. through the vena cava, which is a large vein carrying deoxygenated blood into the heart.
And heres an animation of a typical human red blood cell cycle in the circulatory system. This animation occurs at real time (20 seconds of cycle) and shows the red blood cell deform as it enters capillaries, as well as changing color as it alternates in states of oxygenation along the circulatory system.
All blood enters the right side of the heart through the two veins, the superior vena cava and the inferior vena cava.
When the left atrium contracts, blood travels through the mitral valve and into the left ventricle (the left ventricle is an important chamber which pumps blood into the aorta, the main artery in the body, It receives all the blood the heart has pumped out and gives it to the rest of the body).
Blood now returns to the heart from the lungs by the way of the pulmonary veins and goes into the left atrium.
When the right ventricle contracts, blood is pumped through the pulmonary artery and into the lungs where it picks up oxygen.
Blood leaves both superior and inferior cava’s and enters the right atrium and into the right ventricle.
The superior vena cava collects blood from the upper half of the body, while the inferior vena cava collects blood from the lower half of the body.
Maryam. J // Talaah. A