October 21, 2020

Human Circulation System

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Human Circulation System Notes PDF- Hello Aspirants, welcome to our site sarkarirojgarhelp.com Today, we are providing you human circulation system Short notes PDF which help you to understand this topic for competitive exams.

In short, we will say that this topic is very interesting because in this topic we learn about function of human circulation system in our body, how blood circulated and pumped into body of human being. Therefore, we will be providing you human circulation system notes PDF by that you can easily understand this topic.

Human Heart:

  • Biological term for the heart is ‘Cardio’ and study of heart is called ‘Cardiology’.
  • The male heart weighs about 300 grams approximately, and the female heart about 250 grams.
  • The major function of the heart is circulation and pumping of blood through the body.
  • It is a pumping organ works in a rhythmic cyclic manner with a systole (shrinkage for 0.3 sec) and a diastole (expansion for 0.5 sec).
  • A heartbeat lasts for 0.8 seconds and consists of both of these.
  • The heartbeat of a normal person is 72 beats/minute.
  • The shrew has one of the highest Heart Rate i.e. 800 beats per minute.

Anatomy of the Human Heart:

structure of chambers of the heart

Human Circulation System
  • The human heart has four chambers.
  • The myocardium is the muscular substance of the heart.
  • The middle of the three layers forming the outer wall of the human heart.
  • The membrane which covers heart is called Pericardium, it protects the heart.
  • There are two upper chambers (anterior) in the heart, the right and left atrium.
  • There are two lower chambers (posterior) in the heart, the right and left ventricle.
  • Inter ventricular Septum is the stout wall separating the lower chambers (the ventricles) of the heart from one another.

Heart chambers and valves

Valves:

  • Cardiac (Heart) Valves are any of the heart valves that work together to regulate the flow of blood through the chambers of the heart.
  • There is a tricuspid valve between the right atrium and the right ventricle.
  • There is a bicuspid valve between the left atrium and left ventricle.

Vein:

  • Veins are the blood vessels that carry blood to the heart in an even flow.  They have thin walls, large lumens, and valves.
  • Veins contain impure blood i.e. carbon dioxide mixed blood.
  • The pulmonary vein is an exception as it always carries pureblood.
  • The pulmonary veins carry oxygenated blood from the lungs to the heart, which then flows through the body.
  • Vena Cava is a large vein which returns blood from the head, neck, and extremities to the heart.
  • Superior Vena Cava is a large vein that carries blood from the head, neck, arms, and chest to the heart.

Artery:

  • The artery is the vessel which carries blood from the heart towards the body.
  • Artery contains pure blood i.e. oxygen mixed blood.
  • The pulmonary arteries are an exception, as they always carry impure blood or deoxygenated blood.
  • Aorta is the largest artery in the body. It carries oxygen-rich blood away from the heart to vessels and then reach the rest of the body.
  • The artery which carrying blood to the muscles of the heart is called the coronary arteries. Any type of hindrance in it can cause a heart attack.

Blood Circulation System:

  • Lungs are a pair of organs in Thoracic cavity, and also called chest cavity, which supplies the body with oxygen and removes carbon dioxide from the body.
  • Capillaries are the smallest body’s blood vessels.
  • Oxygen and glucose pass through capillary walls and enter the blood cells.
  • Waste products such as carbon dioxide pass back from the cells into the blood through capillaries.
  • Endothelium is the innermost layer of blood vessels that consists of just a single layer of cells.
Human Circulation System

Pulmonary Circulation:

  • Pulmonary Circulation means circulation of the blood through the lungs.
  • The human heart can pump 70 ml blood in one cycle.
  • Impure blood is present in the right heart chamber i.e. carbon dioxide mixed with blood.
  • Pure blood is present in the left heart chamber i.e. oxygen mixed blood.
  • Pulmonary Artery and its branches deliver blood rich in carbon dioxide (and lacking in oxygen)
  • to the capillaries that surround the air sacs.
  • Pulmonary Veins return the oxygenated blood from the lungs to the left atrium of the heart.

Interested Candidates can download Biology Circulation System Notes PDF from the below available link.

Human Circulation System

Human Circulation System Notes PDF – Download Here

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