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Blood is a connective tissue that is found in a fluid state in the human body. This constantly circulating fluid provides the body with oxygen, nutrients, maintains healthy pH levels and helps in waste removal. Blood is made of plasma and three different kinds of blood cells that float around in it. While one half of blood volume is composed of plasma, the other half comprises of blood cells like red blood cells, white blood cells and platelets. Around 92% of plasma is water while the rest comprises of hormones, nutrients, enzymes, salts, antibodies, proteins, gases and metabolites of different kinds.

Each one of the blood cell has a specific function: the red blood cells distribute oxygen to the tissues, the white blood cells fight infections and the platelets help in the clotting of blood. Plasma contains proteins that transport nutrients through the blood and helps the blood to clot. The blood is conducted to different parts of the body through a network of arteries and veins. Except for the pulmonary artery, the other arteries carry clean blood away from the heart to be distributed to various organs of the body. A vein on the other hand collects impure blood from various parts of the body and carries it to the heart for oxygenation.

Facts of Organ

8% of our body weight is in our blood

It has been estimated that the volume of blood in the human body is eight percent of a person’s body weight. Thus, an adult body with a weight around 700 to 80 kg will have about 4.5 to 5.6 liters of blood.

Our body has 0.2 milligrams of gold in most of which is in the blood

Our human body contains gold, but not enough to make us rich. There is approximately 0.2 mg of gold which lies diffused in our blood.

In emergencies coconut water can be used as a substitute for blood plasma

The properties of coconut water are similar to that of human blood; hence coconut water can be used as a substitute for blood plasma when nothing else is available. The fact that blood and coconut water are of similar properties makes it safe to be injected into the body.

Pregnant women have 50% more blood by week 20 of their pregnancy than they had before they conceived

At the time of pregnancy, a pregnant woman’s blood volume increases by about 50 percent to help support the growing uterus and provide blood to the placenta. Towards, the end of pregnancy, the uterus of the woman receives one­fifth of her pre­pregnancy blood supply.

Functions of Organ


Nutrients are essential elements that are required by the body to function properly. It is the primary job of the circulatory system comprising of blood to transport nutrients to different parts of the body. Blood by means of a dense network of arteries, veins and capillaries is able to achieve this function. Blood also transports the oxygenated blood to the cells of the body and collects the deoxygenated blood from the cells for delivery to the lungs.

Provides protection
Another important function of the blood is to provide the body protection from disease causing organisms. The white blood cells present in blood are tasked with the job of protecting the body. White blood cells produce protein and antibodies which fight and eliminate the organisms that try to harm the body. The platelets found in blood control blood loss in case of an injury by helping the blood clot quickly.

Blood is a regulator of many things in the body. It keeps a check on body temperature and maintains it at a level that can be tolerated by the body. Blood also controls the concentration of hydrogen ions in the body, which is known as pH balance. Another regulatory job of blood is to maintain the salt and water balance of the cells of the body. It also manages the blood pressure and restrict it to a particular range.


Constituents of blood:


Plasma, the most abundant component of blood performs a number of important functions. One of that is carrying glucose to the cells which is required for their proper functioning. The plasma also carries other nutrients like vitamins, amino acids, cholesterol, fatty acids and triglycerides. Another duty of the plasma is to maintain homeostasis and manage the functioning of the cells. Due to the presence of anti-clotting agents, plasma helps in blood clotting. It also helps the wounds heal faster. Further, plasma contains antibodies called gammaglobulins that help the body fight against infections.

White Blood Cells

White blood cells also called leukocytes are an important component of the immune system. They fight against pathogens like virus, bacteria and germs that threaten to disrupt the immune system. WBCs are formed in the bone morrow and keep circulating throughout the body to keep a check on invaders. Our immune system is dependent on WBCs to not only identify the pathogens but also to destroy and rid the body of these foreign organisms. 

Red Blood Cells

The primary job of the red blood cells is to ensure that oxygen is delivered properly to all the cells of the body. Red blood cells contain a protein called hemoglobin that is a respiratory pigment which means it can bind itself to either oxygen or carbon dioxide. In the lungs, the hemoglobin absorbs oxygen and transfers it to the rest of the body. RBCs also help in the removal of carbon dioxide from the blood. RBCs are made in the bone marrow and they live for 120 days after which they die off.


The platelets are the smallest components of blood. These tiny bits of cell float in the circulatory system alongside the RBCs and WBCs and their main job is to stop bleeding in case there is an injury to the body. When there is an injury and there is bleeding, the platelets quickly spring into action. The platelets send chemical signals to other platelets in the area and they get activated. The platelets change shape and grow small tentacles which helps them to stick together. They then form a mesh over the wound which stops the bleeding.

Food Tips


Capsicum, apart from detoxifying and purifying the circulatory system also regularizes blood pressure. It is also rich in iron which is very good for the blood.


Apples are packed with minerals, vitamins, fibers, antioxidants and phytonutrients. A compound present in apples stimulates the liver to get rid of toxins. Apples are also high in soluble pectin fibers which bind to heavy metals and cholesterol thus cleansing the blood of impurities.


Packed with antioxidants, beets are protect the body from damaging effects of free radicals and also stimulate the liver to eliminate toxins out of the blood stream. The unique mixture of compounds present in beet makes it an excellent blood purifier. Beets are high in iron thus consuming beets can help with the regeneration of blood cells and also prevent anemia.

Lentils and beans
Lentils and beans like rajma, chickpea, and green peas are rich in iron hence very good for the blood as they not only increase the RBC count but also keep the cells healthy.


Celery is an excellent blood cleanser and hence must be included in one’s diet. Celery is especially good for removing toxins present in cigarette smoke from the body. Celery possesses more than 20 anti-inflammatory substances that help the body get rid of inflammation.

Leafy Greens

Green leafy vegetables like cabbage, spinach, kale and broccoli are known to reduce blood pressure and other ailments. Leafy greens are not only filled with fiber that maintain our digestive health but the vital nutrients and minerals present in them play an important role in increasing the production of blood in the body. The presence of Vitamin C is crucial for iron absorption, thus veggies like spinach help to increase the count of RBCs. hence


Lemons are packed with antioxidants and nutrients that activate the liver to eliminate toxins. Drinking a glass of lukewarm lemon water every morning helps the body to release enzymes that convert harmful toxins into water soluble substances that are then removed through the urine. The vitamin C present in lemons is needed by the body to produce glutathione, a liver detox protein.


Blueberry is a powerful berry that has a beneficial effect on our health. They are loaded with antioxidants, possess anti-inflammatory properties and are a great blood purifier. Blueberries lessen the impact of chronic inflammation and prevent toxins from crossing the blood-brain barrier.


Avocados are an excellent food for the body considering the fact that they are incredibly nutritious and provide the body with a host of benefits. Avocadoes lower blood pressure and cholesterol and dilate blood vessels while at the same time preventing toxins from wreaking havoc. They also contain high amounts of glutathione that detoxifies the body of toxins and carcinogens.

Lifestyle Tips

Lifestyle changes:
• Try to lose weight if you are obese
• Cut back on sodium intake
• Exercise regularly
• Quit smoking and limit the intake of alcohol
• Eat a healthy diet

Diseases and Conditions


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