How Much Blood Is In Human Body?

by | Mar 17, 2020 | Health | 0 comments

Blood Amount In Human Body

How much blood do we have?

Adult body has about 4,5 -5,5 liters of blood.

If the human body wouldn’t have blood, it would weigh 8-10% less (and wouldn’t be alive, of course).

55 kg heavy adult, blood weight is about 4,4-5,4 kg.

5-Year-old have as much blood as grown-ups. However, since children are smaller and their bones, muscles and organs doesn’t weight as much, their blood weight are proportionally bigger than adults.

However, newborn baby has close to nothing – 3 kg heavy baby has only 0,2 liters of blood.

When We are donating Our blood, taken is only 0,5 liters of blood. Blood cell life cycle is 120 days, in bone marrow the hematopoietic process is constantly ongoing.

However, it never stops, cell rejuvenation requires time, therefore, We can’t donate blood every day.

Did You know that when We are donating blood at one time are taken 8% of total blood volume.

We recommend donating blood in set intervals – wait till blood is recovered (4-6 weeks).

In adult blood about 3 liters are plasma, erythrocytes (red blood cells), leukocytes and lymphocytes (white blood cells) and platelets.

Vitamins, electrolytes and other nutrients dissolve in blood and they are absorbed by organism cells and organs.

Human blood comprises 0,02% gold. However, iron in our bodies is significantly more (3-4 grams).

Blood pH

Normal Blood pH and what can change it?

pH is how we measure level of acidity or alkaline something is. pH levels in the body needs to be just right in order for it to work properly.

We measure the pH level in a scale from 0 to 14. pH 7 is neutral just like water.

Each next level is 10 times higher than the previous one. For instance, pH of 10 is exactly 10 times more alkaline than a pH of 9. pH of 3 is 10 times more acidic than a pH of 4.

Normal Blood pH

Blood by default is slightly alkaline. Normal blood pH ranges from 7,35 – 7,45 pH. To compare, stomach acid pH ranges from 1,4 – 3,4 pH. Therefore, stomach acid is acidic, as the name suggests.

Low pH in stomach acid guarantees good food digestion.

How Does Blood pH Change?

Certain health conditions can because of normal blood pH change. Such as,

  • Infection
  • Gout
  • Hemorrhage
  • Shock
  • Drug Overdose
  • Poisoning
  • Lung Disease
  • Kidney Disease
  • Diabetes
  • Asthma

 Normal Blood pH Balance

When blood becomes too acidic (below 7,35 pH), this state we call Acidosis. When blood pH gets higher than 7,45 pH, then it’s called Alkalosis (it becomes too alkaline).

The balance of pH maintains 2 major organs – Lungs and Kidneys.

  • Lungs. One of the function is to remove carbon dioxide through breathing.
  • Kidneys. Removes acids through urine.

Two main causes of acidosis and alkalosis is:

  1. Respiratory Type. Change in normal blood pH is caused by breathing or lung condition.
  2. Metabolic Type. Occurs when pH changes are caused by kidney condition.

How Can I Test Blood pH?

Blood pH tests are part of any regular blood gas test or arterial blood gas test. These tests measure oxygen and carbon dioxide in your blood.

If You have health condition, then Your health specialist will test it for You. Blood tests require taking your blood through needle procedure.

Taken blood sample then is sent to lab and tested

Blood pH Changes

Heightened blood pH levels. As stated above, this is called Alkalosis and it happens when it is higher than normal range. Variety of things can cause it.

Health Condition can raise pH.

  • Kidney Problems. When kidneys are not working properly, balance of pH is disrupted. Often, kidney problems lead to high blood pH. It happens when the body doesn’t remove alkaline substances through the urine. However, you can help to lower pH through various medications.
  • Fluid Loss. Dehydration can increase blood pH. When we lose blood electrolytes (salts and minerals) along with the water loss. Such as sodium and potassium. Fluid Loss happens through sweating, vomiting, diarrhea. To fix this, you will have to intake more fluids. Isotonic sports rinks might help, however they are high in sugars, so be careful with that!

Low Blood pH

Blood acidosis affect your inner organs and their functionality. However, low blood pH is more of a problem than high blood pH.

Natural acids can build up from certain health condition. Acids that lower blood pH are –

  1. Keto acids
  2. Phosphoric acid
  3. Carbonic acid
  4. Hydrochloric acid
  5. Sulphuric acid
  6. Lactic acid

Diabetic Ketoacidosis

Diabetic patients have a risk of acidic blood, if blood sugar levels are not managed.

Diabetic Ketoacidosis is when the body can’t produce enough insulin or use it as it should.

Insulin assists with sugar transfer from food you eat to your cells. These sugars are used as energy source for your body.

However, if insulin can’t be used, body starts breaking down stored fats. As a result, acid waste is created called “ketones”. As the acid builds up, low blood pH is triggered.

In case of symptoms, seek medical help:

  • Stomach pain
  • Confusion
  • Smelling Breath
  • Can’t breathe normally
  • Vommiting
  • Feeling of weakness or fatigue
  • Dehydration
  • Urinating too often

If Diabetic Ketoacidosis is diagnosed, it’s a sign that your diabetes is not taken care of.

To balance Your pH of the blood, You will have to treat diabetes appropriately.

  1. Insulin Injections;
  2. Daily Medication;
  3. Healthy Lifestyle, such as, diet and physical activity

Metabolic Acidosis

Kidney failure or disfunction can cause low blood pH. This is called Metabolic Acidosis.

As a result, kidneys can’t eject acid from body properly. Blood acids rises, therefore lowering blood pH.

Symptoms of Metabolic Acidosis are:

  • Heavy Breathing
  • Vomiting
  • Headache
  • Loss of Appetite
  • Fatigue or Weakness
  • Fast Heartbeat

To treat kidney disorders you will have to take medications. If that doesn’t work, you will most likely need a kidney transplant. Read more on National Kidney Foundation website.


Respiratory Acidosis

Blood pH is lowered as a result when lungs doesn’t work properly. Respiratory Acidosis is caused when lungs can’t move enough carbon dioxide out of the body.

Cause can be serious lung condition, such as:

  • Diaphragm Disorders
  • Pneumonia
  • Bronchitis
  • Sleep Apnea
  • Asthma

Normal Blood Pressure

One of the most common health problems related to heart and blood vessels is high blood pressure.

This is why health checks are necessary. If You don’t know what is the condition, it may be harmful to Your health.

Health checks are necessary because high blood pressure symptoms are very hard to notice.

Often people are not even aware of the things that can raise blood pressure. Such as diet and physical activities (or lack of them).

What Is Blood Pressure?

Heart is an organ that constantly pumps blood into your organs and tissues. Blood gets pumped from the left side of the heart into the arteries.

Arteries are blood vessels that carry blood’s oxygen and nutrients to the body.

In the process of blood pumping into arteries, it pushes against the artery walls.

Measurement of the pressure of the blood in artery is called – Blood Pressure.

Blood pressure is at the highest when blood muscle contracts and pumps blood. That process is called systole.

When heart relaxes and refills with blood, it is called – diastole. Systole is the top number and diastole is the bottom.

It is displayed like this 120/80 mmHg.

Normal Blood Pressure

As mention above 120/80 mmHg is optimal rating. Your normal blood pressure will be clear based on the circumstances you are in. Consult Your doctor if you are not sure.

High Blood Pressure

140/90 mmHg is considered high blood pressure. Such a condition is dangerous to health.

If blood pressure is high, heart and arteries become overloaded. High blood pressure can accelerate atherosclerosis.

Atherosclerosis is when plaque builds up on artery walls. Disrupting blood flow to the heart muscle, making individual prone to heart attacks.

By weakening arteries’ walls in the brains, stroke also is possible. Long-term high blood pressure is known as hypertension and its main cause of heart diseases.

What Causes High Blood Pressure?

There are a lot of different factors that can affect your blood pressure throughout the day.

It is normal for blood pressure to go up and down throughout the day. It can be affected by simple things like sleep, food you ate, emotions, stress.

After You have rested, it should go back to normal. However, there are factors that can cause high blood pressure, such as:

  • Smoking
  • Old Age
  • Being Overweight
  • Stress
  • Family History of High Blood Pressure
  • Lack of Physical Activity
  • Drinking Too Much

Taking Care Of High Blood Pressure

High blood pressure can be prevented by making right life choices. Healthy life choices are such as:

If it is not enough – consult with your doctor. Perhaps You need medication after all.

How To Know If My Blood Pressure Is Normal?

Take Your blood pressure constantly. It is not hard to do.

If You haven’t taken blood pressure lately, go and make an appointment.

Blood Type

Blood Types

Blood type is determined by certain antigens that are present or absent in the blood.

Antigens are substances that can trigger immune response if they are foreign to the body.

Some antigens can trigger the immune system to attack the transfused blood. To transfer blood safely, it depends on careful blood typing and cross-matching.

There are 4 big blood groups determined by the antigen’s presence or absence. Antigens are called A and B, furthermore there is protein called Rh factor.

Rh factor can be present (+) and absent (-).

How Is My Blood Determined

It is inherited from your parents. Blood type is genetically passed down.

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