In this blog, we learn about Functions of Blood. It is very important & interesting topic. Blood is a connective tissue in fluid form.
It is known as “fluid of life” because it carries oxygen from lungs to all parts of the body and carbon dioxide from all parts of the body to the lungs.
It is known as “fluid of growth” because it carries nutritive substance & maintain our growth.
Blood is known as “fluid of health” because it protects our body from bacteria, virus, etc. It also transport the waste material to excretory organ like kidney.
Blood volume in adult – approx 5 litre
Blood volume in newborn – approx 450 ml
We learn functions of blood in below format. I made sequence in such a way that you will remember all 9 points easily.
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Body needs
- Oxygen – Respiratory function
- Nutrition function
- Hormones & enzymes transport
- Storage function (It maintains)
- Water balance
- Acid base balance
- Body temperature (To fights against enemy)
- Excretory function
- Defensive function
1RESPIRATORY FUNCTION
It carries oxygen from lungs to all over body & carbon dioxide from all over body to lungs. This way, it plays important role in transporting respiratory gases.
2NUTRITIVE FUNCTION
We need nutrition to survive & it is complex procedure in our body regarding this.
What we eat, it digested in gastrointestinal tract. From there blood absorbs the nutrition like glucose, amino acids, lipids, vitamins, etc.
These nutrition send to the required parts in body by blood. So, blood plays very important function of nutrition.
3TRANSPORT OF HORMONES & ENZYME
Hormones are secreted by endocrine gland like thyroid gland, pancreas, etc.
These glands releases hormone directly in the blood. The blood transports these hormones to their target organs/tissues.
Blood also transports enzyme.
4STORAGE FUNCTION
Water and many substances like glucose, proteins, sodium, potassium are constantly require to the tissue.
Blood serves as a readymate source of these substances & supply constantly.
Moreover, storage of these substances will be useful in conditions like starvation, fluid loss, electrolyte loss, etc.
5REGULATION OF WATER BALANCE
Water content of the blood is freely interchangeable with interstitial fluid. So, as per need blood can take water or remove water when needed. This helps in the regulation of water content in our body.
6REGULATION OF ACID BASE BALANCE
Plasma protein and haemoglobin asc as buffers and help in the regulation of acid base balance.
7REGULATION OF BODY TEMPERATURE
When body temperature is too low, the tiny blood vessels near the surface of the skin constrict (vaso-constriction). It decreases the blood flow near the surface of the skin so less heat is lost through radiation.
When body temperature is too high, the capillaries dilate (vasodilation), which increases blood flow near the surface of the skin and so more heat is lost through radiation.
This way the balance between heat loss and heat gain, it helps in maintaining the body temperature.
8EXCRETORY FUNCTION
What happen if waste products remains inside our body? Definitely we can not survive.
Blood carries all the waste product to the excretory organ like kidney, liver, skin, etc. for excretion.
9DEFENSIVE FUNCTION
As we all know that blood have white blood cells(WBC), which are our soldier.
Parts of WBC like neutrophil, monocytes engulf the bacteria by phagocytosis. Lymphocytes gives us immunity. Eosinophil are responsible for removes toxins & foreign protein.
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