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Body Fluids and Circulation

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Body liquids are the mode of transport of supplements, oxygen and other significant substances in the body. They deliver oxygen and nutrients to the cells, and take away waste materials, which are then eliminated with urination. When the body temperature rises, blood circulation to the skin increases, enabling heat dissipation though sweating, helping to keep the body at a constant temperature. Our body have two types of fluid-

Intracellular fluid-the fluid which is present inside the cell.

Extracellular fluid– The fluid which is present outside of the cell is known ad extracellular fluid. Example ( blood, lymph, etc)


It is a liquid connective tissue made out of a liquid network, plasma and the blood corpuscles. It structures around 30-35% of the extracellular liquid. It is marginally antacid liquid having pH7.4 Blood main components are- Formed elements (erythrocytes, Leucocytes, Thrombocytes) and  Plasma (water, proteins, minerals)

Plasma is straw shaded gooey liquid that comprises 55% of blood volume. It comprises 90-92% water, 6-8% protein (fibrinogens, albumins, and globulins), glucose, amino acids, and a limited quantity of minerals like Na+, Ca++, Cl-and so forth.

Erythrocytes, leukocytes, and platelets are Formed elements. 

RBC(Red Blood Cells)

  • Erythrocytes are most abundant cells in human body. Total blood count of RBCs is 5-5.5 millions
  • Red platelets are round with a flattish, indented focus, similar to doughnuts without an opening. Your medical care supplier can keep an eye on the size, shape, and soundness of your red platelets utilizing a blood test.
  • Hemoglobin is the protein inside red platelets. It conveys oxygen. Red platelets likewise eliminate carbon dioxide from your body, carrying it to the lungs for you to breathe out.
  • Red platelets are made in the bone marrow. They commonly live for around 120 days, and afterward they bite the dust.

WBC(White Blood Cells)

Leucocytes Or WBC. 6000-8000 WBC present in each ml.

WBC are two types- Granulocytes and Agranulocytes .  they both are divided on the basis of whether the granules are present inside the WBC or not.


Granulocytes are the most well-known kind of white platelet. They contain chemical granules. At the point when contamination or aggravation enters the body, granulocytes race to the region, delivering their granules to battle disease. Granulocytes are once in a while called granular leukocytes, polymorphonuclear leukocytes or PMN.

There are three specific types of granulocytes. These are neutrophils, eosinophils and basophils

  • Neutrophils: The most widely recognized sort of granulocyte, neutrophils assault microscopic organisms. Every neutrophil cell can consume up to 20 microorganisms in the course of its life.
  • Eosinophils: These granulocytes are available in practically all safe reactions, most strikingly sensitivities. In any case, they additionally ward off parasites.
  • Basophils: These granulocytes essentially battle unfavorably susceptible responses. They discharge receptor (which accompanies allergens out of your body) and the blood more slender heparin (which forestalls thickening).

Function of granulocytes

Granulocytes cooperate to free your collection of contamination or allergens. Each sort of granulocyte has its own mix of synthetics and proteins in its granules. Therefore, each type has an alternate capacity


those don’t have granules inside them known as Agranulocyte. Monocytes and neutrophils are phagocytic cells that destroy foreign organisms. 

  • Monocytes:Monocytes are one sort of agranulocyte. They are created in the bone marrow from monoblasts. Monoblasts are created from hematopoietic undifferentiated cells. 
  • Lymphocyte:Lymphocytes are one more sort of agranulocytes. They are additionally associated with battling specific diseases and destructive cells from the body. There are two sorts of lymphocytes in the body: T cells and B cells.

Functions of agranulocytes

The capacity of agranulocytes is like that of granulocytes in that they intercede immunological reaction to unfamiliar microbes, harmful and cancer cells, and eliminate dead cells from the body. They do this by delivering antibodies and straightforwardly appending to cells as opposed to delivering granules.

How does fluid move around the body?

Water travels through semi-permeable layers of cells and starts with one compartment of the body and then onto the next by a cycle called assimilation. Assimilation is fundamentally the dissemination of water from districts of higher fixation to locales of lower focus, along an osmotic inclination across a semipermeable membrane. 

Lymphatic system

The lymphatic framework is a broad organization of vessels, hubs, and pipes that pass through practically all substantial tissues. It permits the flow of a liquid called lymph through the body likewise to blood. they help in absorbing the food from the intestine, maintain the fluid levels, and provide immunity.

Cardiac cycle

⁠The cardiovascular cycle is a sequence of alternating contraction and relaxation of the atria and ventricles in order to pumping blood throughout the body. 

Regulation of cardiac cycle

The cardio cycle has a diastolic stage ( called diastole) where the heart chamber is in a condition of unwinding and loads up with blood that gets from the veins and a systolic stage (called systole) where the heart chambers are contracting and siphons the blood towards the fringe by means of the courses. 

Autonomic and chemical regulation of heart

Pulse is constrained by the two parts of the autonomic (compulsory) sensory system. The thoughtful sensory system (SNS) and the parasympathetic sensory system (PNS). The thoughtful sensory system (SNS) delivers the chemicals (catecholamines – epinephrine and norepinephrine) to speed up the pulse. 

Cardiac disorders

Cardiovascular infections are conditions that influence the capacity of your heart, for example,

  • Unusual heart rhythms
  • Aorta sickness 
  • Innate coronary illness
  • Coronary conduit sickness
  • Cardiovascular breakdown
  • Heart muscle sickness (cardiomyopathy)
  • Heart valve sickness
  • Heart failure

Conceptual Questions

Question 1:  Which cell is known as policemen of blood? 


Monocytes are the macro policeman of blood and phagocytic in nature

Question 2: Where is RBC formed in the human body? 


The bone marrow makes RBCs. 

Question 3: Which protein is found in RBC? 


Hemoglobin is found in RBCs. 

Question 4: What do you mean by cardiac disorders? 


These are types of diseases that will affect the health of the heart and leads to improper functioning of the heart. Heart attack, heart failure, Coronary artery disease Coronary artery disease, etc. 

Question 5: What is lifespan of RBC?


RBCs live for around 120 days. 

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Last Updated : 22 Jun, 2022
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