Blood is a liquid combination of plasma and cells that float in it. It is a specialized body fluid that delivers essential substances and nutrients, such as sugar, oxygen and hormones to our cells, and carries waste away from those cells. These wastes are removed from the body in urine, feces, sweat and lung also contains coagulating agents.
Types of Bloods:
Red blood cell: It is also known as RBC or Erthrocytes.RBC has a life span about 4 months.
White blood cell: It is also known as WBC or Leukocytes.WBC contains two types of cells called as Lymphocytes and Ganulocytes.
platelets: It is also called as Thrombocytes.It is involved in clotting of blood.
Facts about Blood:
Around 8% of an adult’s body weigh is made up of blood.
Females have 4 to 5 liters and males have 5 to 6 liters.
Its mean temperature is 38 degrees Celsius.
It has a pH of 7.35 to 7.45,making it slightly basic (less than 7 is considered acidic).
Whole blood is about 4.5 to 5.5 times as viscous as water, it is more resistant to flow than water.
Blood in the arteries is a brighter red in colour than blood in the veins because high level of oxygen found in the arteries.
Functions of Blood:
Blood has 3 main functions named as transport, protection and regulation.
Blood is the primary means of transport in the body that is responsible for transporting nutrients and important materials to and from the cells and molecules that make up our body. It is the blood's duty to first take the oxygen processed by the lungs to all the cells of the body and then collect the carbon dioxide from the cells and deliver it to the lungs.It also takes care of the task of collecting metabolic waste from top to bottom of the body and carry it to the kidneys for excretion.
Blood carries out the important task of protecting the body from the threat of infections and diseases that cause bacteria. The white blood cells found in the blood are responsible for safeguarding the different organs of the body by producing antibodies and proteins that are capable of fighting and killing germs and viruses that can cause serious damage to body cells. Platelets in the blood drive the task of limiting blood loss after injury by helping blood to clot quickly.
Blood helps to regulate pH by interacting with acids and bases. Water balance by transferring water to and from tissues
What does Blood do?
Blood supplies oxygen to cells and tissues.
Blood has cells such as platelets, which help the blood to coagulate when it is bleeding.
white blood cells have antibodies which defend us from infection and foreign bodies.
Blood removes waste products like lactic acid and urea.
Blood supplies essential nutrients to the cells such as glucose.
Blood regulates our pH levels.
Blood also regulates body temperature according to the weather or during exercise there will be high blood flow to the surface, resulting in warmer skin and faster heat loss.
Composition of Blood:
Blood is classified as connective tissue and consists of two main components:
Plasma and Formed elements
Plasma is a clear extracellular fluid
Formed elements are made up of the blood cells and platelets, formed elements are are enclosed in a plasma membrane and have a definite structure and shape. All formed elements are cells except for the platelets, which are tiny fragments of bone marrow cells.