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(b) William Harvey

Amount of water in the blood plasma is about 90%.

(b) smaller than

(c) haemoglobin

If there were no platelets in the blood, then in case of an injury, bleeding will not stop as blood clot will not be formed. It will result in death due to heavy loss of blood from body.

Function of blood:

1. It carries O₂ and CO₂ in our body.
2. Nutrient and waste product are carried by it.
3. It protects our body from disease from foreign viruses and bacterias.
4. If body gets injured it stop bleeding by making blood clots.
5. Carries antigens and antibodies.
6. Maintain the body temperature.

1. WBC
2. four
3. veins
4. lungs

WBC are called the soldiers of our body because they protect our body from disease viruses and bacteria.

(b) 72 times

Thrombocyte.

The deficiency of haemoglobin causes anaemia.

Red blood corpuscles are also known as RBC.

(d) all of these

Human heartbeats in a minute 70 times.

(b) stethoscope

The blood in liquid form Plasma.

Blood cells that protect the body from diseases WBCs.

Four chambers are there in the heart.

There are three types of blood corpuscles they are:

1. RBC or erythrocytes.
2. WBC or leucocytes.
3. Thrombocytes or platelets.

Two types of antigens. 

(a) arteries

1. Artery
2. Veins
3. Capillaries
4. Arterioles
5. Venules

(a) have valves

Blood is purified in Lungs.

(c) capillaries

(a) Blood group:
On the basis of the presence of antigens and antibodies, Karl Landsteiner had divided the human blood into four groups -A, B, AB, and O.
Human blood groups:

Importance of blood group: Due to the knowledge of blood group blood donation has been proved as a boon for the society. By this if the blood is required for the accidental victims and sick persons then blood of appropriate group could be made available by the blood banks or registered voluntary blood donors easily. They are important in the field of law and justice. By taking samples and tests of DNA, culprits could be caught. Deficiency of blood in the body is fulfilled by blood donation and given that blood to person who has deficiency.
(b) Blood Bank:
As far as possible blood should be taken from relatives but if it is not possible then blood could be receive from blood bank opened by government. In government, hospital of every district or private blood bank run by social service institution. To preserve blood in the blood bank, sodium citrate is mixed. It can be preserved for 30 days in blood banks.

Blood group AB.

O is an antigen not found in human blood.

O is a universal donor with blood group.

(d) only from ‘O’

(d) Platelets