Question

Explain the structure and function of human bodyBlood is a red colour fluid connective tissue that flows in blood vessels. It consists of two components – blood cells and plasma.

Plasma is a pale yellow colour fluid that is slightly alkaline and made up of water (~90-92%) and some 8% of dissolved nutrients, proteins, hormones and waste products.

Blood consists of three types of blood cells. These are

i. Red Blood Cells: These are small, circular, enucleated cells that contain a red pigment called haemoglobin, which helps in transporting oxygen to different cells of the body.

ii. White Blood Cells: These are large, nucleated and colorless cells that fight against germs from entering into our body and protect us from harmful diseases.

iii. Platelets: These are extremely small and disc-shaped units of blood. For example, when we get injured, the bleeding stops after some time due to the activity of platelets that helps in the clotting of blood.

Functions of blood:

It transports oxygen and nutrients to the different parts of the human body.
Blood helps in carrying waste materials from different parts of the body and removes it from our body through the excretory system.
Various chemical messengers such as hormones are transported in the body by blood.
Blood protects the body by creating antibodies that fight against disease carrying germs.
Blood helps in maintaining a normal body temperature​

Answer 1

Answer:

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Answer 2

Answer:

Blood is one of the most important components of life. Almost any animal that possesses a circulatory system has blood. From an evolutionary perspective, blood was speculated to have risen from a type of cell that was responsible for phagocytosis and nutrition. Billions of years later, blood and the circulatory system have drastically helped the evolution of more complex lifeforms.