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प्रश्न
Explain the structure and function of human blood.
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उत्तर
Blood is a fluid connective tissue that flows in blood vessels. It is composed of two components-plasma and blood cells.
Plasma is a yellowish colour fluid, made up of water (~90%) and some dissolved nutrients, proteins, hormones, and waste products.
Blood consists of three types of blood cells. These are
- Red Blood Cells: They contain a red pigment called hemoglobin, which transports oxygen to all body cells.
- White Blood Cells: They fight against germs that enter the body. Thus, they protect the body from diseases.
- Platelets: When we get injured, bleeding stops after some time. This happens because of the activity of platelets, which help in the clotting of blood.
Functions of blood:
- It transports nutrients and oxygen to the different parts of the body.
- It also carries waste materials (from the different parts of the body) to be removed by the excretory organs.
- Chemical messengers like hormones are transported by the blood.
- Protects the body from disease-carrying germs.
- Helps to maintain a constant body temperature.
संबंधित प्रश्न
Blood in the pulmonary artery or pulmonary vein (Which one contains less oxyhaemoglobin ?)
Name the following:
The valve present in between the chambers on the right side of the human heart.
How do you account for the following difference?
The walls of the right ventricle are thicker than those of the right auricle.
In which organ of our body does blood get oxygenated?
Fill in the blank:
The blood vessels which carry blood from the heart to different parts of the body are called ______.
Describe the functions of the: Blood
Name the main parts of the circulatory system
The endocrine glands produce chemical substances called ____
Label the diagram given below to show the four main parts of the urinary system and answer the following questions.
- Which organ removes extra salts and water from the blood?
- Where is the urine stored?
- What is the tube through which urine is excreted out of the body?
- What are the tubes that transfer urine from the kidneys to the urinary bladder called?
Agranulocytes are about ______ % of total WBCs.
