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प्रश्न
Explain the structure and function of human blood.
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:
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It transports nutrients and oxygen to the different parts of the body.
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It also carries waste materials (from the different parts of the body) to be removed by the excretory organs.
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Chemical messengers like hormones are transported by the blood.
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Protects the body from disease-carrying germs.
- Helps to maintain a constant body temperature.
संबंधित प्रश्न
the Biological/technical term for Blood vessels carrying blood to the left atrium.
What are the average values of blood pressure in a normal adult human?
A blood vessel which has small lumen and thick wall is ______.
what is Venule?
Give reason for the following:
Blood flowing away from the stomach and intestines is put into circulation via the liver and
not directly.
The table below is designed to indicate the transport of certain substances in our body. Fill in the blanks with suitable answers.
| Substance | From | To | |
| 1. | ______ | Lungs | Whole Body |
| 2. | Carbon Dioxide | ______ | ______ |
| 3. | Urea | ______ | ______ |
| 4. | Digested Carbohydrates | Intestines | ______ |
| 5. | ______ | ______ | Target Organs |
| 6. | Heat | ______ | Whole Body |
Draw well labeled diagrams of part Artery and Superior vena cava to show the structural.
Which of the following correctly represents the components of blood?
Given below are four statements regarding human blood circulatory system:-
- Arteries are thick walled and have narrow lumen as compared to veins.
- Angina is acute chest pain when the blood circulation to the brain is reduced.
- Persons with blood group AB can donate blood to any person with any blood group under ABO system.
- Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?
Mention the phase of heart beat in which both the atrio-ventricular valves are closed.
