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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
Aqueous humour, Vitreous humour, lris, Central canal
The diagram given below represents a section of the human heart. Answer the questions that follow:
- Which parts of heart are in the diastolic phase? Give a reason to support your answer.
- Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
- What causes the heart sounds ‘LUBB’ and ‘DUP’?
- Name the blood vessels that supply oxygenated blood to the heart muscles.
- Draw neat labelled diagrams of a cross section of an artery and a vein.
What are the average values of blood pressure in a normal adult human?
Draw a neat and labelled diagram.
Internal structure of the heart.
Explain the following:
Why is the closed circulatory system more efficient than the open system?
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
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 |
State the Location: Spleen
Thin tube-like structures which are the component of circulatory system are called blood vessels.
Name these:
Three components of circulatory system.
