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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
MULTIPLE CHOICE TYPE:
(Select the most appropriate option)
The valve present between the right atrium and the right ventricle is the
(a) tricuspid valve
(b) bicuspid valve
(c) semi-lunar valve
(d) mitral valve
How do you account for the following difference?
The walls of the right ventricle are thicker than those of the right auricle.
Draw a neat and labelled diagram.
Internal structure of the heart.
Which side of the heart (left or right) contains oxygenated blood?
Multiple choice questions. Tick ( ✓ ) the correct choice:
The blood vessels in which blood goes away from the heart to different body parts are
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Leucocytes show amoeboid movement.
Describe how the exchange of oxygen and carbon dioxide gases takes place in the lungs.
Analogy
Lungs: Respiratory system:: _______: Circulatory system.
Which of the following health condition refers to the type of blood cancer in which uncontrolled increase in number of WBCs occurs?
______ prevent blood clotting.
