Advertisements
Advertisements
प्रश्न
Explain the structure and function of human blood.
Advertisements
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
Explain Diapedesis.
Mention the exact location of the Pulmonary semilunar valve
Which organ acts as a pump in the circulatory system?
Name the following:
The smallest common blood vessels formed by the union of capillaries.
Name the following:
The phase of the cardiac cycle in which the auricles contract.
Fill in the blank:
The blood vessels which carry blood from the heart to different parts of the body are called ______.
Given below is a schematic representation of the circulatory system in man. Study the same and answer the questions that follow:
(i) Label the parts 1 to 4 indicated in the diagram.
(ii) Give one difference between parts 1 and 2 based on:
(a) their structure
(b) the nature of blood flowing through them.
(iii) What is the specific name of the type of blood circulation that takes place between the heart and the lungs?
(iv) Name the valve found at the beginning of the part labeled 3.
The artificial method of filtering the blood or removing the wastes from the blood.
In which of the following process blood neutrophils play an important role?
Which component of the haemoglobin molecule combines with the oxygen molecule to form oxyhaemoglobin?
