Arteries and Veins
Arteries and Veins
Three types of blood vessel namely, arteries, veins and capillaries are involved in blood circulation. They are all connected to form one continuous closed system.
1. Arteries: These are wide, elastic and thick walled vessels as they carry blood away from the heart to the limbs and organs of the body. They have thick, elastic walls to withstand the high pressure of the blood emerging from the heart.
2. Veins: These bring blood from the tissues and organs to the heart. The blood in veins flow under less pressure than that in arteries. Therefore, veins do not have thick walls. But veins can accommodate more blood. Veins have valves that allow blood to flow in one direction only.
3. Capillaries: Arteries branch out into smaller and thinner blood vessels called arterioles. These divide into still smaller vessels to provide blood to all the cells. The thinnest blood vessels are called capillaries. Their walls have just one layer of squamous cells. These walls are permeable, so water and dissolved substances pass in and out, exchanging oxygen, carbon dioxide, dissolved nutrients and waste products with the tissues around the capillaries. These capillaries form a dense network, reaching out to every part of the human body. The flow of blood is slow in capillaries.
|
Arteries |
Veins |
|
1. They carry blood away from the heart. |
They carry blood to the heart. |
|
2. They are thick walled tubes. |
They have thinner walls. |
|
3. They are deeply placed under the skin, and blood moves under high pressure. |
They are superficially placed and blood does not move under pressure. |
|
4. There are no valves inside arteries. |
There are a series of valves present in the veins. These prevent the blood from flowing back to the organs. |
Which of the following are correct ? (a) Arteries are wide, elastic and thick walled vessels as they carry blood away from the heart to the limbs and organs of the body. (b) Veins have valves that allow blood to flow in one direction only. (c) The walls of the capillaries are so thin that diffusion of gases and chemical substances takes place very easily. | |||
| Right Option : D | |||
| View Explanation | |||
The pure, oxygenated blood, rich in nutrients are carried by the ___________________ | |||
| Right Option : B | |||
| View Explanation | |||
The impure, deoxygenated blood, rich in waste materials is carried by the ________________ | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
