Grade 9 Exam > Grade 9 Videos > Biology for Grade 9 > What is the role of Blood Vessels?
What is the role of Blood Vessels? Video Lecture | Biology for Grade 9
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FAQs on What is the role of Blood Vessels? Video Lecture - Biology for Grade 9
| 1. What is the role of blood vessels in the human body? |  |
Ans. Blood vessels play a crucial role in the human body as they are responsible for the transportation of blood throughout the body. They deliver oxygen, nutrients, and hormones to the organs and tissues while removing waste products and carbon dioxide.
| 2. How many types of blood vessels are there? | |
Ans. There are three main types of blood vessels in the human body: arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart, while veins carry deoxygenated blood back to the heart. Capillaries are tiny, thin-walled vessels that connect arteries and veins, allowing for the exchange of gases, nutrients, and waste products.
| 3. What happens when blood vessels are damaged? | |
Ans. When blood vessels are damaged, the body initiates a series of responses to repair them. Platelets, tiny blood cells, form clots to prevent excessive bleeding. Once the clot is formed, a process called angiogenesis takes place, where new blood vessels are formed to heal the damaged area. This process is crucial for wound healing and tissue repair.
| 4. How do blood vessels help regulate body temperature? | |
Ans. Blood vessels play a role in regulating body temperature through a process called vasodilation and vasoconstriction. When the body needs to cool down, the blood vessels near the skin's surface dilate, allowing more blood to flow through them, which releases heat. Conversely, when the body needs to conserve heat, the blood vessels constrict, reducing blood flow to the skin's surface.
| 5. Can blood vessels become blocked or narrowed? | |
Ans. Yes, blood vessels can become blocked or narrowed due to various reasons. This condition is often referred to as atherosclerosis, where fatty deposits, cholesterol, and other substances build up on the inner walls of the blood vessels, forming plaques. These plaques can restrict blood flow, leading to serious health issues such as heart attacks or strokes.
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