The Circulatory System — Flashcards
ICSE · Class 8 · Biology
42 flashcards for The Circulatory System (ICSE Class 8 Biology) to test yourself on key terms and facts. Sample: "What is the circulatory system?"
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What is the circulatory system?
Answer
The circulatory system is the transport system of the body. It carries nutrients, oxygen, carbon dioxide, and waste materials through the blood and lymph.
What are the main parts of the human circulatory system?
Answer
The main parts are the heart, blood, and blood vessels. Blood moves through the body with the help of the heart as a pumping organ.
What is blood?
Answer
Blood is a body fluid that flows in the heart and blood vessels. It carries oxygen, nutrients, carbon dioxide, and other materials throughout the body.
What is tissue fluid?
Answer
Tissue fluid is the fluid that fills the spaces between body cells. It is also called interstitial fluid or intercellular fluid. It is formed when plasma and leukocytes leak from capillaries.
What is lymph?
Answer
Lymph is the fluid found in lymph vessels and lymphatic organs. It comes from tissue fluid and contains only leukocytes, mostly lymphocytes. Red blood cells and platelets are absent.
Why is the human circulatory system called a closed vascular system?
Answer
It is called a closed vascular system because blood always flows through blood vessels and does not normally move through open spaces.
Why is the circulatory system in insects called an open vascular system?
Answer
It is called an open vascular system because the blood mostly flows through open spaces and not only through vessels.
What is the size and weight of the heart?
Answer
The heart is about the size of a folded fist and weighs about 225 to 340 grams.
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