SCIENCE CHAPTER 11 TRANSPORTATION IN ANIMALS AND PLANTS CLASS 7 NCERT
WRITE THE SHORTNOTES
plz answer as fast as you can and plz don't give me wrong answers or I will report it
Answers
Answer:
1) The blood vessels are the components of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away from the tissues.
2) The arteries are the blood vessels that deliver oxygen-rich blood from the heart to the tissues of the body. Each artery is a muscular tube lined by smooth tissue and has three layers: The intima, the inner layer lined by a smooth tissue called endothelium.
3) Veins are the blood vessels which carry blood from all the parts of the body back to the heart. ... The main vein carries deoxygenated blood from all the parts of the body (except lungs) back to the heart. Another vein called pulmonary vein is connected to the left atrium of the heart.
4) Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.
5) The pulmonary arteries carry deoxygenated blood to the lungs, where carbon dioxide is released and oxygen is picked up during respiration. Arteries are further divided into very fine capillaries which are extremely thin-walled. The pulmonary vein returns oxygenated blood to the left atrium of the heart.
6) The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart. The largest pulmonary veins are the four main pulmonary veins, two from each lung that drain into the left atrium of the heart. The pulmonary veins are part of the pulmonary circulation.
7) The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs.
8) The human heart pumps about 5 litres of blood per minute. ... As the blood is pumped b the ventricles into the arteries with force, a wave of expansion passes along the arteries. This recorded in order to know the heartbeat. The pulse rate is the same as the rate of heartbeat, i.e., 70-72 per minute.
9) Pulse rate is the number of heartbeats per minute. The resting pulse rate for an average adult is between 60 and 80 beats per minute.
Hope it helps you.....
I am also in 7th class.
Answer:
blood vessels =Blood vessels flow blood throughout the body. Arteries transport blood away from the heart. Veins return blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen.
arteries=Arteries carry blood away from the heart. Pulmonary arteries transport blood that has a low oxygen content from the right ventricle to the lungs. Systemic arteries transport oxygenated blood from the left ventricle to the body tissues.
veinsVeins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.