Question
2.During inhalation, the diaphragm is contracted which increases the volume of the lungcavity. During exhalation, the diaphragm is relaxed which decreases the volume of thelung cavity. The given graph is related to the changes in the volume of lungs of a person at a rest over a period of 20 seconds.
(ii)Which of the following muscles help during inhalation. (a) External intercostal muscles (b) Internal intercostal muscles (c) Both (a) and (b (d) None of these
in progress 0
3 years 1 Answer 8 views Enlightened 0

Question
2.During inhalation, the diaphragm is contracted which increases the volume of the lungcavity. During exhalation, the diaphragm is relaxed which decreases the volume of thelung cavity. The given graph is related to the changes in the volume of lungs of a person at a rest over a period of 20 seconds.
(i) How many breaths per minute is the person taking when at rest? (a) 15 (b) 15 (c) 17 (d) 20 It is clear from the given graph that the person is taking 5 breaths per 20 sec,so in 1
in progress 0
3 years 1 Answer 39 views Enlightened 0

Question
1.The tubes – blood vessels – Arteries are the vessels which carry blood away from the heart to various organs of the body. Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls. Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction. On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one- cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place across this thin wall. The capillaries
(iii)After entering into the tissues, the arteries are divided into a)aorta (b)atrium (c)capillaries (d)veins
in progress 0
3 years 1 Answer 4 views Enlightened 0

Question
1.The tubes – blood vessels – Arteries are the vessels which carry blood away from the heart to various organs of the body. Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls. Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction. On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one- cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place across this thin wall. The capillaries
ii)The blood vessel which carries oxygenated blood from the lungs to the heart is : a)main artery (b)pulmonary artery (c)main vein (d)pulmonary vein  
in progress 0
3 years 1 Answer 7 views Enlightened 0

Question
i)A blood vessel which carries blood back to the heart is : a)artery (b)vein (c)capillary (d)platelet
in progress 0
3 years 1 Answer 8 views Enlightened 0