Ch-10 Questions 21-40

Respiration in Organisms

Sr NO.	Question	Answer
21.	Why one get muscle cramps after heavy exercise?	The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps.
22.	Why we get relief from cramps after a hot water bath or a massage?	Hot water bath or massage improves circulation of blood. As a result, the supply of oxygen to the muscle cells increases. The increase in the supply of oxygen results in the complete breakdown of lactic acid into carbon dioxide and water.
23.	How long we can live both nostrils and mouth closed?	We cannot survive for long without breathing.
24.	What breathing means?	Breathing means taking in air rich in oxygen and giving out air rich in carbon dioxide with the help of respiratory organs.
25.	What is inhalation?	The taking in of air rich in oxygen into the body is called inhalation.
26.	What is exhalation?	Giving out of air rich in carbon dioxide is known as exhalation.
27.	What is breathing rate?	The number of times a person breathes in a minute is termed as the breathing rate. During breathing inhalation and exhalation take place alternately.
28.	What does a breath means?	A breath means one inhalation plus one exhalation.
29.	Whether duration of a breathe is constant or changes?	Duration of breathe changes according to the requirement of oxygen by the body.
30.	How many times we breathe in and breathe out in a minute?	On an average, an adult human being at rest breathes in and out 15-18 times in a minute.
31.	How breathing rates changes whenever a person needs extra energy? What happens in our body then?	He/She breathes faster. As a result more oxygen is supplied to our cells. It speeds up the breakdown of food and more energy is released.
32.	What is the rate of breathe per minute in an adult at rest?	On an average, an adult human being at rest breathes in and out 15-18 times in a minute.
33.	What is the rate of breathe per minute in an adult during heavy exercise?	Breathing rate can increase up to 25 times per minute. While we exercise, not only do we breathe fast, we also take deep breaths and thus inhale more oxygen.
34.	Arrange the following activities in ascending order of breathe rate:-	Walking, Climbing, running, washing, studying, sleeping. Sleeping, studying, washing, walking, climbing, running.
35.	Represent a diagram depicting the movement of air when we inhale.	Nostrils --> Nasal Cavity --> Windpipe --> Lungs
36.	During inhalation what happens in the Chest Cavity?	During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air.
37.	During exhalation what happens in the Chest Cavity?	During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs.
38.	What are the things found in the air we breathe? What happens to avoid unwanted things entering into our body while breathing?	The air around us has various types of unwanted particles, such as smoke, dust, pollens, etc. When we inhale, the particles get trapped in the hair present in our nasal cavity.
39.	How our body expel unwanted articles entered in the nasal cavity?	Sometimes unwanted particles may get past the hair in the nasal cavity. Then they irritate the lining of the cavity, as a result of which we sneeze. Sneezing expels these foreign particles from the inhaled air and a dust free, clean air enters our body.
40.	When we blow on a lime solution, what change would occur in the appearance of lime water?	It turns the color of lime water into milk white.
41.	Explain the cause of change in appearance in lime water when we blow on lime water solution.	It turns the color of lime water into milk white.