please help with all parts. thank you! 3. Air is in the win dpipe. (cooled, warm
ID: 3507423 • Letter: P
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please help with all parts. thank you!
3. Air is in the win dpipe. (cooled, warmed) 4. Air moves from the nose to the (lungs, windpipe Answer True or False. 1. 2. When the The cells ur body need oxygen to produce energy diaphragm moves down, air is forced into the lungs. 3. Air enters the body through the ungs. Write the letter for the correct answer. 1. The body needs oxygen to make (a) blood (b) bones (c) energy 2. T he main organs of the respiratory system are the (a) )lungs (b) muscles (a)) windpipe (b) diaphragm (c) blood (a) the diaphragm (b) air (c) the nose (a) bones(b) air sacs (c) hairs (c) diaphragm 3. After the nose, the air enters the 4. The lungs are controlled by 5. The lungs are made up of many D. Answer the questions. 1. What is the job of the respiratory system? 2. What two things happen to air inside the nose? . What are the lungs made of?Explanation / Answer
3. Air is warmed in the windpipe.
Air is cleansed, warmed and moistened in the nose and airways. The warming up of air is necessary to ensure diffusion of gases and regulating the body temperature as too cool air or hot air hampers the exchange of gases. Changes in temperature of air inhaled may affect the body temperature and humans being homeothermic animals prevent this by controlling the temperature of breathed in air
4. Air moves from nose to lungs.
Air -> Nose-> Pharynx ->Trachea (windpipe)->Bronchus-> Bronchiole-> Lungs (Alveoli)
Windpipe is only in between the air way but not the final destination. Air finally moves to the lungs. When the lungs option was not present, it can be answered as Air moves from nose to pharynx. But since pharynx is not there nose is the starting point of airway the endpoint lungs should be written as it is the final destination.
B. TRUE OR FALSE:
1. The cells in your body need oxygen to produce energy: TRUE
The given statement is true as the cells use oxygen to produce energy (ATP-Adenosine Triphosphate) from food.
2. When the diaphragm moves down, air forced into the lungs: TRUE.
When diaphragm moves down, and as the diaphragm is lower border of lungs, more space is created causing the lungs to expand. So, the air is forced into the lungs due to the concentration gradient. There is low pressure in the lungs due to additional space and high pressure outside, and air is forced into the lungs due to passive diffusion from high pressure to low pressure. So, the given statement is true.
3. Air enters the body through the lungs: FALSE
Air -> Nose-> Pharynx ->Trachea (windpipe)->Bronchus-> Bronchiole-> Lungs (Alveoli)
As seen before air enters the body through nasal openings (nose) and lungs are final destination where exchange of gases occur. Hence, the given statement is false.
C. Write the letter for the correct answer:
1. The body needs oxygen to make: option c. energy
The body needs oxygen to produce energy (ATP-Adenosine Triphosphate) from food. Blood is produced through erythropoiesis which requires iron, folic acid, vitamin B12 etc. Bones require calcium, vitamin D etc. Hence, the correct answer is option c. energy
2. The main organs of the respiratory system are the: option a. lungs
Lungs are the main organs of respiratory system where gaseous exchange takes place. Muscles are involved in movement, locomotion. Diaphragm supports respiration and is considered as accessory but not important organ. Hence, the correct answer is option a. lungs
3. After the nose, the air enters the: option a. windpipe
Air -> Nose-> Pharynx ->Trachea (windpipe)->Bronchus-> Bronchiole-> Lungs (Alveoli)
Air enters through nose, then pharynx and windpipe. Since given options do not have pharynx, the next best option Windpipe is chosen. Diaphragm and blood are do not form the airway. Hence, option a is correct answer.
4. The lungs are controlled by: a. Diaphragm
When diaphragm moves down, and as the diaphragm is lower border of lungs, more space is created causing the lungs to expand. So, the air is forced into the lungs due to the concentration gradient. There is low pressure in the lungs due to additional space and high pressure outside, and air is forced into the lungs due to passive diffusion from high pressure to low pressure. When diaphragm moves upward, lungs get squeezed resulting in expiration. Hence, lungs are controlled by Diaphragm. Air moves according to the concentration gradient but donot control lungs. Nose is external opening through which air enters the body but it does not control lungs. Hence, option a. is the correct answer.
5. The lungs are made up of many: option b. air sacs.
Lungs are made up of numerous air sacs (also called as Alveoli) where exchange of gases takes place. Bones and hairs are not present in lungs. Hence, option b is correct
D. Answer the questions:
1. What is job of respiratory system?
Ans. Respiratory system helps in
2. What two things happen to air inside the nose?
Ans. Air is cleansed, warmed and moistened in the nose. Cleansed by hairs present in nose which filter the dust and mucus help in moistening and warming. Mucus in the airway also helps to entrap the dust and microbes present in the air.
3. What are lungs made of?
Ans. Lungs are made up of masses of air sacs or alveoli where exchange of gases takes places. Oxygen is taken up by the blood and carbon dioxide is expelled out.
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