Tag: mechanism of respiration
Questions Related to mechanism of respiration
According to Boyle's law, the product of:.pressure and volume is a constant. Hence,
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if volume of lungs is increased, then pressure decreases proportionately
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if volume of lungs is increased, then pressure also increases proportionately
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if volume of lungs is increased, then pressure decreases disproportionately
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if volume of lungs is increased, then pressure remains the same.
Which of the following is true regarding expiration?
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Exhaled air contains more moisture
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Lungs are not completely emptied even after forciful exhalation
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Exchange of gases takes place during expiration
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All of the above
- Expiration is a mechanism in which air which contains carbon dioxide release out from the lungs of the body.
- This air is dry and contains more moisture from the lungs.
- Lungs can never be empty even after force full expiration some amount of air remains in it known as residual volume.
- The exchange of gases occurs only at cellular and alveolar site, not in expiration.
During inspiration, the diaphragm
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Expands
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Shows no change
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Contracts and flattens
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Relaxed to become dome shaped
During inspiration, the diaphragm contracts and flattens to increase the volume of the the thoracic cavity. This increase in volume leads to a decrease in intra-alveolar pressure, which is a pressure lower than atmospheric pressure and creates the pressure gradient. Due to the gradient the air is from the atmosphere is forced inside the lungs through nasal cavity.
Which of the following does not happen during exhalation?
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The space in chest cavity decreases
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Diaphragm goes up
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Air is released
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Ribs are pushed upward and outward
- During exhalation diaphragm relaxes.
- The intercoastal muscles also relax.
- This makes ribs to move down and in.
- It reduces the volume of the chest cavity and the air is pushed out
In males, ______ play a role in the movement of respiratory system.
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Vertebrae
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Sternum
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Diaphragm
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Liver
The diaphragm is the muscular organ situated between the thoracic cavity and the abdominal cavity. It contracts and moves downwards due to which the volume in the lungs increases and the air is inhaled. When it relaxes, the volume of the lungs decreases and the air is expelled out.
The exchange of gases between which of the following is called external respiration?
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Lung alveoli and blood capillaries
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Lung alveoli and bronchi
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The buccal cavity and the external atmosphere
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Lung alveoli and pulmonary artery
When the gaseous exchange occurs due to a difference in the partial pressure of gases between alveoli of lungs and capillaries it is termed as an external exchange as it involves air that ix either inhaled or exhaled from the environment outside the body while when the exchange occurs between capillaries and tissue it is known as the internal exchange.
Which of the following is the correct path of oxygen in humans during inhalation?
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Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Trachea $\rightarrow$ Bronchi $\rightarrow$ Bronchiole $\rightarrow$ Alveoli
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Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Trachea $\rightarrow$ Pharynx $\rightarrow$ Bronchi $\rightarrow$ Bronchiole $\rightarrow$ Alveoli
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Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Trachea $\rightarrow$ Alveoli $\rightarrow$ Bronchi $\rightarrow$ Bronchiole
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Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Bronchi $\rightarrow$ Trachea $\rightarrow$ Bronchioles $\rightarrow$ Alveoli
Which of the following is true for $CO _2$ concentration?
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More in alveolar air than in expired
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More in expired air than in alveolar air
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More in inspired air than in alveolar air
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More in inspired air than in expired air
In the alveoli, the oxygen is continuously absorbed by the blood and CO$ _{2}$ is continuously added by the blood. So, the alveolar air has more CO$ _{2}$ concentration than the expired air.
The gas which we breath out precipitates ______ into milky white.
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Sodium Chloride solution
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Calcium Carbonate solution
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Potassium Permanganate solution
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Potassium Bicarbonate solution
The gas which we exhale or breath out is carbon-dioxide.
Inspiration occurs when
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Pressure inside lungs is lower than atmospheric pressure
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Pressure inside lungs is higher than atmospheric pressure
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Pressure inside lungs is same as atmospheric pressure
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Pressure has no effect
Air can be forced to move from one place to another by creating a pressure gradient. In the human body, the contraction of the diaphragm allows it to move down to abdomen cavity slightly. This increases the area in the thoracic cavity and the lungs expand. The intercostal muscles between the ribs also contract and allow the rib bones o come upwards and outward. Due to this, volume in the lungs increases and the pressure decreases. The pressure in the lungs is less than that of atmospheric pressure, so the air is drawn in and inspiration occurs.