Tag: respiration and associated structures
Questions Related to respiration and associated structures
Thoracic cavity is enlarged by contraction of
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Internal Intercostal muscles
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Diaphragm
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Lungs
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All of above
The diaphragm functions in breathing. During inhalation, the diaphragm contracts and moves in the inferior direction, thus enlarging the volume of the thoracic cavity (the external intercostal muscles also participate in this enlargement). This reduces intra-thoracic pressure.
Lungs ventilation movements is due to
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Costal muscle and diaphragm
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Costal muscle
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Diaphragm
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Wall of the lungs
Breathing involves two stages, inspiration during which atmospheric air is drawn in and expiration by which the alveolar air is released out. The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere. Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure. Similarly, expiration takes place when the intra-pulmonary pressure is higher than the atmospheric pressure. The diaphragm and a specialised set of muscles external and internal intercostals between the ribs, help in generation of such gradients.
Hiccough (hiccup) is due to activity of
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Intercostal muscle
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Food in air tract
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Diapharagm
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Inadequate oxygne in environment
- A hiccup is an involuntary contraction of the diaphragm involving a reflex arc, that may repeat several times per minute.
- Once triggered, the reflex causes a strong contraction of the diaphragm followed by about 0.25 seconds later by closure of the vocal cords, which results in the classic "hic" sound.
- Hiccups may occur individually, or they may occur in bouts.
Which of the following structures are responsible for breathing process?
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The trachea and alveoli
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Larynx and bronchi
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Ribs and intercostal muscles
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Intercostal muscles and diaphragm
Breathing or pulmonary ventilation is a process where the nasal and oral cavities inhaled the air and enter into the lungs through the pharynx, larynx and trachea. Air is also exhaled through the same pathway. While larynx, pharynx and trachea are involved the changes to the volume and air pressure in the lungs trigger breathing. During the process of inhalation, the diaphragm and external intercostal muscles contract thereby elevating the rib cage. With the increase in the volume of the lungs, air pressure drops letting the air rush in. Similarly, during exhalation, the muscles relax letting the lungs become smaller, which raises the air pressure and helps to expel the air.
The exhaled air mainly contains
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Oxygen
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Carbon dioxide
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Nitrogen
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None of the above
Exhalation is a process to breath out.carbon dioxide is a waste product in the body that release out during exhalation, it is also saturated with water vapor.
Rita breathes out on a mirror and finds water droplets on it. This activity helps to conclude the fact that
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Inhalation is faster than exhalation
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Water vapour is released during breathing
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Exhalation is faster than inhalation
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Both A and B
Carbon dioxide is released in the process of exhalation in large amount.$CO _2$ dissolves in water and can easily and reversibly form compounds such as carbonic acid and bicarbonates. when it is released out, it is saturated with water vapour and this is the reason for water droplets in the mirror.
In mammals, the body cavity is partitioned into thoracic and abdominal parts by.
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Liver
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Lungs
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Ribs
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Diaphragm
Forced deep breathing during rest for some time is followed by temporary stoppage of breathing because of.
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Little $CO _2$ in blood
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High $CO _2$ content in blood
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High oxygen content in blood
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Little oxygen content in blood
To generate pressure gradients for faciliatating expiration and inspiration, the human body uses the intercostal muscles and.
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Alveolar sacs
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Bronchi
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Primary, secondary and tertiary bronchioles
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Diaphragm
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Wind pipe
Increase in $CO _2$ concentration shall cause.
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Slower and shallower breathing
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Slower and deeper breathing
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Faster and deeper breathing
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No effect on breathing