Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A healthy human breathes at an average rate of:
The NCERT states, 'On an average, a healthy human breathes 12-16 times/minute.'
Which of the following correctly represents Inspiratory Capacity (IC)?
According to the NCERT, 'Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume (TV+IRV).'
The thoracic chamber is described as anatomically an air-tight chamber. Which structures form its dorsal and ventral boundaries, respectively?
The NCERT states, 'The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm.'
What is the approximate volume of air inspired or expired during a normal respiration for a healthy human?
The NCERT text defines Tidal Volume (TV) as 'Volume of air inspired or expired during a normal respiration. It is approx. 500 mL.'
If a person has a Tidal Volume (TV) of 500 mL and an Inspiratory Reserve Volume (IRV) of 2800 mL, what is their Inspiratory Capacity (IC)?
As per the NCERT, 'Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume (TV+IRV).' So, IC = 500 mL + 2800 mL = 3300 mL.
The lungs are situated in the thoracic chamber, and any change in the volume of the thoracic cavity is reflected in the lung (pulmonary) cavity. This arrangement is crucial because:
The NCERT explicitly states, 'The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity. Such an arrangement is essential for breathing, as we cannot directly alter the pulmonary volume.'
Which of the following steps is NOT considered part of the 'Mechanism of Breathing' as described in the NCERT context for human respiration?
The section '14.2 MECHANISM OF BREATHING' states, '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.' The 'Diffusion of gases (O2 and CO2) across alveolar membrane' is listed as a separate step in 'Respiration involves the following steps' but not as part of the 'Mechanism of Breathing' itself, which focuses on ventilation.
What is the term for the total volume of air a person can expire after a normal inspiration?
The NCERT states, 'Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV).'
During normal expiration, the diaphragm and inter-costal muscles:
The NCERT states, 'Relaxation of the diaphragm and the inter-costal muscles returns the diaphragm and sternum to their normal positions and reduce the thoracic volume and thereby the pulmonary volume.'
Which of the following describes the volume of air inspired or expired during a normal respiration?
According to the NCERT text, 'Tidal Volume (TV): Volume of air inspired or expired during a normal respiration. It is approx. 500 mL.'
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