The Rib cage expands during exhalation.
Important Questions on Respiration in Organisms
Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intrapulmonary pressure increases
Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.
Read the following statements and identify the wrong ones among them:
(i) The oral cavity leads into a short larynx, which is a common opening for food and air.
(ii) A cartilaginous flap called “epiglottis” prevents the entry of food into the glottis.
(iii) The duct of the submaxillary gland is called the “Duct of Wirsung”.
(iv) Oesophagus leads into a J-shaped bag-like structure called “stomach”.
(A) The movement of air in and out of the lungs is carried out by creating a pressure gradient between the lungs and atmosphere.
(B) Inspiration can occur if the pressure within the lungs is more than the atmospheric pressure.
(C) Expiration takes place when the intrapulmonary pressure is lesser than the atmospheric pressure.
(D) The diaphragm and a specialized set of intercostal muscles in between the ribs help in the generation of such pressure gradients for breathing.
How many of the following statements are correct?
Which of the following changes is not expected to help an individual run long distances faster at high altitudes?
