Read the following four statements carefully.(i) Asthma is a difficult...
Asthma is a difficulty in breathing, which occurs due to inflammation of bronchi and bronchioles. Binding of oxygen with haemoglobin is primarily related to partial pressure of O2. During swallowing glottis can be covered by a thick fibrous cartilagenous flap called epiglottis to prevent the entry of food into the larynx.
View all questions of this test
Read the following four statements carefully.(i) Asthma is a difficult...
Explanation:
To determine which of the statements are correct, let's analyze each statement individually.
(i) Asthma is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.
This statement is correct. Asthma is a chronic respiratory condition characterized by inflammation and narrowing of the airways, particularly the bronchi and bronchioles. This inflammation leads to difficulty in breathing and can cause wheezing.
(ii) The part of the respiratory system starting with the external nostrils up to the terminal bronchioles constitutes the respiratory or exchange part of the respiratory system.
This statement is correct. The respiratory or exchange part of the respiratory system includes all the structures involved in the exchange of gases between the air and the blood. It starts with the external nostrils and includes the nasal cavity, pharynx, larynx, trachea, bronchi, and bronchioles up to the terminal bronchioles.
(iii) During swallowing epiglottis can be covered by a thin elastic cartilaginous flap called glottis to prevent the entry of food into the larynx.
This statement is incorrect. The epiglottis is a thin, leaf-shaped cartilage that covers the opening of the larynx (not the glottis) during swallowing to prevent food from entering the airway. The glottis, on the other hand, refers to the opening between the vocal cords within the larynx.
(iv) Binding of oxygen with hemoglobin is primarily related to the partial pressure of O2.
This statement is correct. The binding of oxygen with hemoglobin is primarily influenced by the partial pressure of oxygen (PO2) in the surrounding environment. Hemoglobin has a high affinity for oxygen when the PO2 is high, such as in the lungs, and releases oxygen when the PO2 is low, such as in the peripheral tissues.
Conclusion:
Based on the analysis above, the correct statements are (i) Asthma is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles, and (iv) Binding of oxygen with hemoglobin is primarily related to the partial pressure of O2. Therefore, the correct answer is option (d) (i) and (iv).
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.