Post category:Biology MCQs / PMS MCQs Post comments:0 Comments Presence of cartilaginous rings in respiratory tract sct as: A. Support B. Keep passage open C. Prevent collapsing D. All of the above Read more articles Previous PostThe distribution of air into lungs is controlled by: Next PostMajor contribution in inhalation by: You Might Also Like The principal constituent of the atmosphere of the Earth is____________. June 19, 2022 The fish that has four hearts,one nostril,no jaws and no stomach is—–? September 18, 2021 Which cells have least regeneration capacity? September 10, 2020 Public administration refers to? June 20, 2022 She was absent _____ the class. November 14, 2021 The lifespan of White Blood Cells is __________ days. June 19, 2022 Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment. Δ