Breathing vs Respiration Distinction — NEET Biology
📚 Practice ConceptAs you have read earlier, oxygen (O₂) is utilised by the organisms to indirectly break down simple molecules like glucose, amino acids, fatty acids, etc., to derive energy to perform various activities. Carbon dioxide (CO₂) which is harmful is also released during the above catabolic reactions. It is, therefore, evident that O₂ has to be continuously provided to the cells and CO₂ produced by the cells have to be released out. This process of exchange of O₂ from the atmosphere with CO₂ produced by the cells is called breathing, commonly known as respiration. Place your hands on your chest; you can feel the chest moving up and down. You know that it is due to breathing. How do we breathe? The respiratory organs and the mechanism of breathing are described in the following sections of this chapter.
Why does hyperthyroidism lead to palpitations, weight loss and muscle weakness? A. Thyroxine increases basal metabolic rate B. Heart beats faster due to adrenergic-like effects C. Proteins are broken down causing muscle weakness. D. Increased O₂ consumption strains respiratory system
View solution & NCERT explanation
Correct answer: C — a, b, c and d
Thyroxine (Ch-19) raises metabolic rate, stimulates heart (Ch-15), breaks down proteins (Ch-17), and raises O₂ demand (Ch-14).
What does NCERT say about As you have read?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.