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(i) Tidal volume is 500 ml per min (ii) ...

(i) Tidal volume is 500 ml per min (ii) The respiratory rhythm centre lies in the medulla oblongata.
(iii) The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings.
(iv) The volume of air remaining in the lungs even after a forcible expiration is functional residual capacity.
How many of the above statements are correct?

A

Two

B

Three

C

One

D

Four

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the statements provided are correct, we will analyze each statement one by one. **Step 1: Analyze Statement (i)** The statement claims that tidal volume is 500 ml per minute. - Tidal volume refers to the volume of air inhaled or exhaled during a normal breath. It is typically around 500 ml per breath, not per minute. The respiratory rate (number of breaths per minute) is usually around 14-16 breaths per minute, which means the total volume of air exchanged per minute would be around 7,000 to 8,000 ml (500 ml/breath × 14-16 breaths/min). - Therefore, this statement is **incorrect**. **Step 2: Analyze Statement (ii)** The statement claims that the respiratory rhythm center lies in the medulla oblongata. - The respiratory rhythm center is indeed located in the medulla oblongata, which plays a crucial role in regulating the rhythm of breathing. There is also a pneumotaxic center in the pons that helps regulate the rate and pattern of breathing. - Therefore, this statement is **correct**. **Step 3: Analyze Statement (iii)** The statement claims that the trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings. - The trachea and bronchi are supported by C-shaped cartilaginous rings, which are incomplete on the dorsal side. This structure prevents the collapse of the airways during expiration. - Therefore, this statement is **correct**. **Step 4: Analyze Statement (iv)** The statement claims that the volume of air remaining in the lungs even after a forcible expiration is functional residual capacity. - The volume of air remaining in the lungs after a forcible expiration is known as residual volume, not functional residual capacity (FRC). FRC is the volume of air remaining in the lungs after normal expiration, which includes both the residual volume and the expiratory reserve volume. - Therefore, this statement is **incorrect**. **Conclusion** After analyzing all four statements: - Statement (i): Incorrect - Statement (ii): Correct - Statement (iii): Correct - Statement (iv): Incorrect Thus, **2 statements are correct** (statements ii and iii). **Final Answer**: 2 statements are correct. ---
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