Home
Class 12
BIOLOGY
Among mammals, the efficiency of ventila...

Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better developed by the presence of

A

Ribs & costal muscles

B

Only ribs

C

Only costal muscles

D

Diaphragm

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about the anatomical feature in mammals that enhances the efficiency of lung ventilation compared to reptiles and birds. 2. **Analyzing the Options**: - **Option 1: Ribs and Costal Muscles**: While ribs do provide protection to the thoracic cavity and costal muscles assist in the mechanical aspect of breathing, they do not significantly enhance the efficiency of ventilation on their own. - **Option 2: Only Ribs**: This option is incorrect as ribs primarily serve a protective function rather than directly improving ventilation efficiency. - **Option 3: Only Costal Muscles**: Similar to the previous options, costal muscles alone do not account for the enhanced ventilation efficiency in mammals. - **Option 4: Diaphragm**: The diaphragm is a major muscle involved in respiration. Its contraction and relaxation play a crucial role in changing the volume of the thoracic cavity, which directly affects air intake and expulsion. 3. **Conclusion**: The diaphragm is the key anatomical feature that enhances the efficiency of lung ventilation in mammals. Its ability to contract and flatten during inhalation increases the thoracic cavity volume, allowing for greater air intake. Conversely, its relaxation helps expel air, making the breathing process more efficient. 4. **Final Answer**: The efficiency of ventilation of lungs in mammals is better developed by the presence of the **diaphragm**.
Promotional Banner

Topper's Solved these Questions

  • BREATHING AND EXCHANGE OF GASES

    MOTION|Exercise Exercise 2|48 Videos

  • BREATHING AND EXCHANGE OF GASES

    MOTION|Exercise Exercise 3|27 Videos

  • BREATHING AND EXCHANGE OF GASES

    MOTION|Exercise CHECK YOUR CONCEPTS-4|8 Videos

  • BODY FLUIDS AND CIRCULATION

    MOTION|Exercise EXERCISE -4 AIIMS | Assertion & Reason Questions|34 Videos

  • CELL CYCLE AND CELL DIVISION

    MOTION|Exercise Exercise - 4(AIIMS - 2018)|28 Videos

Similar Questions

Explore conceptually related problems

In mammals ventilation movements of lungs are governed by

The ventilation movements of the lungs in mammals are governed by

Birds are differ from mammals in presence of :-

Lung diseases are about four times more probable in urban areas as compared to rural areas . This is due to the presence of which of the following in atmosphere ?

The evidence for the origin of birds from reptiles is the presence in them of :

Reptiles, birds and_____ have lungs for the exchange of gases.

Why are reptiles, birds and mammals called amniotes?

Among the following statements, identify the ones which have made reptiles true land animals. I. The presence of horny scales, which check loss of water. II. The eggs of the rreptiles have sheels around them to check desiccation. III. They lay their eggs in wet burrows/holes. IV. The secretion of presence of a fluis-filled amnion around the ebryo in reptiles. V. They have a completely ossified endoskeleton. Which of the statemetn are true? Mark the correct code.