Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external inter - costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases
(a) Contraction of diaphragm
(b) Contraction of external inter - costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases
- (a) and (b)
- (c) and (d)
- (a), (b) and (d)
- only (d)
The Correct Option is A
Solution and Explanation
Top Questions on Mechanism Of Breathing
- Match List I with List II
List I List II A Expiratory capacity I Expiratory reserve volume + Tidal volume + Inspiratory reserve volume B Functional residual capacity II Tidal volume + Expiratory reserve volume C Vital capacity III Tidal volume + Inspiratory reserve volume D Inspiratory capacity IV Expiratory reserve volume + Residual volume
Choose the correct answer from the options given below:- NEET (UG) - 2024
- Biology
- Mechanism Of Breathing
- Vital capacity of lung is _________.
- NEET (UG) - 2023
- Biology
- Mechanism Of Breathing
- Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?
- NEET (UG) - 2019
- Biology
- Mechanism Of Breathing
- The volume of ??natomical dead space??air is normally
- WBJEE - 2012
- Biology
- Mechanism Of Breathing
- Residual volume is
- KCET - 2007
- Biology
- Mechanism Of Breathing
Questions Asked in NEET exam
- A ball of mass 0.5 kg is dropped from a height of 10 m. The ball hits the ground and rises to a height of 1.5 m. The impulse imparted to the ball during its collision with the ground is : (Take \(g = 9.8 \, \text{m/s}^2\))
- NEET (UG) - 2025
- Collision and Impulse
Consider a water tank shown in the figure. It has one wall at \(x = L\) and can be taken to be very wide in the z direction. When filled with a liquid of surface tension \(S\) and density \( \rho \), the liquid surface makes angle \( \theta_0 \) (\( \theta_0 < < 1 \)) with the x-axis at \(x = L\). If \(y(x)\) is the height of the surface then the equation for \(y(x)\) is: (take \(g\) as the acceleration due to gravity)
- NEET (UG) - 2025
- Surface Tension
- Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y. She notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.
- NEET (UG) - 2025
- Relative Velocity
- A physical quantity P is related to four observations a, b, c, and d as follows: P = a3 b2 (c / √d) The percentage errors of measurement in a, b, c, and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity P is:
- NEET (UG) - 2025
- Dimensional analysis and its applications
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
- Current electricity
Concepts Used:
Mechanism of Breathing
The air that we breathe in and breathe out of the lungs varies in its pressure. So basically when there is a fall down in air pressure the alveolar spaces drop down and the air enters the lungs (inspiration) as the pressure of the alveoli surpasses the atmospheric pressure, the air that is blown from the lungs (expiration). The rate of flow of air is in proportion to the magnitude of the pressure difference.
The breathing mechanism involves the following two processes:
- Inspiration - A contraction of muscles attached to the ribs on the outer side which pulls out the ribs and results in the expansion of the chest cavity is the process of inspiration.
- Expiration - The expiration process is considered once after the gaseous exchange takes place in the lungs and the air is expelled out. And the expulsion of air is called expiration.
Read More: Mechanism of Breathing