Human lungs - class-XI
Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?
Read the given statements and select the correct option.
Statement 1 : Mammals can eat while breathing.
Statement 2 : Mammals have negative-pressure breathing.
Given below is a list of different steps (i-vi) involved in respiration.
(i) Utilisation of $O _2$ by the cells for catabolic reactions
(ii) Transport of gases by the blood
(iii) Pulmonary ventilation by which atmospheric air is drawn in and $CO _2$ is released out
(iv) Release of resultant $CO _2$
(v) Diffusion of $O _2$ and $CO _2$ between blood and tissues
(vi) Diffusion of gases ($O _2$ and $CO _2$) across alveolar tissues.
Select an option which has correct sequence of all the steps.
Consider the following statements each with two blanks.
(i) Diaphragm contracts to help in __(1) while the contraction of abdominal muscles helps in (2).
(ii). Vital capacity of trained athletes is _(3)__ than that of non-athletes while the vital capacity of non-smokers is (4) than that of smokers.
(iii) Alveolar P$O {2}$ is _(5) than the venous P$O {2}$ while arterial P$O _{2}$ is __(6)_ than the alveolar P$O _{2}$.
Which of the following options gives the correct fill ups for the respective blanks numbers from (1) to (6) in the above statements?
Complete the following sentence by selecting the correct option.
The breathing rhythm is generated in the (i) and is influenced by variation in levels of (ii)_ in the blood.
The most important muscular structure in respiratory system of rabbit is
Thoracic cavity is enlarged by contraction of
Lungs ventilation movements is due to
Hiccough (hiccup) is due to activity of
Which of the following structures are responsible for breathing process?
The exhaled air mainly contains
Rita breathes out on a mirror and finds water droplets on it. This activity helps to conclude the fact that
In mammals, the body cavity is partitioned into thoracic and abdominal parts by.
Forced deep breathing during rest for some time is followed by temporary stoppage of breathing because of.
To generate pressure gradients for faciliatating expiration and inspiration, the human body uses the intercostal muscles and.
Increase in $CO _2$ concentration shall cause.
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
Read the following statements:
(A) Nasal chamber opens into nasopharynx which is a portion of pharynx
(B) Larynx produces sound during inspiration as well as expiration
(C) During swallowing gullet can be covered by a thin elastic cartilagenous flap called epiglottis
(D) Trachea is get divided at the level of the 6th thoracic vertebra into right and left primary bronchi.
(E) The braching network of bronchi, bronchioles and alveoli comprise the lungs.
How many statements are not correct-
During inspiration muscles of diaphragm
How much an average man breathe per day?
Which of the following is true for $CO _2$ concentration ?
Hiccough (hiccup) is due to activity of
The diaphragm contracts, resulting in inhalation as the volume of thoracic cavity
Which of the following changes occur in diaphragm and intercoastal muscles when expiration of air takes place?
The respiratory centre leading to faster breathing is on account of ________________.
Pneumoconiosis is a type of
Fatal degenerative lung disease caused by particulate asbestos is referred to as
Asbestosis increases the risk of developing all of the following except
Number of alveoli in human lung is about
If the lung were punctured, which of the following would happen?
Lungs are enclosed in?
Which one of the following statements is incorrect?
State if the following statement is True or False. Correct the False statement.
Our lungs eliminate metabolic wastes like urea from the body.
State if the following statement is True or False. Correct the False statement.
Bile pigments are the excretory products excreted by the lungs.
Serous membrane coverning of lung is?
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because.
Lungs are not affected by the disease.
In human beings the number of lobes in right and left lungs is?
The covering of the lung is called.
Capacity of human lungs for air in a healthy person is?
Which among the following serves the function of lung surfactant?
Majority of $CO _2$ produced by our body cells is transported to lungs
Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when
Choose the correct answer from the alternatives given.
The lung is enclosed in a double layered membrane called
The exchange of gases in human beings takes place in-