Respiration in humans - class-VIII
Rate and depth of
respiration shall increase when
State whether the following statements are true or false.
A normal man respires 70-80 times in a minute.
A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called
Heavy laboured and rapid breathing will result in which of the following?
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?