Breathing and exchange of gases practice · Mixed difficulty

Aerobic respiration involves I. external respiration II. transport of gases III. internal respiration IV. cellular respiration Choose the correct combination of options for the given statements

The percentage of carbon dioxide, oxygen and nitrogen in exhaled air of man are about :

$C{O_2}$ diffuses into …A… and forms $\mathrm{HCO}_3^ -$ and ${H^ + }$. At the …B… site where $PC{O_2}$ is low, the reaction proceeds in the opposite direction.
Thus, $C{O_2}$ is trapped as …C… at the tissue level and transported to alveoli is released out as …D…
Select the right choice for A, B, C and D to complete the given NCERT statement

Select the correct match.

An increase in lung ventilation rate is caused by which of the following conditions?

The process of exchange of ${O_2}$ from the atmosphere with $C{O_2}$ produced by the cells is called

Consider the following statements regarding regulation of respiration.
a. Role of oxygen is insignificant in regulation of respiratory rhythm.
b. An increase in concentration of CO2 and H+ ions, in arterial blood, activate chemosensitive area, which in turn signals pneumotaxic centre to make necessary adjustments.
c. Respiratory rhythm centre in medulla is primarily responsible for regulation of respiration.
d. Neural signals from pneumotaxic centre can increase the duration of inspiration.
Choose the option that mentions all correct statements.

Which part of the brain is called respiratory rhythm centre?

Arrange the given steps of respiration mechanism in the order, they occur in the human body
I. Breathing or pulmonary ventilation
II. Diffusion across the alveolar membrane
III. Transport of gases by blood
IV. Utilisation of ${O_2}$ by cells
V. Diffusion of ${O_2}$ and $C{O_2}$ between blood and tissues
Choose the correct option

A person who has inhaled normally has been asked to shout loudly what is the volume of air expected to be present in the lungs after this?

Assertion: Humans can directly alter the pulmonary volume
without change in the volume of
thoracic cavity
Reason: Our lungs are inelastic

The contraction of internal inter costals muscles in human causes

An …A… in the pulmonary volume …B… the intra pulmonary pressure to less than the atmospheric pressure which forces the air from …C… to move into the lungs, i.e., …D…
Choose the correct options for the blanks A, B, C and D to complete the above statement with reference to NCERT textbook

Assertion: The volume of air a person can expire after normal inspiration is TV + ERV
Reason: Volume of air that will remain in the lungs after a normal expiration is ERV + RV
These question consist of two statements each, printed as Assertion and Reason. While answering these Questions you are required to choose any one of the following four responses

Which two of the following changes (I-IV) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
I. Increase in red blood cell size.
II. Increase in red blood cell production.
III. Increased breathing rate.
IV. Increase in thrombocyte count.
Changes occurring are

Lungs have a large number of alveoli for

The nerve related with diaphragm is

Intra aortic balloon pump is inflated by

The oesophagus and trachea open into (A) . A cartilaginous flap called (B) prevents the entry of food into the glottis. (A) & (B) are.

Choose the odd one w.r.t. type of cartilage.

By which mechanism, oxygen is transported from lungs to cells?

How many of the following factors given in the box favor the formation of oxyhemoglobin? High $p{O_2},\mathrm{ }Low\mathrm{ }pC{O_2}$, High temperature, High H+ concentration. Choose the correct option.

Every 100 mL of deoxygenated blood delivers approximately?

Which is the wrong matched

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

Which of the following does not take place during expiration?

Identify the correct group of statements
I. Oxygen is carried by haemoglobin
II. Oxygen is carried by carbonic anhydrase
III. $C{O_2}$ is carried by haemoglobin
IV. $S{O_2}$ is carried by haemoglobin
V. Only oxygen is transported by the blood
VI. Only $C{O_2}$ is transported by the blood
Choose the correct option

I. Intra pulmonary pressure remains less than the atmospheric pressure
II. There is negative pressure in the lungs than the atmospheric pressure
In which of the above two situations inspiration takes place?
Choose the correct option accordingly?

Assertion: ${pO}_2$ in exhaled air is greater than ${pO}_2$ in alveolar air.

Reason: $pO_2$ in blood of pulmonary artery is equal to ${pCO}_2$ in blood of pulmonary veins.

Larynx is a ____ box which helps in sound production and hence called the sound box. Choose the option to fill the blank correctly.