Breathing and exchange of gases practice · Medium

Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit the demands of the body tissues. This is achieved by

Complete the analogy w.r.t. percentage of gases transported by RBCs.
${O_2}:\mathrm{ }97\% \mathrm{ }::\mathrm{ }CO$ ;

Book lungs are respiratory structures of

Blood does not transport oxygen due to absence of respiratory pigment in

Relaxation of the diaphragm and the intercostal muscles results in

Oxyhaemoglobin in the blood is formed when

The maximum quantity of air that can be expired after a maximal inspiratory effort is:-

Left shift of oxyhaemoglobin curve is noticed under

Assertion : Aerobic respiration involves the
exchange of respiratory gases twice.

Reason : Exchange occurs from lung to heart
and then heart to lung.

Statement-I: In women and children the vocal cords are usually short and hence voice is high pitched.
Statement-II: In men, the vocal cords are thicker and longer hence low pitched.

Respiratory organ of insects are

Read the given statements and select the correct option

Statement 1: Respiration is most efficient in the insect, among the invertebrates.

Statement 2: In the insects, air is carried directly to the cells by tracheoles

Every 100 ml deoxygenated blood delivers around - $\;C{O_2}$ to alveoli -

Read the given statement and fill in the blanks
Blood is the medium for transport of gases. About ---- A ---- % of $C{O_2}$ is transported in dissolved from through plasma while around ---- B ----- % is transported through RBC

The alveolar ventilation rate in a healthy person is about 4200 ml/min and tidal volume is 500 mL calculate the amount of dead air space, if breathing rate is12 per min.

Statement-I: When pH of blood increase then oxygen dissociation cure shifts towards right side.

Statement-II: Due to high pH affinity of ${O}_2$ with Hb decrease.

How many of the following conditions given in the box favour formation of oxyhaemoglobin?

Read the following statements and choose the option having incorrect statements only.
A) Trachea divides at the level of 5th thoracic vertebra into a right and left primary bronchi.
B) Initial bronchioles are supported by complete cartilaginous rings.
C) Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag-like structures called bronchi.
D) Larynx is a cartilaginous box which helps in sound production and hence called the sound box.

Pneumotaxic centre of the brain can

For air flow into or out of the lungs there must be

Cellular respiration is a/an _____ process

Partial pressures of oxygen and carbon dioxide in alveoli of healthy human being are, nearest to

Volume of air breathed in and out, while at rest is called

Functional residual capacity in human is the amount of air

Given below is a list of some structures of human respiratory system in a box. Primary bronchi, Trachea, Terminal bronchiole, Respiratory bronchiole
How many of them do not possess incomplete cartilaginous rings?

Assertion (A) $C{O_2}$ transport occurs very fast through RBCs.
Reason (R) Enzyme carbonic anhydrase is absent in the
blood plasma

Complete the following analogy

Bombyx : Tracheal system : : Limulus :_____

Receptors associated with the aortic arch and carotid artery can recognize the changes in …A… and ${\mathrm{H}^ + }$ concentration and send necessary signals to the …B… for remedial actions Select the right choice for A and B to complete the given NCERT statement

Assertion: Respiratory rhythm centre is
moderated by pneumotaxic centre, located in the
medulla region of the brain.

Reason: Pneumotaxic centre controls the switch
'ON' point of inspiration.

Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.