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(i) Mammals have negative pressure breat...

(i) Mammals have negative pressure breathing.
(ii) The impulses for voluntary breathing are sent by the medulla oblongata.
(iii) The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings.
(iv) The volume of air remaining in the lungs even after a forcible expiration is functional residual capacity.
How many of the above statements are correct?

A

Two

B

Three

C

One

D

Four

Text Solution

Verified by Experts

The correct Answer is:
B
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Which of the following statements about the human respiratory system are INCORRECT ? I. During swallowing , glottis can covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx. II. The trachea is a straight tube extending up to the mid- thoracic cavity, which divides at the level of the fourth thoracic vertebra into a right and left primary bronchi. III. The trachea , primary secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings made up of hyaline cartilage. IV. The respiratory part transports the atmospheric air to the alveoli, clear it from foreign particles, humidifies and also brings the air to body temperature.

which of the following statements are correct . ? (i) Fishes respire with the lungs . (ii) A water breather expends much nore energy in ventilating its respiratory surface than an air- breathing one. (iii) Lungs become empty after forceful expiration. (iv) A rise in Po_(2) increase the affinity of haemoglobin for oxygen. (v ) Lactic acid is produced in anaerobic respriation . (vi) Exchange of gases in the lungs is interrupted during expiration. (vii) A molecule of haemoglobin can carry 1-4 molecules of oxygen. (viii) maximum contraction of diaphragm causes maximum expiration. (ix) Respiratory movements are controlled by CO_(2) concentration of arterial . blood. (x ) Tidal volume is equal ot the vital capacity of the lungs.

Consider the following statements each with two blanks. (i) Actually, only about overset((1))"_____" mL of air enters the lungs alveoli for the exchange of gases. The remaining fills the respiratory passage and is termed overset((2))"_____" . (ii) The amount of air which one can inhale with maximum effort and also exhale with maximum effort is termed as overset((3))"_____" . It is about overset((4))"_____" in normal adult person. (iii) During normal quiet breathing, on an average, approximately overset((5))"_____" mL of air is inspired or expired by adult human male in each breath. It is termed as overset((6))"_____" volume. Which of the following options gives the correct fill ups for the respective blanks numbers from (1) to (6) in the above statement ?

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