MCQ ON HUMAN RESPIRATORY SYSTEM class 11 for NEET

MCQ ON HUMAN RESPIRATORY SYSTEM class 11 for NEET | HUMAN RESPIRATORY SYSTEM class 11| MCQ HUMAN RESPIRATORY SYSTEM with Answer | Check the below NCERT MCQ question for class 11Biology based on the with Answers.

MCQ on HUMAN RESPIRATORY SYSTEM class 11Biology with answers were prepared based on the latest pattern.We have provided class 11 Biology MCQs question with Answers to help students understand the concept very well.

MCQ ON HUMAN RESPIRATORY SYSTEM class 11 for NEET

MCQ ON HUMAN RESPIRATORY SYSTEM is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM/ KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024 ,2025

INTRODUCTION:-

HUMAN RESPIRATORY SYSTEM:-
WE HAVE A PAIR OF EXTERNAL NOSTRILS
Opening out above the upper lips.It leads to a nasal chamber through the nasal passage.
The nasal chamber opens in to nasopharynx, which is a portion of pharynx , the common passage for food and air.

RESPIRATORY VOLUMES AND CAPACITIES
TIDAL VOLUME:-
Volume of air inspired or expired during a normal respiration. A healthy man can inspire or expire approximately 6000- 8000 ml of air per minute.

Respiratory reserve volume;-additional volume of air a person can inspire by a forcible inspiration.This average 2500-3000 mL

Expiratory reserve volume :-
Additional volume of air a person can expire by forcible expiration.
This average 1000 mL to 1100 mL.

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

This is done by the neural system. Specialised centre present in the medulla region of the brain called respiratory rhythm center is primarily responsible for this regulation.

Another center present in the pons region of the brain called pneumotaxic centre can moderate the functions of respiratory rhythm centre. Neural signal from the centre can reduce the duration of inspiration and thereby altered respiratory rate.

Disorders of respiratory systems:-
Asthma:-it is difficulty in breathing of causing wheezing due to inflammation of bronchi and bronchioles.

Emphysema:- It is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased.

TRANSPORT OF GASES:-
Blood is the medium of transport for Oxygen and Carbon dioxide. About 97% of oxygen is transported by RBC in the blood. The remaining 3% of oxygen is carried in a dissolve state through the plasma. Nearly 20 to 25% of carbon dioxide is transported by RBCs where is 20% of it is carried as bicarbonate. About 7% of carbon dioxide is carried in a dissolve state through plasma.

TRANSPORT OF OXYGEN :-
Hemoglobin is red color iron containing pigment present in the RBCs. Oxygen can bind with hemoglobin in reversible manners to form oxyhemoglobin. Each hemoglobin molecule can carry a maximum of for molecules of oxygen. Binding of oxygen with hemoglobin is primarily related to partial pressure of oxygen molecule.

Partial pressure of carbon dioxide, hydrogen ions concentration, and temperature are the orther factors which can interfere with this binding.

Sigmoid curve is obtained when percentage saturation of hemoglobin with oxygen is plotted against the pO2.This curve is called the oxygen dissociation curve .
And is highly useful in studying the effect of factors like pressure of carbon dioxide hydrogen ions concentration on binding of oxygen molecule with hemoglobin.

TRANSPORT OF CARBON DIOXIDE:-
Carbon dioxide is carried by hemoglobin as Carbamino-haemoglobin . This binding is related to the partial pressure of carbon dioxide.
po2 is a major factor which could affect this binding. When pco2 is high and po2 is low as in tissues, more binding of Carbon dioxide occurs whereas , when the pco2 is low and po2 is high as in the alveoli, dissociation of CO2 from carbamino-haemoglobin takes place.

MCQ HUMAN RESPIRATORY SYSTEM class 11 for NEET/KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024,2025

1. The national chamber opens into ……… which is a portion of pharynx

(a) trachea
(b) nasopharynx
(c) alveoli
(d) bronchi

Ans (b) nasopharynx

2. Nasopharynx opens through glottis of the larynx region into ……….

(a) trachea
(b) sound box
(c) gill
(d) lungs

Ans. (a) trachea

3.Sound box is

(a) larynx
(b) lungs
(c) skin
(d) all the above

Ans. (a) larynx

4. During swallowing glottis can be covered by a thin elastic cartilaginous flap called

(a) lungs
(b) gills
(c) liver
(d) epiglottis

Ans.(d) epiglottis

5.Trachea is a straight tube extending up to the mid- thoracic cavity which divides at the level of 5th thoracic vertebrae into a right and left primary …….

(a) bronchi
(b) lungs
(c) skin
(d) none of the above

Ans.(a) bronchi

6. Each bronchi undergoes repeated divisions to form the secondary and tertiary
bronchi and bronchioles ending up in very thin terminal………

(a) bronchioles
(b) Inspiratory Capacity
(c) Expiratory capacity
(d) tidal volume

Ans.(a) bronchioles

7. Each terminal bronchioles gives rises to a number of very thin , irregular walled and vascularised bag like structure called

(a) functional residual capacity
(b) vital capacity
(c) total lung capacity
(d) alveoli

Ans.(d) alveoli

8.The branching network of bronchi, bronchioles and alveoli comprises the

(a) Vital capacity
(b) total capacity
(c) lungs
(d) kidney

Ans.(c) lungs

9. We have two lungs which are covered by a doubled layered ……..