Zoology Set-2 (Breathing)

No. of questions -20

Time - 10 min

Amphibians e.g. frogs respire-

Through moist skin

Lungs

Both a and b

Trachea

Which the correct sequence of air passages in man?

External Nostril—> Nasal passage—> Internal nostril—> Pharynx —>Larynx—> Trachea —> Bronchi — > Bronchioles —> Alveoli

Nose—> Larynx—> Pharynx—> Bronchioles—> Bronchi —> Alveoli

Nose—> Pharynx —>Trachea—> Larynx—> Bronchi —> Bronchioles—> Alveoli

Nose —> Larynx—> Bronchi—> Pharynx—> Trachea—> Bronchioles —>Alveoli

Which is correct about nasopharynx?

Internal nostrils open into nasopharynx

It is the common passage for both air and food

It opens through gullet of the larynx region into the trachea

All

Which of the following options is wrong about the larynx(sound box)?

It is a bony box

Glottis is the opening into the larynx

During swallowing of food glottis is covered by epiglottis to prevent food entry into the larynx

All

Trachea divides into right and left primary bronchi at _______thoracic vertebra.

Incomplete cartilaginous rings support all of the following except-

Trachea

Primary, secondary and tertiary bronchi

Respiratory bronchioles

Initial bronchioles

Which of the following has the smallest diameter?

Trachea

Terminal bronchiole

Tertiary bronchus

Secondary bronchus

Lungs are comprised by –

Only alveoli

Pleura

Different types of bronchi

Network of bronchi, bronchioles and alveoli

Sites of gaseous exchange in lungs are –

Alveoli

Tracheoles

Bronchioles

Pleura

The part starting with the external nostrils upto the terminal bronchioles constitute the -

Respiratory or exchange part of respiratory system

Inspiratory part

Conducting part

Expiratory part

Respiratory or exchange part of the respiratory system consists of-

The parts starting with external nostrils upto terminal bronchioles

Alveoli and their ducts

All bronchi and terminal bronchioles

All bronchioles

The conducting part of the respiratory system has functions.

Filter, warm and moisten the air

Gaseous exchange

Filtering the air only

Warm the air

The chamber formed dorsally by the vertebral column, ventrally by sternum, laterally by ribs and on the lower side by dome-shaped diaphragm is-

Abdominal cavity

Thoracic cavity

Pelvic cavity

Cranial cavity

The lungs expand in inspiration/inhalation because -

Diaphragm contracts upward

The volume of thoracic cavity increases

External intercostal muscles relax

Diaphragm relaxes

The process of exhalation I expiration is begun mainly due to -

The contraction of intercostal muscles

The contraction of the diaphragm

The relaxation of muscles

Low pressure in thoracic cavity

Which of the following statements about the mechanism of ventilation/breathing is false?

As the diaphragm relaxes, air is expelled, from the respiratory system

During inspiration the lungs act as suction pump

Inspiration is a passive and expiration is an active process

For quiet breathing external intercostal muscles and diaphragm play an important role

Expiration takes place when the intrapulmonary pressure is —

Greater than the atmospheric pressure

Lesser than the atmospheric pressure

Equal to atmospheric pressure

Equal to intrapleural pressure

Additional muscles for forceful breathing are-

Diaphragm and external intercostals muscles

Abdominal muscles and internal intercostals. Muscles

Diaphragm and abdominal muscles

External and internal intercostals muscles

Expiratory capacity is equal to-

TV + ERV

ERV + IRV

ERV + RV

A spirometer cannot be used to measure-

ERV

IRV