\(P_{CO_2}\) released from the body is about-
  • 15%
  • 30%
  • 70%
  • 23%
The trachea is lined with incomplete rings of-
  • Hyaline cartilage
  • Calcified cartilage
  • Fibrous cartilage
  • Elastic cartilage
The maximum affinity of hemoglobin is with-
  • Ammonia
  • Oxygen
  • Carbon monoxide
  • Carbon dioxide
Mammalian lungs are-
  • Spongy
  • Hollow
  • Solid and spongy
  • None
Sound is produced in mammals
  • By syrinx
  • By bronchus
  • During inhalation
  • During exhalation
The diffusion of  \(CO_2\) across the alveolar membrane is 20 times faster than that of because:-
  • \(CO_2\) is more soluble in \(H_2O\) than \(O_2\) which enables it to pass the membrane more readily
  • The \(CO_2\) pressure gradient is higher
  • \(CO_2\) is actively transferred
  • The alveolar area available for \(CO_2\) diffusion is larger
Hemoglobin is-
  • Blood carrier
  • Vitamin
  • Skin pigment
  • Respiratory pigment
In a fever breathing rate-
  • None
  • Increase
  • Decrease
  • Stop
Which of the following are respiratory organs of a scorpion?
  • Gills
  • Book-lungs
  • Ceridian
  • Lungs
Oxygen is carried by:-
  • Platelets
  • None of these
  • Leucocytes
  • Erythrocytes
Lungs are covered by
  • Periosteum
  • Pericardium
  • Perichondrium
  • Pleura
The form of energy used in respiration is –
  • Radiant energy
  • Mechanical energy
  • Chemical energy
  • Electrical energy
The narrowest and most numerous tubes of lungs are termed as-
  • Bronchus
  • Alveoli
  • Bronchioles
  • None of these
Expiration involves
  • Relaxation of diaphragm and intercostals muscles
  • Contraction of diaphragm and intercostals muscles
  • Contraction of intercostals muscles
  • Contraction of diaphragm muscles
During inspiration muscles of diaphragm-
  • Coiled like string
  • Contracts
  • No effect
  • Expands
Respiratory structures in the insects are –
  • Skin
  • Trachea
  • Gills
  • Lungs
A normal man respires in a minute-
  • 5 - 30 times
  • 20 -25 times
  • 14 -18 times
  • 10 -15 times
Epiglottis guards the opening of:-
  • Eustachian tubes
  • Oesophagus
  • Larynx
  • Internal nares
Exchange of gases in lung alveoli occurs thorough-
  • Simple diffusion
  • Active transport
  • Passive transport
  • Osmosis
In anaerobic respiration-
  • \(O_2\) is given out
  • \(O_2\) is taken in
  • \(CO_2\) is taken in
  • \(CO_2\) is given out
Vocal cards occur in-
  • Larynx
  • Glottis
  • Bronchial tube
  • Pharynx
The structure which prevents the entry of food into the respiratory tract is –
  • Glottis
  • Larynx
  • Epiglottis
  • Pharynx
The exchange of gases [\(O_2\) and \(CO_2\) ] in a mammal takes place in-
  • Trachea
  • Bronchioles
  • Bronchi
  • Alveoli
Breathing is controlled by a centre in the
  • Cerebellum
  • Heart
  • Medulla oblongata
  • Lungs
Which of the following is the source of respiration –
  • Stored food
  • Proteins
  • Fats
  • Glucose
Oxygen passes into the blood from the alveoli by a process called:-
  • Osmosis
  • Pinocytosis
  • Diffusion
  • Active transport
The smallest blood vessel in the body is
  • Capillary
  • Artery
  • vein
  • vena cava
Arteries carry oxygenated blood except
  • Pulmonary
  • Cardiac
  • Hepatic
  • systemic
Four chambered heart is found in:
  • Cobra
  • Tortoise
  • Salamander
  • Crocodile
The right atrium of the mammalian heart receives blood from
  • Sinus venosus
  • pulmonary veins
  • Precavals
  • Pre-and postcavals
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