In the blood of an adult man the total content of haemoglobin is roughly
(1) several hundred grams
(2) tens of gram (10-100 g)
(3) several grams
(4) several hundred milligram
The haemoglobin content per 100 ml of blood of a normal healthy human adult is:
(1) 5 - 11 g
(2) 25 - 30 g
(3) 17 - 20 g
(4) 12 - 16 g
Assertion : Coughing and sneezing are necessary.
Reason : Coughing and sneezing are reflex actions.
Assertion : Most fish when out of water, die of suffocation.
Reason : Atmospheric air contains far less oxygen content than the dissolved oxygen in water.
Assertion : During inspiration, pressure of air falls in the thorax.
Reason : There is a rise in volume of thorax during inspiration.
Assertion : During inspiration, the volume of thorax increases.
Reason : This happens due to the relaxation of diaphragm and inspiratory muscles.
Assertion : Forceful expiration occurs through expiratory muscles.
Reason : Expiratory muscles expires quickly.
Assertion : Vital capacity is higher in athletes than non-athletes.
Reason : Vital capacity is about 3.5-4.5 litres in a normal adult person.
Assertion : Gill-lamellae in aquatic animals help in exchange of gases
Reason : Each gill lamella carries many blood capillaries.
Assertion : In mammals, complex respiratory system has developed.
Reason : Mammalian skin is impermeable to gases.