The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

(1) C - Vena Cava - takes blood from body parts to right atrium, P_CO2 = 45 mm Hg

(2) D - Dorsal aorta - takes blood from heart to body parts, P_O2 = 95 mm Hg

(3) A - Pulmonary vein - takes impure blood from body parts to heart, P_O2 = 60 mm Hg

(4) B - Pulmonary artery - takes blood from heart to lungs, P_O2 = 90 mm Hg.

The volume of 'anatomical dead space’ air is normally

(1) 230 mL

(2) 210 mL

(3) 190 mL

(4) 150 mL.

Oxyhaemoglobin dissociates into oxygen and deoxyhaemoglobin at

1. low O₂, pressure in tissue

2. high O₂, pressure in tissue

3. equal O₂, pressure inside and outside tissue

4. all times irrespective of O₂, pressure

A person sitting at rest experiences a temporary cessation of breathing after forced deep breathing for a few minutes.This is due to:-

(1) too much CO₂ in the blood

(2) too much O₂ in the blood

(3) very little CO₂ in the blood

(4) both high O₂ and very little CO₂ in the blood

Epidermis is specialized for :-
(1) respiration

(2) absorption

(3) protection

(4) All of these
 

Assertion   :       Aerobic animals are not truely aerobic.

Reason      :       They produce lactic acid anaerobically.

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.