Hiccups can be best described as

(1) forceful sudden expiration

(2) forceful contraction of intercostal muscles during deep breathing

(3) vibration of the soft palate during breathing while sleeping

(4) jerky incomplete inspiration.

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.