Chapter 19 : Respiratory System - Frank Solutions for Class 9 Biology ICSE
Chapter 19 - Respiratory System Exercise 176
Respiration is essential for life as energy produced during this process is utilized by the organisms to carry out various biological activities.
The nasal chamber is divided into left and right chambers by nasal septum. Each chamber is divided into three regions -
(i) Vestibule: It is the anterior most part of nasal chambers bearing hairs which filters the dust particles.
(ii) Respiratory region: It is rich in mucous glands and marked by nasal turbinates which traps the dust and humidify the air.
(iii) Olfactory chamber: It is lined by olfactory epithelium which sense the smell.
Function of turbinates: It increases the surface area, so that dust particles can be removed and air become humidified.
The function of diaphragm: It helps in breathing by contracting and relaxing thereby increase and decrease the volume of thoracic cavity. During inspiration diaphragm flattens while during expiration it becomes dome - shaped.
(i) Cough Reflex
(ii) Sneez Reflex
(ii) Sneeze Reflex: It is a type of reflex whose stimulus is in the nasal passage which causes spasmodic contraction of expiratory muscles that forecefully expel the air through the nasal passage.
(iii) Eupnea: Eupnea is a normal breathing.
(iv) Dyspnea: A condition in which breathing is painful.
(v) Apnea: A condition in which no breathing takes place.
R = Rate of CO2 output / Rate of O2 uptake
RQ for carbohydrate = 1.00
RQ for fat = 0.70
RQ for protein = 0.85
(i) Anterior most part of nasal chamber bearing hairs.
(ii) Sound producing organ.
(iii) Miniature lungs.
(iv) A film covering the alveoli of lungs and lowers the surface tension.
(v) High breathing rate.
(vi) Painful breathing.
(vii) No breathing.
(viii) Low breathing rate.
(ix) Body cavity in which lungs are situated.
(ix) Thoracic cavity
(i) The protective covering of the lung ______.(pericardium, pleura, renal fat)
(ii) Normal breathing is termed as ______. (eupnea, apnea, Dyspnea)
(iii) Tidal volume is ______. (eupnea, apnea, dyspnea)
(iv) R.Q. for fat is ______. (1200 cc, 500 cc, 5000 cc)
(v) Net gain of complete cellular respiration of carbohydrate ______. (2 ATP, 34 ATP, 38 ATP)
(iii) 500 cc
(v) 38 ATP
(ii) Alveoli = To increase the surface area for exchange of gases.
(iii) Conchae = It is also called turbinate and its function is to increase the surface area so that the dust particles can be removed and air become humidified.
(iv) Epiglottis = It closes the glottis during swallowing of food.
(v) Lecithin covering = It lowers the surface tension and keeps the alveoli open.
(vi) Cartilaginous rings = It prevents the collapsing of trachea.
(i) Lungs __ Respiration, Alveoli __ ______.
(ii) Nasal Chamber __ Accliamatization, Larynx __ ______.
(iii) Olfactory Chamber __ small, Thoracic Cage __ ______.
(ii) Larynx - Sound production
(iii) Thoracic cage - Breathing
Chapter 19 - Respiratory System Exercise 177
(i) Covering of lung is called
(b) pleural membrane
(ii) Sites of gaseous exchange in the lung is
(d) pulmonary chamber
(iii) Larynx acids as
(a) sound box
(b) value of controlling air
(c) organ producing sound
(d) all the above
(iv) During respiration, the diaphragm
(a) relaxed to become dome shaped
(b) Contracts and flattened
(d) shows no change
(v) Vital capacity of lungs in an average man is
(a) 500-1000 ml
(b) 1500-1800 ml
(c) 2000-2500 ml
(d) 3000-4500 ml
(vi) Partial pressure of O2 in inspired and expired air is
(a) 40 and 95 mm Hg
(b) 100 and 95 mm Hg
(c) 158 and 40 mm Hg
(d) 158 and 116 mm Hg
(ii) (b) Alveoli
(iii) (d) All the above
(iv) (d) shows no change
(v) (d) 3000 - 4500 ml
(vi) (d) 158 and 116 mm Hg
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