Frank Modern Certificate Solution for Class 9 Biology Chapter 19 - Respiratory System
Frank Textbook Solutions Chapter 19 - Respiratory System
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Frank Textbook Solutions for class 9 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 9 Biology will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 9 students can refer to our solutions while doing their homework and while preparing for the exam.
Frank Modern Certificate Solution for Class 9 Biology Chapter 19 - Respiratory System Page/Excercise 176
Respiration: It is a process of release of energy from food substances such as glucose and fats under the control of enzymes, to carry out life processes, by the living organisms.
Respiration is essential for life as energy produced during this process is utilized by the organisms to carry out various biological activities.
Structure of nasal chamber:
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.
Turbinates: The respiratory region of nasal chamber is marked by three nasal turbinates.These are Ethmoturbinate, nasoturbinate and maxilloturbinates.
Function of turbinates: It increases the surface area, so that dust particles can be removed and air become humidified.
Adam's apple : It is a prominent elevation formed by the laminae of thyroid cartilage. It is more pronounced in male than female.
The function of lecithin film in the lungs is to decrease the surface tension and keeps the alveoli open.
Breathing: It is the physical process of taking in oxygen and giving out carbon dioxide.
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: It is a type of reflex whose stimulus is any foreign particle which results from deep inspiration followed by strong expiration that forcefully expel the air through the mouth.
(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.
Internal respiration: It is the transport of oxygen in the blood from the lungs to the cells and the transport of carbon dioxide from the tissue cells into the blood and to the lungs.
Respiratory quotient (RQ): It is the ratio of CO2 output to O2 uptake. It is denoted by R.
R = Rate of CO2 output / Rate of O2 uptake
RQ for carbohydrate = 1.00
RQ for fat = 0.70
RQ for protein = 0.85
(ix) Thoracic cavity
(iii) 500 cc
(v) 38 ATP
(i) Larynx = To produce voice
(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) Alveoli - Gaseous exchange
(ii) Larynx - Sound production
(iii) Thoracic cage - Breathing
Frank Modern Certificate Solution for Class 9 Biology Chapter 19 - Respiratory System Page/Excercise 177
(i) (b) Pleural membrane
(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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