RESPIRATORY SYSTEMRespiratory system includes all the organs and tissues associated with the exchange of gases between an animal and its environment, leading to the release of energy in the ecosystem.
purpose of respirationThe purpose of respiration is to supply oxygen to the cells which oxidize or bum down the food to release energy.
most important organ of respirationThe most important organ of respiration in all land animals is the lung, while aquatic animals like fish use the gills to respire. Other organs associated with respiration are the nostril and diaphragm.
the lungsThe lung is located in the thoracic cavity of farm animals. The atmospheric oxygen .passes through the nostrils, the pharynx, larnyx or voice box bronchi and to the lungs
PROCESSES OF BREATHINGBreathing involves two processes:
(1) Inspiration (Inhalation): This involves the breathing in of air into the lungs. During the process, the following take place within and around the lungs.
(i) The diaphragm contracts and flattens out.
(ii) Intercostal muscles contract, ribs are thus raised.
(iii) Sternum moves forward.
(iv) Volume of thoracic cavity therefore increases and the pressure in the lungs is lowered.
(v) This therefore creates a high pressure in the lungs and oxygen is taken into the lungs.
(2) Expiration (Exhalation):This involves the breathing out of air from the lungs. During the process, the following take place within and around the lungs.
(i) The diaphragm relaxes and returns to its dome shape.
(ii) Intercostal muscles relax and the ribs are lowered.
(iii) The sternum moves backwards.
(iv) Volume of thoracic cavity therefore decreases; pressure in the lungs is increased and carbon dioxide is expelled from the lungs.
DIFFERENCES BETWEEN INHALED AIR AND EXHALED AIRGas Inhaled Air Exhaled Air
Oxygen 21% 16%
Carbon dioxide 0.03% 4%
Nitrogen 79% 79%
Water vapour Variable saturated
This oxygen is used to oxidize food substances in the mitochondria of the cells during tissue respiration to release energy used by farm animals for movement, growth, reproduction and other body metabolic activities.
HERE YOU WILL FIND EVERY AVAILABLE TOPICS ABOUT AGRICULTURAL SCIENCE AND BIOLOGY. AND THE LINKS TO THEIR VARIOUS SOURCES.
1. DEVELOPMENT OF AGRICULTURE
2. IMPORTANCE OF AGRICULTURE
3. SUBSISTENCE AGRICULTURE
4. COMMERCIAL AGRICULTURE
5. PROBLEM OF AGRICULTURAL DEVELOPMENT
6. SOLUTIONS TO POOR AGRICULTURAL DEVELOPMENT
7. AGRICULTURAL LAWS AND REFORMS
8. ROLES OF GOVERNMENT IN AGRICULTURAL DEVELOPMENT
80. SANDY SOIL
81. CLAY SOIL
82. LOAMY SOIL
83. SOIL TEXTURE
84. IDENTIFICATION OF SOIL TYPES THROUGH EXPERIMENTS
85. RETENTION OF WATER BY VARIOUS SOIL TYPES
86. DETERMINATION OF SOIL PH REACTION
87. COLORIMETRIC DETERMINATION OF SOIL PH LEVEL
88. PH SOIL TEST
89. PLANT NUTRIENTS
90. MACRO NUTRIENTS IN GENERAL
112. THE MAINTENANCE OF SOIL FERTILITY
113. CROP ROTATION
114. APPLICATION OF ORGANIC MANURES
115. FARM YARD MANURE
116. APPLICATION OF INORGANIC MANURE
118. FARMING PRACTICES
119. BUSH BURNING
121. FERTILIZER APPLICATION
122. ORGANIC MANURING
123. FARM YARD MANURE