Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Blood brings carbon dioxide from the rest of the body for release into the:
intestines
oesophagus
stomach
alveoli
alveoli
The primary function of the respiratory system is gas exchange. Deoxygenated blood, enriched with carbon dioxide (CO2тАЛ) as a byproduct of cellular metabolism, travels from tissues to the heart and is then pumped to the lungs, where it enters the pulmonary capillaries surrounding the alveoli to release CO2тАЛ and pick up oxygen (O2тАЛ).
The primary function of the respiratory system is gas exchange. Deoxygenated blood, enriched with carbon dioxide (CO2тАЛ) as a byproduct of cellular metabolism, travels from tissues to the heart and is then pumped to the lungs, where it enters the pulmonary capillaries surrounding the alveoli to release CO2тАЛ and pick up oxygen (O2тАЛ).
Think of the lungs as a busy shipping port: the blood acts as the transport trucks arriving with 'waste' (CO2тАЛ) to be loaded onto outgoing 'ships' (exhaled air) while simultaneously picking up 'fresh supplies' (oxygen) for delivery.
CO2тАЛ+H2тАЛOтЗМH2тАЛCO3тАЛтЗМH++HCO3тИТтАЛ тАФ Carbon dioxide transport mechanism (bicarbonate buffer system)
Gas exchange occurs via simple diffusion across the respiratory membrane. The partial pressure of carbon dioxide (PCO2тАЛ) is higher in the blood entering the pulmonary capillaries than in the alveolar air space (PCO2тАЛтЙИ45mmHg in blood vs 40mmHg in alveoli), causing CO2тАЛ to diffuse out of the blood and into the alveoli to be exhaled.
Alveoli are the functional units of the lungs where gas exchange occurs.
The blood-air barrier is extremely thin to facilitate rapid diffusion.
Deoxygenated blood carries CO2тАЛ mainly in the form of bicarbonate ions (HCO3тИТтАЛ).
High surface area of alveoli allows for efficient gas exchange.
Essential for cellular respiration and homeostasis.
Vital for maintaining blood pH levels.
The process is passive; it relies solely on concentration gradients.
Option A (intestines) is for nutrient absorption, B (oesophagus) is for food transport, C (stomach) is for food digestion.
D is correct тАФ Blood transports carbon dioxide to the alveoli in the lungs so it can be removed from the body via exhalation.
Always distinguish between the digestive system (processing nutrients) and the respiratory system (gas exchange) to avoid confusion in exam questions.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants