Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The diffusion membrane across which O2 and CO2 exchange occurs is made up of which three major layers?
The NCERT states, 'The diffusion membrane is made up of three major layers namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance...'
Under normal physiological conditions, every 100 ml of oxygenated blood delivers approximately how much O2 to the tissues?
The NCERT states, 'Every 100 ml of oxygenated blood can deliver around 5 ml of O2 to the tissues under normal physiological conditions.'
Regarding the transport of carbon dioxide in the blood, what percentage is primarily carried as bicarbonate?
The NCERT states, 'Nearly 20-25 per cent of CO2 is transported by RBCs whereas 70 per cent of it is carried as bicarbonate. About 7 per cent of CO2 is carried in a dissolved state through plasma.'
Which of the following conditions at the alveoli are favorable for the formation of oxyhaemoglobin?
The NCERT mentions, 'In the alveoli, where there is high pO2, low pCO2, lesser H+ concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin...'
The binding of oxygen with haemoglobin is primarily related to:
The NCERT states, 'Binding of oxygen with haemoglobin is primarily related to partial pressure of O2. Partial pressure of CO2, hydrogen ion concentration and temperature are the other factors which can interfere with this binding.'
Besides kidneys, which of the following organs also assist in the elimination of excretory wastes?
As per NCERT text, 'Other than the kidneys, lungs, liver and skin also help in the elimination of excretory wastes.'
What is the primary excretory substance eliminated by the lungs in significant quantities daily?
The NCERT states, 'Our lungs remove large amounts of CO$_2$ (approximately 200mL/minute) and also significant quantities of water every day.'
Which of the following substances are secreted by the liver and ultimately pass out with digestive wastes?
According to the NCERT, 'Liver, the largest gland in our body, secretes bile-containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs. Most of these substances ultimately pass out alongwith digestive wastes.'
What is the primary function of sweat produced by the sweat glands?
The NCERT explicitly states, 'Though the primary function of sweat is to facilitate a cooling effect on the body surface, it also helps in the removal of some of the wastes mentioned above.'
Which of these components is present in sweat?
The NCERT mentions, 'Sweat produced by the sweat glands is a watery fluid containing NaCl, small amounts of urea, lactic acid, etc.'
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