MHT-CET Breathing and Exchange of Gases — practice questions
71 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice MHT-CET Breathing and Exchange of Gases in the app →Which structures do insects use to carry air within the body?Earthworms exchange respiratory gases mainly through which surface?Respiration through the moist skin of a frog is known as what?Which vertebrate group breathes with gills?Which organ of the human respiratory tract is called the sound box?What prevents food from entering the larynx during swallowing?At which vertebral level does the trachea divide into primary bronchi?What are the thin vascularised bag-like units at the ends of terminal bronchioles?How many layers does the membrane covering each lung have?Besides transporting air, the conducting part does what to the air?What is meant by pulmonary ventilation?Inspiration occurs when intra-pulmonary pressure is what?What is the average breathing rate of a healthy human at rest?What is the approximate tidal volume of a healthy adult?About how much air can a healthy man move in a minute of normal breathing?What is residual volume?Expiratory capacity is the sum of which two volumes?If ERV is 1100 mL and RV is 1200 mL, what is the FRC?Which site is the primary place for gas exchange in the lungs?The pressure contributed by one gas in a gas mixture is called what?CO2 solubility compared with O2 is about how many times higher?How many major layers make up the alveolar diffusion membrane?What percentage of oxygen is carried by RBCs?How much oxygen is carried dissolved in plasma?Each haemoglobin molecule can carry at most how many O2 molecules?What is the shape of the oxygen dissociation curve?Normally, how much O2 can 100 mL of oxygenated blood deliver to tissues?Which brain region holds the respiratory rhythm centre?Which centre in the pons can moderate the rhythm centre?The chemosensitive area near the rhythm centre responds mainly to what?Which disorder involves inflammation of bronchi and bronchioles causing wheezing?Which chronic disorder damages alveolar walls, with smoking a major cause?What percentage of the blood volume is plasma?What proportion of plasma is water?Which plasma protein is needed for blood clotting?Which plasma proteins are mainly involved in defence mechanisms?Which plasma proteins help maintain osmotic balance?Which are the most abundant cells in blood?What is the average RBC count of a healthy adult man per mm3 of blood?Most mammalian RBCs are biconcave and lack which structure?How much haemoglobin does 100 mL of healthy blood contain?What is the average life span of an RBC?Which set contains only granulocytes?Which leucocytes are the most abundant, at 60 to 65 percent of WBCs?Which WBCs are the least numerous, at 0.5 to 1 percent?Which WBCs secrete histamine, serotonin and heparin?Which two leucocytes are phagocytic cells?From which cells in bone marrow are platelets produced?Which blood group is the universal donor?Which blood group can receive blood from all four groups?From which inactive plasma substance is thrombin formed?Which ions play a very important role in blood clotting?How many chambers does a fish heart have?A frog heart has how many chambers?Which group has a four-chambered heart along with birds and mammals?Which type of circulation occurs in fishes?The human heart develops from which germ layer?The heart is enclosed in a double walled bag called what?Which valve guards the opening between right atrium and right ventricle?Which valves guard the openings into the aorta and pulmonary artery?About how much blood does each ventricle pump per beat?A person has a stroke volume of 70 mL and a rate of 75 beats a minute. Find cardiac output.The second heart sound (dub) is linked to closing of which valves?Which layer of an artery wall has smooth muscle and elastic fibres?Which vessel layer is lined by squamous endothelium?Which layer is comparatively thin in veins?What supplies blood to the cardiac muscle itself?Why is the human heart described as myogenic?What is the normal blood pressure reading in a healthy adult?Repeated readings of what level or higher indicate hypertension?Why is heart failure also called congestive heart failure?