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Practice AP EAMCET Human Anatomy and Physiology-I in the app →Which structure is called the sound box of the human body?What prevents food from entering the larynx during swallowing?At which vertebral level does the trachea divide into primary bronchi?The thin bag-like vascularised structures where gas exchange occurs are theThe lungs are covered by aWhat is the main role of pleural fluid around the lungs?The thoracic chamber is anatomically described asContraction of external intercostal muscles during inspirationA healthy human breathes about how many times per minute?The tidal volume in a healthy adult is approximatelyInspiratory reserve volume averagesInspiratory capacity is the sum ofFunctional residual capacity equalsVital capacity includes which volumes?About what percentage of O2 is carried by RBCs in blood?A haemoglobin molecule can carry at most how many O2 molecules?The oxygen dissociation curve has which shape?The pneumotaxic centre that moderates breathing lies in theWhich disorder involves wheezing from inflamed bronchi and bronchioles?Damage to alveolar walls, often from cigarette smoking, causesWhich animal breathes through a moist cuticle?Frogs can also respire through the skin; this is calledPlasma makes up nearly what share of blood?Which plasma protein is needed for blood clotting?Plasma proteins mainly involved in defence are theWhich plasma protein helps maintain osmotic balance?Erythrocytes, leucocytes and platelets together make up about what share of blood?A healthy adult man has how many RBCs per cubic millimetre of blood?Mammalian RBCs are biconcave and mostlyNormal haemoglobin content per 100 mL of blood isThe average life span of an RBC isWhich organ is called the graveyard of RBCs?Which of these is an agranulocyte?The most abundant WBCs in human blood areWhich WBCs secrete histamine, serotonin and heparin?Which WBCs are associated with allergic reactions?Platelets are cell fragments produced fromBlood group O can be given to people of any group, so O is aWhich blood group can accept blood from all ABO groups?Fibrin threads in a clot are formed from inactiveThrombin is formed from which inactive plasma substance?Which ions play an important role in blood clotting?Fats are absorbed through lymph in theAn open circulatory system is found inA fish heart has how many chambers?Which reptile group has a four-chambered heart?Amphibians and most reptiles have a heart withThe human heart is enclosed in a double walled bag called theThe valve between right atrium and right ventricle is theThe mitral valve guards the opening betweenWhere is the sino-atrial node located?With 72 beats per minute, one cardiac cycle lasts aboutEach ventricle pumps about how much blood per beat?Average cardiac output in a healthy person is aboutThe second heart sound, dub, is linked to closure ofIn a standard ECG, the P-wave representsThe middle layer of an artery wall of smooth muscle is thePulmonary veins carry oxygenated blood into theHow many pairs of main salivary glands does a human have?The largest salivary glands are theSalivary amylase begins the breakdown ofTooth enamel covers a bone-like material calledFood moves down the oesophagus by rhythmic muscle action calledThe average length of the human oesophagus is aboutGastric juice mainly containsThe semi-liquid food mass leaving the stomach is calledBile is made up of about what percentage of water?The major pigment of bile isThe endocrine pancreas releases insulin when blood sugar isBrunner's glands are found in theAbsorbed emulsified fats enter lymph capillaries calledWhich cells of the stomach secrete pepsinogen?Which hormone stimulates gastric juice production?Which stomach cells make intrinsic factor?Intrinsic factor is essential for absorbing which vitamin?Bile helps digestion mainly by doing what to fats?Which hormone triggers the gallbladder to release bile?Which three parts make up the small intestine, in order from the stomach?What are the lymph capillaries inside intestinal villi called?Which glands of the duodenum secrete bicarbonate-rich mucus?Which pacemaker structure starts each heartbeat?What is the role of the delay at the AV node?During atrial systole, what do the atria complete?Which valves close when ventricular systole begins?Right ventricular systole pumps blood through which vessel?