CBSE Class 11 (Science) Body Fluids and Circulation — practice questions
96 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Body Fluids and Circulation in the app →The oxygen-carrying pigment in red blood cells isA person with blood group O isThe insoluble protein meshwork in a blood clot is made ofThe natural pacemaker of the human heart is theStroke volume 70 mL, heart rate 80 bpm. Cardiac output isA typical normal blood pressure for a healthy adult isThe lifespan of a human red blood cell (erythrocyte) is approximately:A person with blood group AB is considered:The most ABUNDANT type of WBC in human blood is:The mammalian heart has how many chambers?In a typical ECG, the QRS complex represents:A normal resting blood pressure is approximately:Plasma makes up roughly what share of total blood volume?Water forms what proportion of human plasma?Which plasma protein is needed for blood clotting?Plasma globulins are chiefly concerned with which function?Which plasma protein mainly maintains osmotic balance?Plasma from which the clotting factors have been removed is called what?Which three components are collectively called the formed elements of blood?Formed elements make up about what share of blood?Which cells are the most abundant in human blood?A healthy adult man has about how many RBCs per cubic millimetre of blood?In adults, where are red blood cells formed?Most mammalian RBCs lack a nucleus and have which shape?Which metal is present in the haemoglobin of red blood cells?How much haemoglobin does 100 mL of healthy blood normally hold?What is the average life span of a red blood cell?Which organ is called the graveyard of RBCs?Why are leucocytes colourless?The WBC count of healthy blood averages how many per cubic millimetre?Which of these white blood cells is an agranulocyte?Which WBC type makes up 60 to 65 percent of all leucocytes?Which leucocytes are the least numerous, at only 0.5 to 1 percent?Which two WBC types are phagocytic?Which cells release histamine, serotonin and heparin in inflammation?Which white blood cells are associated with allergic reactions?Which two forms of lymphocytes mediate immune responses?From which bone marrow cells are platelets produced?What can a marked fall in platelet number cause?ABO blood grouping rests on which two RBC surface antigens?Which blood group is known as the universal donor?Which blood group can accept blood from all ABO groups?Roughly what percentage of humans are Rh positive?What happens if an Rh negative person receives Rh positive blood?Destruction of foetal RBCs by maternal anti-Rh antibodies is known as what?What is the main purpose of blood coagulation after an injury?A blood clot is mainly a network of which threads?Which enzyme converts inactive fibrinogen into fibrin?Which inactive plasma substance is the precursor of thrombin?Which enzyme complex is required to form thrombin from prothrombin?Which ions play a very important role in blood clotting?After an injury, which blood cells release factors that start coagulation?What is the fluid that leaks from capillaries into spaces between cells called?Compared with plasma, tissue fluid has what mineral distribution?The lymphatic system drains tissue fluid back into which vessels?Lymph is a colourless fluid rich in which specialised cells?Through which structures in the intestinal villi are fats absorbed into lymph?Which animals have an open circulatory system?How many chambers does a fish heart have?Amphibians and most reptiles have a heart with how many chambers?What type of circulation do fishes show?The mixing of blood in the single ventricle gives amphibians which circulation?Birds and mammals, with no mixing of blood in ventricles, show what?From which embryonic germ layer is the human heart derived?The human heart is about the size of what?The heart is enclosed in a double walled bag called what?Which valve guards the opening between the right atrium and right ventricle?The bicuspid valve is also known by which name?Which chambers' walls are much thicker than those of the atria?Where is the sino-atrial node located?The minute fibres spreading through the ventricular muscle are called what?Which node acts as the pacemaker of the heart?What is the average resting heart rate given for a healthy person?At the start of the cardiac cycle, all four chambers are in what state?Atrial systole adds about what share of blood to ventricular filling?Which structure transmits the impulse through the whole ventricular muscle?The second heart sound, dub, is linked to closure of which valves?At 72 beats a minute, how long does one cardiac cycle last?Each ventricle pumps out about how much blood per beat?Cardiac output is the product of heart rate and what?In a standard ECG, what does the P-wave represent?The QRS complex of an ECG represents what event?The T-wave of an ECG shows the return of which part to its normal state?Counting which ECG feature gives the heart beat rate?Which layer of an artery or vein is comparatively thin in veins?Which vessel carries blood from the left ventricle to the body?Which chamber receives oxygenated blood from the pulmonary veins?Which vascular connection carries blood from the intestine to the liver?Which special vessels supply blood exclusively to cardiac muscle?Why is the human heart described as myogenic?Which brain region moderates cardiac function through the ANS?Which hormones can also increase the cardiac output?Normal blood pressure is taken as which reading?Repeated readings of which value or higher indicate hypertension?Acute chest pain from too little oxygen reaching heart muscle is called what?Which term means that the heart stops beating?