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101.

Which of these occurs during the atrial systole?(a) Both atria contract simultaneously(b) Action potential is generated by the AVN initially(c) Tricuspid valve closes(d) The semilunar valves remain openThis question was posed to me in an interview for job.This is a very interesting question from Human Circulatory System in chapter Body Fluids and Circulation of Biology – Class 11

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Right answer is (a) Both atria contract simultaneously

Easiest explanation: During the atrial SYSTOLE, both the atria contract simultaneously while the ventricles remain relaxed. It OCCURS due to the action potential GENERATED by the SAN. The TRICUSPID and bicuspid VALVES open.
Discussion
102.

How many times does the heart beat in one minute?(a) 40-60(b) 80-120(c) 70-75(d) 12-15I had been asked this question in an interview.This is a very interesting question from Human Circulatory System in division Body Fluids and Circulation of Biology – Class 11

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Right option is (c) 70-75

The EXPLANATION: The heart BEATS 70-75 times in one minute. 72 times is the average NUMBER of heart beats for an adult per minute. It is INFLUENCED by the activity of the sinoatrial node or the PACEMAKER of the heart.
Discussion
103.

How many action potentials can the SAN generate per minute?(a) 40-60(b) 80-120(c) 12-16(d) 70-75The question was asked in final exam.I'm obligated to ask this question of Human Circulatory System topic in portion Body Fluids and Circulation of Biology – Class 11

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Correct CHOICE is (d) 70-75

Best explanation: The SAN or the sinoatrial node possesses the ABILITY to GENERATE action potentials without receiving any EXTERNAL stimuli. It is AUTO excitable and can generate 70-75 action potentials per minute.
Discussion
104.

What is the opening between the left atrium and the left ventricle known as?(a) Mitral valve(b) Tricuspid valve(c) Aortic valve(d) Pulmonary valveThis question was addressed to me during an interview.Question is taken from Human Circulatory System topic in division Body Fluids and Circulation of Biology – Class 11

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Correct option is (a) Mitral VALVE

To elaborate: A septum SEPARATES the atria and the VENTRICLES. There is an opening between the left atrium and the left ventricle to PERMIT the flow of BLOOD. This is called the mitral valve or the bicuspid valve.
Discussion
105.

Which of these are the most abundant in blood?(a) Eosinophils(b) Basophils(c) Monocytes(d) NeutrophilsThis question was addressed to me by my school principal while I was bunking the class.Asked question is from Body Fluids in section Body Fluids and Circulation of Biology – Class 11

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The CORRECT answer is (d) Neutrophils

The explanation is: Out of all the different types of LEUKOCYTES present in BLOOD, neutrophils are the most abundant in blood. They constitute 60-65% of the TOTAL number of white blood cells. They are phagocytic cells.
Discussion
106.

Which of the following is not secreted by basophils?(a) Histamine(b) Serotonin(c) Heparin(d) SerumThe question was asked in quiz.My question is taken from Body Fluids and Circulation Basics topic in chapter Body Fluids and Circulation of Biology – Class 11

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The CORRECT answer is (d) Serum

For explanation: Basophils secrete histamine, serotonin and HEPARIN which are involved in the INFLAMMATORY reactions. Histamine acts as a vasodilator while serotonin acts as a VASOCONSTRICTOR.
Discussion
107.

WBCs are characterised into 4 main categories.(a) True(b) FalseI have been asked this question in homework.I'd like to ask this question from Body Fluids and Circulation Basics in chapter Body Fluids and Circulation of Biology – Class 11

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The correct choice is (b) False

To ELABORATE: WBCs are characterised into 2 MAIN categories- granulocytes and agranulocytes. Neutrophils, eosinophils and basophils are different types of granulocytes while LYMPHOCYTES and monocytes are the agranulocytes.
Discussion
108.

Which of the following are needed for clotting of blood?(a) Fibrinogen(b) Albumin(c) Globulin(d) Magnesium ionsThis question was posed to me at a job interview.The above asked question is from Body Fluids and Circulation Basics topic in portion Body Fluids and Circulation of Biology – Class 11

Answer» RIGHT option is (a) Fibrinogen

The EXPLANATION: Fibrinogens are needed for clotting or COAGULATION of blood. Globulins primarily are involved in defence mechanisms of the body and the ALBUMINS HELP in the osmotic balance.
Discussion