Biology Objective Questions and Answers: Body Fluids and Circulation
Review structured MCQ sets for NEET Biology Body Fluids and Circulation. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.
Download Body Fluids and Circulation MCQs with Answers
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Multiple Choice Questions
(a) pulmonary
(b) cardiac
(c) hepatic
(d) systemic
Show Answer & Explanation
Answer: (a) pulmonary
Explanation:
1. The pulmonary artery carries deoxygenated blood from the heart to the lungs.
2. All other arteries carry oxygenated blood.
Teacher's Note:
1. Arteries carry blood away from the heart.
2. Pulmonary vein carries oxygenated blood.
(a) tunica media and tunica externa form a single coat
(b) tunica interna and tunica media form a single coat
(c) tunica interna, tunica media and tunica externa are thin
(d) tunica media is a thin coat
Show Answer & Explanation
Answer: (d) tunica media is a thin coat
Explanation:
1. A vein has a thin tunica media (muscle layer) and a thin wall, so its lumen is wide.
2. Arteries have a thick media and a narrow lumen.
Teacher's Note:
1. Veins have valves.
2. They carry blood at low pressure.
(a) AVnode
(b) bundle of His
(c) SA node
(d) Purkinje fibres
Show Answer & Explanation
Answer: (c) SA node
Explanation:
1. The sino-atrial (SA) node generates the impulse at the highest rate, so it is the pacemaker.
2. It lies in the wall of the right atrium.
Teacher's Note:
1. SA node sets the heart rate (about 72/min).
2. AV node delays the impulse.
(a) leukemia
(b) thrombosis
(c) haemolysis
(d) haemophilia
Show Answer & Explanation
Answer: (a) leukemia
Explanation:
1. Leukemia is cancer of the white blood cells, a blood cancer.
2. Thrombosis is clot formation, haemolysis is bursting of RBCs and haemophilia is a bleeding disorder.
Teacher's Note:
1. Leukemia means too many abnormal WBCs.
2. Haemophilia is X-linked.
(a) RBCs transport oxygen whereas WBCs transport CO 2
(b) RBCs transport oxygen whereas plasma transports only CO 2
(c) RBCs as well as WBCs transport both oxygen and CO 2
(d) RBCs as well as plasma transport both oxygen and CO2
Show Answer & Explanation
Answer: (d) RBCs as well as plasma transport both oxygen and CO2
Explanation:
1. RBCs carry oxygen (as oxyhaemoglobin) and also some CO2.
2. Plasma carries CO2 as bicarbonate and dissolved CO2, and also dissolved oxygen.
Teacher's Note:
1. Both RBCs and plasma carry both gases.
2. Haemoglobin is in RBCs.
(a) germs
(b) carbohydrates
(c) proteins
(d) lipids
Show Answer & Explanation
Answer: (c) proteins
Explanation:
1. Antibodies (immunoglobulins) are proteins made by plasma cells (B-cell derived) against antigens.
Teacher's Note:
1. Antibodies are Y-shaped proteins.
2. They are made in response to antigens.
(a) They scavenge damaged cells and cellular debris
(b) These are produced in thyroid
(c) There are of three main types—cytotoxic T-cells, helper T-cells and suppressor Tcells
(d) These originate in lymphoid tissues
Show Answer & Explanation
Answer: (c) There are of three main types—cytotoxic T-cells, helper T-cells and suppressor Tcells
Explanation:
1. T-lymphocytes are of three main types: cytotoxic, helper and suppressor T-cells.
2. They originate in bone marrow and mature in the thymus.
Teacher's Note:
1. T cells give cell mediated immunity.
2. Thymus is the site of maturation.
(a) pushing open of the venous valves
(b) suction pull
(c) stimulation of the sino auricular node
(d) pressure difference between the post caval and atrium
Show Answer & Explanation
Answer: (d) pressure difference between the post caval and atrium
Explanation:
1. Blood enters the right atrium from the vena cava due to the pressure difference between the vena cava and the relaxed atrium.
Teacher's Note:
1. Blood flows from high to low pressure.
2. Atrial diastole lowers its pressure.
(a) 130/90 mmHg is considered high and requires treatment
(b) 100/55 mmHg is considered an ideal blood pressure
(c) 105/50 mmHg makes one very active
(d) 190/110 mmHg may harm vital organs like brain and kidney
Show Answer & Explanation
Answer: (d) 190/110 mmHg may harm vital organs like brain and kidney
Explanation:
1. A blood pressure of 190/110 mmHg is very high and can damage organs such as the brain and kidney.
2. Normal BP is about 120/80 mmHg.
Teacher's Note:
1. Hypertension is above 140/90.
2. It damages blood vessels.
(a) AV node receives signal from SA node
(b) AV valves open up
(c) Ventricular walls vibrate due to gushing of blood from atria
(d) Semilunar valves close down after the blood flows into vessels from ventricles. EXCRETORY PRODUC
Show Answer & Explanation
Answer: (d) Semilunar valves close down after the blood flows into vessels from ventricles. EXCRETORY PRODUC
Explanation:
1. The second heart sound (dub) occurs when the semilunar valves close at the end of ventricular systole.
2. The first sound (lub) is due to closure of the AV valves.
Teacher's Note:
1. Lub is AV valves closing.
2. Dub is semilunar valves closing.
Body Fluids and Circulation Objective Questions & Solutions for NEET Biology
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FAQs
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