Free Blood Vessels MCQs with Answers
71 Blood Vessels MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
Last updated
71 questions · page 2 of 4
- A. Earthworm
- B. Cockroach
- C. Hydra
- D. Sponges
Explanation: In earthworms, haemoglobin is dissolved directly in the plasma rather than enclosed in red blood cells, and it transports oxygen through…
Correct answer: Earthworm- A. Red fluid
- B. Hemoglobin
- C. Fluid tissue
- D. Plasma
Explanation: Blood is classified as a fluid connective tissue because its plasma matrix transports cells and dissolved substances throughout the body.
Correct answer: Fluid tissue- A. 6.4
- B. 7.0
- C. 7.4
- D. 7.5
Explanation: Normal arterial blood is slightly alkaline, with a tightly regulated pH of about 7.35 to 7.45, commonly given as 7.4.
Correct answer: 7.424. It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.
- A. 35%
- B. 45%
- C. 55%
- D. 75%
Explanation: Blood is composed of about 55% plasma and about 45% formed elements such as red blood cells, white blood cells and platelets.
Correct answer: 55%- A. There are 5-7 pairs of heart.
- B. They are present between 1-7th segments.
- C. They are present lateral to the oesophagus.
- D. They pump blood from ventral to dorsal vessel.Standardized & Admissions Tests
Explanation: Earthworms have several pairs of muscular aortic arches, commonly called hearts, located around the oesophagus in the anterior segments.
Correct answer: They are present lateral to the oesophagus.- A. Red Blood Cells
- B. White Blood Cells
- C. Haemoglobin
- D. All of these
Explanation: Open circulatory systems contain hemolymph, which may include circulating cells called hemocytes that perform functions comparable to…
Correct answer: White Blood Cells- A. Antibodies
- B. Hemoglobin
- C. Enzymes
- D. Proteins
Explanation: Haemoglobin makes up most of the dry protein content of a red blood cell and occupies much of its cytoplasm, allowing the cell to…
Correct answer: Hemoglobin- A. Nautrophils
- B. Basophila
- C. Monocyte
- D. Lymphocyte
Explanation: Monocytes leave the bloodstream and differentiate into macrophages in tissues, where they engulf and digest large particles and pathogens…
Correct answer: Monocyte- A. Leucemia
- B. Thalassaemia
- C. Sickle cell anemia
- D. None of these
Explanation: Cooley's anaemia is beta-thalassaemia major, an inherited disorder in which defective beta-globin production causes severe anaemia.
Correct answer: Thalassaemia- A. Arteries
- B. Veins
- C. Capillaries
- D. None of these
Explanation: Arteries have the thickest and most muscular and elastic walls because they receive blood at high pressure directly from the ventricles.
Correct answer: Arteries- A. Stroke volume
- B. Cardiac output
- C. Blood pressure
- D. Blood flow
Explanation: Blood pressure is the force exerted by circulating blood against the walls of blood vessels, usually expressed in mmHg.
Correct answer: Blood pressure- A. Thrombus
- B. Embolus
- C. Atheroma
- D. Hematoma
Explanation: An atheroma is a fatty, cholesterol-rich plaque in an arterial wall, not a blood clot.
Correct answer: Atheroma- A. Myocardial infarction
- B. Cerebral infarction
- C. Cerebral Hemorrhage
- D. Thromboembolism
Explanation: Cerebral haemorrhage is bleeding caused by rupture of a blood vessel in or around the brain.
Correct answer: Cerebral Hemorrhage- A. Superior vena cava
- B. Inferior vena cava
- C. Hepatic vein
- D. Pulmonary vein
Explanation: The pulmonary vein carries oxygen-rich blood from the lungs to the left atrium, making it the exception among these veins.
Correct answer: Pulmonary vein- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Each capillary is extremely narrow, there are millions of them, and this wide distribution forces the blood to spread out, slowing it…
Correct answer: Option D- A. Oedema
- B. Leukaemia
- C. Thalassemia
- D. Atherosclerosis
Explanation: Thalassemia is a genetic disorder that affects the body's ability to produce normal haemoglobin, leading to reduced levels of haemoglobin…
Correct answer: Thalassemia- A. Blood flow in the brachial artery becomes turbulent, creating audible sounds
- B. The diameter of the lumen of the brachial artery gets minimized
- C. The pressure in the cuff is greater than the pressure in the artery
- D. Enough air pressure is pumped into the cuff to close the artery
Explanation: During blood pressure measurement, sounds are heard as blood starts to flow through the compressed artery and becomes turbulent.
Correct answer: Blood flow in the brachial artery becomes turbulent, creating audible sounds- A. Prevent collapse of these blood vessels
- B. Reduce friction within these blood vessels
- C. Anchor these vessels with surrounding tissues
- D. Prevent too much pressure exerted on their walls
Explanation: The thick elastic layer in the walls of large arteries, such as the aorta, is crucial for maintaining blood pressure and ensuring…
Correct answer: Prevent too much pressure exerted on their walls- A. Capillaries lack valves
- B. Capillaries have one cell thick walls
- C. Resistance in blood flow is negligible in capillaries
- D. Total cross-sectional area of the capillaries is greater than other vessels
Explanation: The correct answer is that the rate of blood flow is slowest in capillaries because the total cross-sectional area of the capillaries is…
Correct answer: Total cross-sectional area of the capillaries is greater than other vessels- A. Normal
- B. Hypotension
- C. Mild hypertension
- D. Hypertension requiring treatment
Explanation: The reading of 176/105 mm Hg indicates stage 2 hypertension, which is characterized by a systolic pressure of 160 mm Hg or higher and/or a…
Correct answer: Hypertension requiring treatment