Tag: blood pressure

Questions Related to blood pressure

In which of the following points pulmonary artery is different from pulmonary vein?

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Its lumen is broad.

  2. Its wall is thick.

  3. It has valves.

  4. It does not possess endothelium

Show answer
Correct Option: B
Explanation:
The pulmonary artery carries deoxygenated blood from the heart to the lungs while the pulmonary vein carries oxygenated blood from the lungs to the heart. A pulmonary artery has a smaller lumen and thicker walls as compared to a pulmonary vein.
Thus, the correct answer is 'Its wall is thick.'

Given below are four statements (i-iv) regarding human blood circulatory system.
i. Arteries are thick-walled and have narrow lumen as compared to veins.
ii. Angina is acute chest pain when the blood circulation to the brain is reduced.
iii. Persons with blood group AB can donate blood to. any person with any blood group under ABO system.
iv. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. i and iv

  2. i and ii

  3. ii and iii

  4. iii and iv

Show answer
Correct Option: A
Explanation:

i. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

ii. Angina Pectoris is a pain in the chest due to deprived oxygen the heart muscle experience constricting pain. This is not a fatal condition and the pain passes off quickly.
iii. Persons with blood group AB is a universal recipients. It has both the antigens A and B but no bodies.
iv.  During clot, Thromboplastin helps in the formation of an enzyme prothrombinase. This enzyme inactivates heparin and it also converts the inactive plasma protein prothrombin into its active form, thrombin. Both changes require calcium ions.
So, the correct answer is 'i and iv'.

Which of the following statements is incorrect?

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Veins are typically larger in diameter than arteries.

  2. Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory system.

  3. Walls of arteries are elastic enabling them to stretch and shrink during changes in blood pressure.

  4. Veins contain more blood than any other part of circulatory system.

Show answer
Correct Option: B
Explanation:

A. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

B. Arteries branch out into smaller and thinner blood vessels called arterioles. these divide into still smaller vessels to provide blood to all the cells. The thinnest blood vessels are called capillaries. The flow of blood is very slow in capillaries.
C. The walls of arteries are a muscular and elastic coat. It consists of unstriated muscle fibres with some yellow elastic fibres are arranged in a circular manner. It holds the blood vessel open. This layer determines the amount of supply of blood to an organ and it maintains the blood pressure.
D. Veins bring back blood from the tissues and organs to the heart. The blood in veins flows under less pressure than that in arteries. Therefore, veins can accommodate more blood.
So, the correct answer is 'Because of their small size, blood flows rapidly in capillaries than in other parts of circulatory system'.

State the following statement true or false:


Arteries have openings

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Arteries do not have openings, while openings present in veins are called as valves. Blood after being pumped into arteries are under higher pressure than blood flowing in veins so to prevent backward flow of blood in veins valves are present.  Valves in veins also aid in the return of blood from the extremities to the heart.

So the correct answer is 'False'.

Splenic artery arises from?

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Anterior mesenteric artery

  2. Coeliac artery

  3. Posterior mesenteric artery

  4. Intestinal artery

Show answer
Correct Option: B
Explanation:
The splenic artery  is the blood vessel that supplies oxygenated blood to the spleen. It branches from the celiac artery, and follows a course superior to the pancreas. It supplies oxygenated blood to the arteries.
So, the correct option is 'Coeliac artery'.

Blood vessel carrying blood from lung to heart through-

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Pulmonary artery

  2. Pulmonary vein

  3. Coronory artery

  4. None of these

Show answer
Correct Option: B

In mammals, veins differ from arteries in having

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Thicker walls

  2. Deeply present

  3. Carry blood away from heart

  4. Internal valves

Show answer
Correct Option: D
Explanation:

Veins carry deoxygenated blood (with the exception of pulmonary veins and umbilical vein) from different parts of the body to the heart. They have thin, elastic muscle layer with semilunar valves that prevent the blood from flowing in the opposite direction. 

So, the correct answer is option D.

The vein that does not directly open into the heart is:

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Pulmonary vein

  2. postcaval vein

  3. Precaval vein

  4. Posterior mesentric vein

Show answer
Correct Option: D
Explanation:

  • The pulmonary vein opens directly into the left atrium while postcaval and precaval veins into the right atrium.
  • The posterior mesenteric vein is a blood vessel that drains blood from the small intestine (jejunum and ileum). At its termination behind the neck of the pancreas, it combines with the splenic vein to form the hepatic portal vein and hence does not open into the heart.
So, the correct option is 'Posterior mesenteric vein'.

Arteries carry oxygenated blood,except

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Coronary artery

  2. Hepatic artery

  3. Aorta

  4. Pulmonary artery

Show answer
Correct Option: D
Explanation:
  • Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

So, the correct answer is 'Pulmonary artery'.

Which of the following statement is true ?

evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

  1. Vessels are multicellular with narrow lumen

  2. Tracheids are multicellular with narrow lumen

  3. vessels are unicellular with narrow lumen

  4. Tracheids are unicellular with wide lumen

Show answer
Correct Option: A