Biology · General Awareness

Human Circulatory System

846 Questions

The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.

Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply

Human Circulatory System Questions

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

With reference to the blood in a normal person, which one of the following statements is correct?

  1. Compared to arteries, veins are less numerous and hold less of the body's blood at any given time.

  2. Blood cells constitute about 70 percent of the total volume of the blood.

  3. White blood cells (WBC) are made by lymph nodes only.

  4. The blood has more platelets than WBC.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells and platelets. The blood has more platelets than WBC. A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. An average normal range for white blood cells is between 4,500 and 10,000 /mcl.
Blood has many different functions. They are as follows:
  • Transporting oxygen and nutrients to the lungs and tissues.
  • Forming blood clots to prevent excess blood loss.
  • Carrying cells and antibodies that fight infection.
  • Bringing waste products to the kidneys and liver, which filter and clean the blood.
  • Regulating body temperature.
Multiple choice biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

________ caries blood from right ventricles to lungs.

  1. Superior vena cava

  2. Inferior vena cava

  3. Pulmonary arteries

  4. Pulmonary veins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The pulmonary artery is a blood vessel which delivers impure blood from right ventricles to lungs for the oxygenation. Pulmonary artery begins from the base of the right ventricle. As it leaves the heart it divides into two branches left and right pulmonary artery. The left and right branches bring their de-oxygenated blood to the corresponding left and right lungs.
So, the correct answer is 'Pulmonary arteries'.
Multiple choice biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

The pulmonary artery carries deoxygenated blood from the ........... to the lungs.

  1. Left ventricle

  2. Right ventricle

  3. Left auricle

  4. Right auricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pulmonary circulation carries blood to and from the lungs. They include the pulmonary artery (aorta) and its branches to the capillaries in the lungs, as well as the veins, that drain those capillaries. The pulmonary arteries carry blood low in oxygen from the right ventricle, while the pulmonary veins carry blood high in oxygen from the lungs into the left atrium. This circuit functions to eliminate carbon dioxide from the blood and replenish its supply of oxygen.

So, the correct answer is option B.

Multiple choice biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

Which of the following statement is correct regarding humans?

  1. Arteries always carry oxygenated blood while veins always carry deoxygenated blood

  2. Arteries. are provided with valves while veins are devoid of valves

  3. Arteries always carry blood away from the heart, while veins always carry blood towards the heart

  4. Venous blood is returned to the left ventricle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Arteries carry blood oxygenated blood away from the heart. While the veins carry deoxygenated blood towards the heart.

Pulmonary artery carries deoxygenated blood to the lungs for oxygenation. Pulmonary vein brings oxygenated blood to heart. 
So, the correct answer is option C.

Multiple choice biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

Body receives blood through arteries. Which one is out of place?

  1. Aorta

  2. Renal artery

  3. Coronary artery

  4. Pulmonary artery
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Aorta is the largest artery in body which supplies blood from heart to rest of the body parts.
B. Renal arteries are blood vessels that branch from abdominal aorta and supply blood to the kidneys.
C. Coronary arteries supply the oxygenated blood to heart.
D. Pulmonary artery carries deoxygenated blood from right ventricle to the lungs. 
Hence, body receives blood through arteries except the lungs which receive deoxygenated blood through pulmonary artery.
So, the correct answer is 'Pulmonary artery'.
Multiple choice biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

The pulmonary artery carries 

  1. Deoxygenated blood to the lungs

  2. Oxygenated blood to brain

  3. Oxygenated blood to the lungs

  4. Deoxygenated blood to the kidney
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Blood enters the heart through two large veins, the inferior and superior vena cava brought from different parts of the body.
  • This oxygen-deficient blood from the body is emptied into the right atrium of the heart which is further pumped to the right ventricle. 
  • As the right ventricle contracts, blood is pumped into the pulmonary artery and to the lungs where it is oxygenated.
  • Thus, the pulmonary arteries carry deoxygenated blood from the right ventricles to the lungs. So, the correct answer is 'Deoxygenated blood to the lungs'.