Biology · General Awareness

Human Circulatory System

818 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

In human beings, the pulmonary artery originates from the

  1. septomarginal trabecula

  2. conus arteriosus

  3. crista terminalis

  4. fossa ovalis

  5. limbus of the fossa ovalis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is a conical extension of the right ventricle in the heart of mammals, from which the pulmonary artery originates.

Multiple choice

_______ carries away the filtered blood from the kidneys.

  1. Renal vein

  2. Pulmonary vein

  3. Aorta

  4. Renal artery
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Renal vein carries away the filtered blood from the kidneys. Nephron is the structural and functional unit in kidneys. Each nephron is made up of 2 main parts: malphigian body and renal tubule. Malphigian body comprises a cup-shaped Bowman's capsule and a network of blood capillaries, the glomerulus. The renal artery, after entering the kidney, divides and redivides forming various afferent renal arterioles. An afferent arteriole enters a Bowman's capsule to form glomerulus. The efferent renal arteriole has narrower lumen than the afferent renal arteriole. Thereafter, an efferent renal arteriole leaves the glomerulus. The efferent renal arteriole breaks up into capillaries around the tubules. All the capillaries, in turn, unite to form renal venules and the latter together form the renal vein, which leaves the kidney. Thus, after the process of filtration in the glomerulus, renal vein has the clean or filtered blood.

Multiple choice

Blood vessel carrying the blood out of glomerulus is __________.

  1. efferent renal artery

  2. pulmonary artery

  3. renal vein

  4. vasa recta
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each human kidney has about one million structural and functional units called nephrons. Each nephron is made up of 2 main parts: malphigian body and renal tubule. Malphigian body comprises a cup shaped Bowman's capsule and a network of blood capillaries (glomerulus). The renal artery, after entering the kidney, divides and redivides forming various afferent renal arterioles. This renal artery brings dirty blood containing waste substances. An afferent arteriole enters Bowman's capsule to form glomerulus. The efferent renal arteriole has narrower lumen than the afferent renal arteriole. Thereafter, an efferent renal arteriole leaves the glomerulus. The efferent renal arteriole breaks up into capillaries around the tubules. All the capillaries, in turn, unite to form renal venules and the latter together form the renal vein, which leaves the kidney. Vasa recta are the capillaries around this loop of Henle. The vasa recta help to retain reabsorbed ions and urea.

Multiple choice

The blood vessel that receives back the reabsorbed material is ___________.

  1. efferent renal artery

  2. pulmonary artery

  3. glomerulus

  4. vasa recta
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Each human kidney has about one million structural and functional units called nephrons. Each nephron is made up of 2 main parts: malphigian body and renal tubule. Malphigian body comprises a cup shaped Bowman's capsule and a network of blood capillaries, the glomerulus. The renal artery after entering the kidney divides and redivides forming various afferent renal arterioles. An afferent arteriole enters a Bowman's capsule to form glomerulus. The efferent renal arteriole has narrower lumen than the afferent renal arteriole. Thereafter, an efferent renal arteriole leaves the glomerulus. The efferent renal arteriole breaks up into capillaries around the tubules. All the capillaries, in turn, unite to form renal venules and the latter together form the renal vein, which leaves the kidney. Vasa recta are the capillaries around this loop of Henle. The vasa recta help to retain reabsorbed ions and urea.

Multiple choice

Which of the following does not characterise the cardiovascular system of the body?

  1. The cardiovascular system distributes electrolytes to the body cells and nullifies thermoregulation.

  2. Blood re-enters the heart through the vena cave

  3. Perfusion of the systemic circulation requires a much higher pressure.

  4. The systemic and pulmonary circulations are perfused in series.

  5. The elastic arteries are the aorta and its major branches.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The key functions of the cardiovascular system are distribution of O2, water, electrolytes and nutrients to all body tissues, transportation of CO2 and metabolic waste products from the tissues to the lungs and kidneys and thermo regulation.

Multiple choice

The tissue plasminogen factor is applicable for

  1. dissolving the unwanted blood clots

  2. treatment of diabetes

  3. viral diseases

  4. treatment of heamopilias

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plasminogen adopts an open form that can be converted into active plasmin by a variety of enzymes, including tissue plasminogen activator (tPA), urokinase plasminogen activator (uPA), kallikrein and factor XII.

Multiple choice

Pulmonary artery of frog carries

  1. Pure blood

  2. Impure blood

  3. Mixed blood

  4. Blue blood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pulmonary artery in frogs (and all vertebrates) carries deoxygenated blood from the heart to the lungs for oxygenation. Unlike mammals, frogs have a three-chambered heart, but the pulmonary artery still carries impure (deoxygenated) blood.

Multiple choice

Which of the following substances, if introduced into the blood stream, would cause coagulation of blood at the site of its introduction?

  1. Thromboplastin

  2. Fibrinogen

  3. Heparin

  4. Prothrombin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Thromboplastin is a plasma protein aiding blood coagulation through catalyzing the conversion of prothrombin to thrombin. So, if introduced into the blood stream, it would cause coagulation of blood at the site of its introduction.

Multiple choice

Students were asked about the function of pulmonary artery, only one student could answer it correctly. Which of the following options show this answer?

  1. It carries oxygenated blood from the heart to different organs.

  2. It carries deoxygenated blood from the organs to the heart.

  3. It carries oxygenated blood from the lungs to the heart.

  4. It carries deoxygenated blood from the heart to the lungs.

  5. None of the options show the correct answer.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is the correct answer. Pulmonary vein and artery are exceptions, there functions are the reverse of what the veins and arteries perform.

Multiple choice

Which of the following options show the correct path of blood flow?

  1. From the body → Right Auricle → Right Ventricle → Pulmonary Artery → Lungs → Pulmonary Vein → Left Auricle → Left Ventricle → To the body

  2. From the body → Left Auricle → Left Ventricle → Pulmonary Artery → Lungs → Pulmonary Vein → Right Auricle → Right Ventricle → To the body

  3. From the body → Right Auricle → Right Ventricle → Pulmonary Vein → Lungs → Pulmonary Artery → Left Auricle → Left Ventricle → To the body

  4. From the body → Right Auricle → Right Ventricle → Pulmonary Artery → Lungs → Pulmonary Vein → Left Auricle → Left Ventricle → To the body

  5. From the body → Right Auricle → Left Auricle → Pulmonary Artery → Lungs → Pulmonary Vein → Left Ventricle → Right Ventricle → To the body
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. The upper chambers are called auricle or atrium. The lower chambers are called ventricles. Left side of the heart had oxygenated blood and right has the deoxygenated blood.