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 bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

The waste matters (urea) are transported by

  1. Blood

  2. Lymph

  3. RBC

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Urea is synthesized in the liver from ammonia and carbon dioxide. The urea synthesis is a five-step cyclic process, with five distinctive enzymes. This urea is released into the bloodstream from the liver cells. Through blood, urea is transported to kidneys where the blood is filtered and urea is passed out of the body in the urine. Hence the waste matters (urea) are transported by the blood.

So, the correct answer is 'Blood'.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

pH of blood in arteries and veins is

  1. Higher in arteries and lower in veins

  2. Higher in veins and lower in arteries

  3. Same

  4. Variable in both
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
pH of blood in the arteries is greater than that of the veins as the venous blood contains dissolved $CO _2$, lactic acid and other metabolic waste that makes the venous blood more acidic.
So, the correct answer is 'Higher in arteries and lower in veins'
Multiple choice biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

Cystic artery supplies blood to

  1. Kidney

  2. Heart

  3. Gall bladder

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The common hepatic artery further bifurcates into the left and right hepatic arteries to deliver blood the left and right sides of the liver. As the right hepatic artery approaches the gallbladder, it branches off to form the cystic artery, which supplies the gallbladder and cystic duct with oxygenated blood. Hence, the cystic artery supplies blood to the gall bladder.

So, the correct answer is 'gall bladder'.
Multiple choice biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

Before the blood carrying the products of digested food, returns to heart, it first passes through capillary network in the 

  1. Liver

  2. Kidneys

  3. Brain

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

Blood is carried to the liver via two large vessels: the hepatic artery carries oxygen-rich blood from the aorta, and the portal vein carries blood containing digested food from the small intestine. The hepatic portal vein is a blood vessel that conducts blood from the gastrointestinal tract and spleen to the liver. This blood is rich in nutrients that have been extracted from food, and the liver processes these nutrients; it also filters toxins that may have been ingested with the food. The liver receives about 75% of its blood through the hepatic portal vein, with the remainder coming from the hepatic artery proper. The blood leaves the liver to the heart in the hepatic veins.

Multiple choice biology digestion and absorption digestive system- glands mouth and buccal cavity digestive glands

The exchange of materials between the blood and the interstitial fluid occurs only in the

  1. Veins

  2. Capillaries

  3. Arteries

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

Capillaries are essential for the delivery of oxygen to the tissues and the exchange of nutrients between blood and interstitial fluid surrounding the cells. This function is well supported by the anatomy of the vessels. The thin walls of the capillaries are composed of a single layer of endothelial cells. As a result, gasses such as oxygen and carbon dioxide can diffuse through their walls, as can lipid soluble substances.
Capillaries also play an important role in regulating the relative volume of the blood and interstitial fluid by allowing a bulk flow through their walls. This exchange of water and solutes occurs in response to the pressure gradient across the capillary wall.
Therefore, the correct answer is option B.

Multiple choice zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

It opens into right auricle in frog heart Coronary sinus _______________.

  1. Drains impure blood from pulmonary veins to left auricle

  2. Receives impure blood from heart musculature via coronary veins

  3. Drains pure blood in right auricle

  4. More than one options are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

The venous system of frog differs from that of a mammals in the presence of

  1. Renal portal system

  2. Hepatic portal system

  3. Three superior venacava

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

The renal portal system is involved in the function to move blood from the renal glomeruli to the peritubular plexus that surround the proximal and distal convoluted tubules. The renal portal system is found only in fishes, amphibians, reptiles and birds. Thus, mammals have no renal portal system. 

So, the correct answer is option A.

Multiple choice zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

Select the correct option:

Fill up the blanks in the following paragraph by selecting the correct option.
The vascular system of frog is well-developed ______ (i) type. The blood vascular system involves heart, blood vessels and blood. Heart has 3 chambers, two atria and one ventricle and is covered by a membrane called ______ (ii). A triangular structure called ______ (iii) joins the right attrium.

  1. (i)- open; (ii)- conus arteriosus; (iii)- neurilemma

  2. (i)- closed; (ii)- sinus venosus; (iii)- pericardium

  3. (i)- open; (ii)- neurilemma; (iii)- conus arteriosus

  4. (i)- closed ; (ii)- pericardium; (iii)- sinus venosus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The vascular system of frog is well-developed (i) 'closed' type. The blood vascular system involves the heart, blood vessels and blood. The heart has 3 chambers, two atria and one ventricle and is covered by a membrane called (ii) 'pericardium'. A triangular structure called (iii) 'sinus venosus' joins the right atrium.

So, the correct answer is '(i)- closed ; (ii)- pericardium; (iii)- sinus venosus'.

Multiple choice bio-chemistry blood circulatory system of human role of blood in transport function of blood body fluid

Heart is a ................ pumping organ. 

  1. Blood

  2. Lymph

  3. Plasma

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the body, the heart is muscular organ made up of cardiac muscles which has four chambers. The right side of the heart receives deoxygenated blood from the veins and pumps it to the lungs that oxygenates it.The left side of the heart receives oxygenated blood from the lungs and pumps it through the arteries to all body. Thus the correct answer is option A.

Multiple choice botany biotechnology: general introduction microbiology: organisms in industry biotechnology commercial applications of biotechnology

The enzyme TPA or tissue plasminogen activator is used for

  1. Dissolving blood clots

  2. Maintaining plasma content

  3. Clearing turbidity of juices

  4. Stimulating thromboplastin production
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tissue plasminogen activator is a clot-dissolving enzyme that is produced naturally by cells in the walls of blood vessels and catalyzes the conversion of plasminogen to plasmin. A preparation of this enzyme is produced by genetic engineering and used to dissolve clots blocking coronary arteries in heart attack and cranial arteries in certain cases of stroke.

Multiple choice zoology animal diversity - ii (phylum: chordata) vertebrates characteristics of vertebrates classification of organisms

Find the incorrect statement.

  1. Lymphatic system is present in vertebrates and lymph is finally carried to the veins

  2. All vertebrates have a single heart, enclosed in pericardium

  3. Heart of fish receives only venous blood which is pumped into lungs for oxygenation

  4. Reptilian heart is arteriovenous heart that shows incomplete double circulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement A is correct, but the question asks for the incorrect statement. Statement B is incorrect because while most vertebrates have a heart, the number of chambers varies significantly (e.g., fish have two, amphibians three, birds/mammals four), and the term single heart is misleading in the context of evolutionary complexity.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Heart of the prawn carries

  1. Oxygenated blood

  2. Deoxygenated blood

  3. Mixed blood

  4. No blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood vascular system of prawn is 'open type'. It lacks capillaries and veins. The heart pumps pure blood in arteries, which divide and redivide  into very small branches of arteries and open freely in haemocoel. The blood flows through these sinuses or blood lacunae into the entire body. All blood sinuses open into a pair of long but indistinct ventral sinus. Afferent branchial channels carry impure blood from ventral sinuses to gills, where it is purified (oxygen dissolved in water inside gills is taken in blood by diffusion and carbon dioxide present in blood is diffused out in water). The pure blood from each side of gills is conveyed to pericardial sinus by efferent branchial channels and is then returned to the heart. Thus, the heart always contains oxygenated blood, though the arteries contain mixed blood.

Multiple choice evolutionary changes in heart transportation - the circulatory system

Heart of fish receive

  1. Oxygenated blood

  2. Deoxygenated blood

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fishes have a 2-chambered heart, with an atrium and a ventricle. In fishes, the heart pumps out deoxygenated blood, which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart. It is called as single circulation.