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 hepatic portal system components of the circulatory system transport in animals the circulatory system biology

Which of the following vessel in rabbit starts with capillaries and ends in capillaries?

  1. Pulmonary artery

  2. Renal vein

  3. Hepatic portal vein

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

The hepatic portal system includes the veins that drain blood from capillaries in the spleen, stomach, pancreas, and intestine. Instead of emptying their blood directly into the inferior vena cava, they deliver it by way of the hepatic portal vein to the liver. Upon entering the liver, the portal vein divides and sub-divides into ever smaller branches. Eventually, the portal blood flows into a vast network of sinus like vessels called sinusoids. These are enlarged capillaries that serve as blood channels within the tissues of the liver, spleen, thyroid gland, and other structures. After leaving the sinusoids, blood is finally collected by the hepatic veins, which empty into the inferior vena cava. 

So, the correct answer is option C.

Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology

The veins starting from the stomach and intestines do not directly convert the blood to the posterior vena cava. Instead, they first enter the ........... as a combined hepatic portal vein.

  1. Kidney

  2. Pancreas

  3. Spleen

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

The hepatic portal vein carries blood from the spleen and intestines into the liver. The veins from the spleen and intestines break into capillaries before entering the liver as the hepatic portal vein. 

So, the correct answer is option C.

Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology

Which of the following is an example of portal vein?

  1. Renal portal vein

  2. Hepatic portal vein

  3. Both A and B

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

The hepatic portal vein carries blood from the spleen and intestines into the liver. The veins from the spleen and intestines break into capillaries before entering the liver as the hepatic portal vein.

The renal portal vein is involved in the movement of the blood from the renal glomeruli to the peritubular plexus that surround the proximal and distal convoluted tubules.
So, the correct answer is option C.

Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology

A portal system is one in which

  1. A vein starts from an organ and ends up in heart.

  2. A vein starts from an organ and ends up in another organ.

  3. A vein starts from heart and ends up in lungs.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
There are two types of portal systems they are Hepatic portal systems and renal portal system. In Hepatic (liver) portal system a vein collects blood from the intestine and passes it to the liver and in renal (kidney) portal system a vein collects blood from renal glomeruli and passes it to peritubular plexus (the blood capillaries that surrounds the proximal and distal convoluted tubules). Both hepatic and renal portal systems are found in fishes, amphibians, and reptiles. In mammals only hepatic portal system is present. Hence A portal system is one in which A vein starts from an organ and ends up in another organ.
So, the correct answer is 'A vein starts from an organ and ends up in another organ'.
Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology


The hepatic portal vein is located between the:-

  1. hepatic vein and the vena cava

  2. small intestine and the liver

  3. mouth and the stomach

  4. pancreas and the small intestine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Measuring approximately 8 cm (3 inches) in adults, the portal vein is located in the right upper quadrant of the abdomen, originating behind the neck of the pancreas. In most individuals, the portal vein is formed by the union of the superior mesenteric vein and the splenic vein

So, the correct answer is 'small intestine and the liver'

Multiple choice hepatic portal system components of the circulatory system transport in animals the circulatory system biology

The circulatory system of a rabbit differs from that of a frog in that there 

  1. Renal portal system in rabbit

  2. Hepatic portal system in rabbit

  3. Posterior vena cava in rabbit

  4. Dorsal aorta in rabbit
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The renal portal system is absent in the rabbit. The hepatic portal system is present in rabbit and it consists of a hepatic portal vein ventral to the post caval vein. It enters into the liver, divides into a number of branches to supply to various lobes of the liver.
  • In the rabbit, the blood from different organs of the body is collected by two superior vena cavae and a posterior vena cava which open separately into the right auricle.
  • In Frog, the blood from different organs of the body is collected by two precavals and one post caval which unite together to form a sinus venosus that in turn opens into the right auricle.

So, the correct answer is 'Posterior vena cava in rabbit'.

Multiple choice biology diversity in living things and their classification oviparous and viviparous number and shape of cells unicellular and multicellular organisms

In non chordates, blood flow is _________ is ventral vessel and __________ in dorsal vessel.

  1. Backward, backward

  2. Backward, forward

  3. Forward, backward

  4. Forward, forward
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In most non-chordates (like earthworms), the blood flow in the ventral vessel is directed forward (anteriorly) and in the dorsal vessel, it is directed backward (posteriorly).

Multiple choice biology excretion - the wastage disposing system artificial kidney kidney transplant disorders of kidney

The renal artery of the new kidney, which is previously connected from the abdominal aorta in the donor will be connected to ........... artery in the recipient.

  1. Superior vena cava.

  2. External iliac.

  3. Inferior aorta.

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

During a kidney transplant usually the failed kidney is not removed instead the transplanted kidney is placed in the iliac fossa (cavity) Conventionally, the kidney receives blood from the renal artery and the renal vein drains blood into the inferior vena cava. However, since the kidney is placed in the iliac fossa that receives blood from the external iliac artery the transplanted kidney is connected to the external iliac artery and accordingly to the external iliac vein. This is also done to make the further surgeries, if required to be less complicated. So, the correct answer is 'External iliac'

Multiple choice biology excretion - the wastage disposing system artificial kidney kidney transplant disorders of kidney
The renal vein of the new kidney is connected to the ......................... in the recipient, which in the donor, drains blood to the inferior vena cava.

  1. External iliac vein

  2. Internal iliac vein

  3. Vena cava

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

Answer is option B i.e."Internal iliac vein"
The internal iliac vein drains blood from the visceral organs in the pelvic region. The internal iliac vein may double all these veins and tributaries join together to form the inferior vena cava.

Multiple choice zoology respiration in organisms respiration in human beings respiration and associated structures respiration in humans

....... circulation is related with lungs.

  1. Coronary

  2. Biliary

  3. Pulmonary

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

The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta.The deoxygenated blood pumped into the pulmonary artery is passed onto the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium. This pathway constitutes the pulmonary circulation. 

Multiple choice biology chemical coordination and integration kidney hormones coordination in human beings- chemical control endocrine system in humans

Which one increases glomerular pressure?

  1. Renin

  2. Angiotensin

  3. Aldosterone

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

  • Angiotensin is a polypeptide that narrow blood vessels and thus regulates arterial pressure. 
  • Angiotensin not only constricts blood vessels all over the body in order to increase systemic blood pressure, but it also works in the kidneys in order to maintain blood pressure in the glomerulus(glomerular pressure) so that the glomerular filtration rate stays normal even in the condition when blood pressure is low. Hence, angiotensin increases glomerular pressure.
So, the correct answer is 'angiotensin'.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Humans have a

  1. Closed circulatory system

  2. Circulatory system

  3. Open circulatory system

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

The circulatory patterns are of two types open or closed. Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. Annelids and chordates (example humans) have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels. This pattern is considered to be more advantageous, as the flow of fluid can be more precisely regulated.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

In closed circulatory system, blood is enclosed by

  1. Tubes

  2. Ducts

  3. Valves

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

In closed circulatory system, blood flows through closed chambers called as vessels. In open circulatory system, the blood flows in the closed vessel which further opens into a body cavity called haemocoel.

So, the correct answer is option D.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

In circulatory system, valves occur in

  1. Heart and blood vessels of both vertebrates and invertebrates as well as vertebrate lymphatics

  2. Both vertebrate and invertebrate hearts

  3. Vertebrate heart only

  4. Both vertebrate and invertebrate hearts and their blood vessels.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Valves are essential in circulatory systems to ensure unidirectional flow. They are found in the hearts of vertebrates, the lymphatics of vertebrates, and in various vessels of both vertebrates and some invertebrates.