Tag: the circulatory system

Questions Related to the circulatory system

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

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

  1. Pulmonary artery

  2. Renal vein

  3. Hepatic portal vein

  4. Renal artery

Show answer
Correct Option: C
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.

Hepatic portal system connects

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

  1. Digestive system to liver.

  2. Kidney to liver.

  3. Liver to digestive system.

  4. Liver to kidney.

Show answer
Correct Option: A
Explanation:
The venous system comprising of the hepatic portal vein and other veins. It is responsible for directing blood from the region of the gastrointestinal tract between the esophagus and rectum and also includes venous drainage from the supplementary organs such as the spleen to the liver. The hepatic system is so named since it connects capillaries of the intestine and other digestive organs to modified capillaries (hepatic sinusoids) of the liver. As intestinal blood is nutrient rich for few hours after having a meal, this system is able to detect available nutrients before the blood goes to rest of the body. It also plays the role in cleansing the blood by removing the bacteria and toxins present in it. Thus, the correct answer is option A.

Mark the correct statement about lymph.

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

  1. It Maintains the volume of blood.

  2. It destroys the invading microbes.

  3. Both A and B are true for lymph

  4. None of these

Show answer
Correct Option: C
Explanation:

Lymph acts as middle man which transports food materials, oxygen, hormones etc. to the body cells and brings carbon dioxide and other metabolic wastes from the body cells to blood and then finally pours the same into venous system. It destroys the invading germs and it maintains the volume of blood.

Middle man of blood is _______

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

  1. RBCs

  2. Lymph

  3. Platelets

  4. Serum

Show answer
Correct Option: B
Explanation:

Lymph acts as middle man which transports food materials, oxygen, hormones etc to the body cells and brings carbon dioxide and other metabolic wastes from the body cells to blood and then finally pours the same into venous system.

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.

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

  1. Kidney

  2. Pancreas

  3. Spleen

  4. Liver

Show answer
Correct Option: D
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.

Which of the following is an example of portal vein?

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

  1. Renal portal vein

  2. Hepatic portal vein

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
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.

Artificial pacemaker is implanted subcutaneously for correcting

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

  1. 90% blockage of coronary arteries

  2. High blood pressure

  3. Arteriosclerosis

  4. Irregularity of heart rhythm.

Show answer
Correct Option: D

A portal system is one in which

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

  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.

Show answer
Correct Option: B
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'.

Both hepatic and renal portal systems are found in

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

  1. Fishes, amphibians, reptiles

  2. Amphibians, reptiles, mammals

  3. Reptiles, aves, mammals

  4. Cyclotomes, fishes, amphibians

Show answer
Correct Option: A
Explanation:

Hepatic (liver) portal system collects blood from the intestine and passes it to the liver and renal (kidney) portal system 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.

So, the correct answer is 'Fishes, amphibians and reptiles'.

Valve surrounding opening of coronary sinus is

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

  1. Thebesius valve

  2. Eustachian valve

  3. Mitral valve

  4. Semilunar valve.

Show answer
Correct Option: A