Double Circulation

Which one of the following vertebrate organs receives the oxygenated blood only?

Explain coronary circulation of the human body.

Coronary veins open into coronary sinus.

Which of the following circulation regulates the blood supply to the heart in the body of a human?

Coronary arteries supply blood to the  _____ (liver/heart).

Pulmonary arteries supply blood to the heart.

Define the portal system of the human body.

Which of the following system is a portal system?

_____ (Portal/Lymphatic) vessels start in capillaries and end in capilleries.

Hepatic portal system is present between digestive tract and kidneys.

Study the following table:

Assertion (A): In human heart, deoxygenated blood always flows from right ventricle into pulmonary arch only

Reason (R): Mitral valve present at the base of pulmonary arch prevents the reverse flow of blood

The following characteristic features of circulatory system and heart types were found different animals, $\mathrm{A}$ and $\mathrm{B}$
A) deoxygenated and oxygenated bloods are received by the heart separately but mixed blood will be pumped out from the heart
B) the oxygenated and deoxygenated bloods are received by the heart and the unmixed blood is pumped out separately
i) double circulation and $3$-chambered heart
ii) incomplete double circulation and $4$-chambered heart
iii) double circulation and $4$-chambered heart
iv) incomplete double circulation and $3$-chambered heart

Which of the following condition is correct?

The hepatic portal vein drains blood to the liver from;

Hepatic portal vein is found in

A portion of the cardiovascular system that transports oxygen-depleted blood from the heart to the lungs and brings oxygenated blood back to the heart is referred as

Write the correct biological term which carries blood from the lungs to the heart.

What is double circulation?

Define double blood circulation.