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 atrium.

(i) open (ii) conus arterious (iii) neurilemma

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(i) closed (ii) sinus venosus (iii) pericardium

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(i) open (ii) neurilemma (iii) conus arterious

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(i) closed (ii) pericardium (iii) sinus venosus

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Solution

The correct option is D (i) closed (ii) pericardium (iii) sinus venosus
The vascular system of frog is the 'closed' type which means frogs only have one heart to pump blood throughout the body. The blood never leaves the blood vessels.
Pericardium is the membrane that covers the heart.
Sinus venosus is a triangular chamber attached dorsally to the heart. It joins the vena cava with the right atrium.

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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.

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Q. Explain the following:
(i) Why is the SA node called the pace-maker of the heart?
(ii) Why is there no mixing of deoxygenated and oxygenated blood in the human heart normally?
(iii) Why is the closed circulatory system more efficient than the open system?
(iv) Why does the left ventricle posses a thicker wall than the right ventricle?

Q. Choose the correct statements :
I. The heart is a hollow organ present in the thoracic cavity
II. The pulmonary veins are guarded by valves which prevent the backflow of blood.
III. The walls of the left ventricle are about three times thicker than the right ventricle.
IV. Pulmonary arteries carry deoxygenated blood to the lungs
V. The foetal heart has an opening between two atria

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