Frogs: Anatomy (Circulatory System) Structural Organisation in Animals - Iris - (New NCERT) Structural Organisation in Animals Masterclass in Biology 3 NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Frogs have three-chambered hearts. What is correct regarding circulatory pathways in frogs?

I:	Oxygenated blood from the lungs and de-oxygenated blood from the respiring tissues enter the heart through separate atria.
II:	When atria contract, the two blood streams pass into a common ventricle.
III:	From the ventricle the blood is pumped via a spiral valve to the appropriate vessel, the aorta for oxygenated blood and pulmonary artery for deoxygenated blood.

1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect

Subtopic: Frogs: Anatomy (Circulatory System) |

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