Question

Foramen of panizzae is found in the heart of
(a) Rabbit
(b) Pigeon
(c) Crocodile
(d) Frog

Answer 1

Hint: Heart is the muscular organ that is responsible for sustaining life in living organisms. Its size is about the clenched fist and is the hardest working muscle in the human body. It is found in that organism that comes under reptilians and consists of a four-chambered heart.

Complete step by step answer:
In the heart of the crocodile, the Foramen of panizzae is found. It connects the left and right aorta in the heart of all animals of order crocodilia. The heart of the crocodile is different from other reptiles as they both atria and ventricles are completely separated in them. A hole is connected between the artery and vein which is known as the foramen of panizzae. It is when the crocodile holds its breath and allows blood to bypass within the lungs when the animals get submerged. The structure of the foramen of panizzae has the effect of stabilizing blood oxygen levels.

Additional information:
Rabbit: Rabbits have a four-chambered heart with two atria and two ventricles. The ventricles are larger in size than the auricles whereas the auricles have thin walls as compared to the ventricles. The ventricles and oracles are separated by an interauricular septum. The right ventricle of the rabbit contains an aperture which is known as the sinu-auricular aperture. The auriculo- ventricular aperture allows the opening of the right and left auricle. The aperture is guided by an auriculo ventricular valve which has 4 flaps.

Pigeon: Pigeon has a four chambered heart which includes two auricles and two ventricles. The sinus venosus is absent in pigeons. Pigeon has a large sized heart which is reddish in color and triangular in shape. It is compact to analyze mid ventrally in the thorax. The heart is enclosed in a thin transparent membrane which is known as the pericardium. The pericardial layer is the outer parietal layer and inner visceral layer. The fluid inside the pericardium protects the heart from shocks and injuries and allows movement during the beating.
Frog: Frog has a three-chambered heart with one ventricle and two atria. Blood from the heart leaves the heart from the ventricle through truncus arteriosus. Truncus arteriosus is a short and branches into aortic arches with left loop and right. It is dorsal to the heart and mid-dorsal in the region of the body cavity. The contraction of the heart originates in the muscle itself and the heart is known as myogenic.
So, the correct answer is 'Crocodile'.

Note: The size of a human heart is of a fist and that of a cow is of a human head. The largest heart of animals is the blue whale which is about 400 pounds. The fairy flies have the smallest heart which is about 0.006 inches long. Earthworm has 5 pairs of hearts which make up a total of 10 hearts.