Question

Four chambered hearts are present, in which of the following reptiles?
A. Lizard
B. Snake
C. Scorpion
D. Crocodile

Answer 1

Hint:-Four chambered hearts consist of two atria and two ventricles. Blood circulation, in this type of heart, is double circulation with the pulmonary and systemic circulation. The blood enters twice through the heart in this cycle, which arrests deoxygenated blood and the oxygenated blood from getting fused, and the circulation is maintained accurately.

Complete step-by-step solution:-
Three chambered hearts are found in lizards and snakes, this three-chambered heart is composed of left and right atria and a single ventricle.
Scorpions do not come in the categories of reptiles; it comes in the category of arthropods. The seven chambers heart is found in scorpions, one in each of these segments. This tubular heart is present in the mid-dorsal zone and extends between the eighth and fourteenth segments. The heart lies down within a haemocoelomic space called the pericardium. Each chamber is connected with the pericardial cavity by means of a pair of valve-like openings, Ostia.
The crocodile represents a four-chambered heart like birds and mammals. Their heart has two ventricles and two aortae. Aorta is found at both the right and left side that is connected by a hole called the foramen of Panizza. They have heart valves that direct blood flows in one direction through the heart chambers.
As per the above discussion the correct answer of these questions D, Crocodile, and I hope you guys will make sure why other options are incorrect.

Note:- The crocodile valve has cog teeth composed of nodules of connective tissue, i.e. totally different from the flap-like valves in other vertebrates, these cog teeth mesh jointly, diverting blood away from the lungs and into their bodies. The researchers have also found that these teeth are regulated by the amount of adrenaline in the bloodstream.