The feline sense of smell is enhanced by a structure in its mouth known as organ.

The given blank can be filled with Jacobson's.

Explanation:

The vomeronasal organ, also known as the Jacobson's organ, refers to an organ of chemoreception, which is a component of the olfactory system of reptiles, amphibians, and mammals. However, it is not witnessed in all the tetrapod groups. It is a sensory cell patch found inside the main nasal passage, which determines heavy moisture-originated odor particles.  

Airborne smells, in comparison, are determined by the olfactory sensory cells situated in the prime nasal chambers. Some mammal groups also exhibit a behavior called flehman response, in which the animal facilitates the exposure of the vomeronasal organ to a pheromone or scent by curling the upper lip and opening the mouth at the time of inhalation.  

In completely developed turtles, crocodilians, cetaceans, birds, and various advanced primates, this composition is not found or is substantially underdeveloped.  

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.