Na reflex arc, the sensory neurons are neurons, while the motor neurons are neurons

In a relfex arc, the sensory neurons are also known as afferent neurons, while the motor neurons are known as efferent neurons. Afferent neurons because they bring in the signal from the sensory organs or sensory receptors to the brain. The neurons that carry information from the brain or the spinal cord to the muscles for making a movement are called efferent neurons.

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.