Through which parts of the heart does oxygen poor blood flow

The deoxygenated blood enters the heart through the superior and inferior vena cava and into the right atrium. the blood then travels through the right atrioventricular (AV) or tricuspid valve into the right ventricle. from there it goes through the pulmonary semilunar valve and into the pulmonary artery to be carried to the lungs to become oxygenated.

therefore the deoxygenated blood will travel through:

• the superior and inferior vena cava
• the right atrium
• the atrioventricular/tricuspid valve
• the pulmonary semilunar valve
• the pulmonary artery

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.