Lumen
Aorta
Capillaries is the answer in this question
The intima
The dorsal blood vessel is located on top of the intestinal track in a worm.
lumen - the central opening within a tube or hollow organ.
The opening through which menstrual flow flows is the vaginal opening. Menstrual flow leaves the uterus via the cervix and then passes through the vaginal canal.
Lumen
resistance occurs as the blood flows away from heart through the vessels in the peripheral systemic circulation a term known as peripheral resistance. Viscosity of the blood (thickness) ,vessel length (distance) and vessel diameter (blood vessel radius) are three factors
Vent
Connective tissue flows through the heart and blood vessels.
The average velocity of the blood as it flows through a capillary is 0.00047 m/s.
When blood flows through the vena cava, it enters the right atrium of the heart. From the right atrium, the blood then moves into the right ventricle. Once the right ventricle contracts, the blood is pumped into the pulmonary artery, which carries it to the lungs for oxygenation.