aorta and pulmonary artery
The right ventricle empties into the pulmonary arteries and the left ventricle empties into the aorta.
Blood enters the coronary arteries just above the aortic semilunar valve. After systole (a ventricular contraction), the valve closes. The closing valve causes blood to back flow against the valve. At this time, the backward flow of blood enters into the coronary arteries.
Oxygen is the gas that enters the blood during inspiration. It is taken into the lungs from the outside air and then diffuses into the blood vessels in the lungs.
Right ventricular systole is pumping blood into the PULMONARY ARTERIES just as left ventricular systole is pumping blood into the AORTA -- both at the same time.Source: http://library.med.utah.edu/kw/pharm/hyper_heart1.htmlIn right ventricular systole, the blood enters the pulmonary trunk before proceding into the pulmonary arteries.
Aorta
haemoglobin
Point where optic nerve enters eyeball is the optic disc.
skin surface (integumantary system) and the lungs (alveoli) .
Once interstitial fluid enters the collecting vessels, it is called lymph. Lymph is a clear fluid that contains white blood cells and proteins, and it plays a crucial role in the immune system by transporting these cells and proteins throughout the body.
Blood vessels, nerves, and connective tissue enter the tooth through the apical foramen.
Water enters the leaf through the roots and moves up through the stem to the leaves via the xylem vessels. Once in the leaf, water moves through the mesophyll cells and eventually evaporates from the stomata as water vapor during transpiration.
Oxygen enters the blood through the thin walls of the alveoli in the lungs during the process of respiration. This occurs through a process called diffusion, where oxygen moves from an area of high concentration in the alveoli to an area of lower concentration in the blood vessels surrounding the alveoli.