Molecules that are too large to pass through the pores of a cell membrane may enter the cell by a process known as

facilitated diffusion.

Explanation:

molecules, such as lipids can pass through the cell membrane by simple diffusion.

NOTE: Simple diffusion permits the passage of only small and non polar molecules across the cell membrane.

Facilitated diffusion permits the passage of large and polar molecules across the cell membrane.

The process is facilitated diffusion.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.