Through the umbilical cord and the placenta.
placenta
The cardiovascular system transports nutrients and wastes.
Via the umbilical vein which connects to the placenta in the womb of the host mother
The fetus is connected to its mother by an umbilical cord. The mother's blood carries nutrients through the umbilical cord to the fetus and carries away wastes from the fetus.
Wastes and nutrients are carried in the blood and diffuse across the capillary walls.
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The circulatory system brings nutrients and wastes to and from the bone. These systems work closely together to maintain homeostasis.
Capillaries are the site of diffusion of materials between the body tissues and the blood stream. These materials include nutrients, oxygen, and wastes.
The cell membrane is the part of the cell that controls what enters and leaves the cell. It allows nutrients to come in and wastes to move out.
A capillary is a blood vessel that is one cell thick for the absorption of nutrients and removal of wastes.
The umbilical cord is attached to the developing fetus at the navel, and it has two main blood vessels in it; the umbilical artery and the umbilical vein. These vessels form a network of capillaries at the placenta, which is the temporary organ on the wall of the mother's uterus which forms during pregnancy. In the placenta, the mother's blood vessels also narrow to capillaries. The baby's capillaries and the mother's capillaries come side by side, and in that way metabolic wastes diffuse from the baby's blood to the mother's blood so her body can excrete them, and the baby's blood picks up O2 and nutrients from the mother's blood. The umbilical cord is the connection between the baby and the mother, and the placenta is the area in a pregnant woman's uterus which is the site of exchange of various wastes and nutrients between mother and child. The baby's blood and the mother's blood, however, never directly mixes. Everything is accomplished via diffusion between the capillaries in the placenta.
As a cell gets larger, it is harder for it to process nutrients. The increase of the volume of a cell also hinders a cell's ability to obtain nutrients.