Immediately after fertilization, the egg is called a
fetus

blastocyst

embryo

zygote

Immediately after fertilization, the egg is called a zygote.  It is called a zygote until it divides into 16 cells. Embryo is first stage of the zygote’s development where its cells multiply to form their designated functions (differentiation), while fetus refers to a point in the embryo’s development where it takes on a more human form, and some bodily functions begin to work.

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.