Once the blastocyst has implanted in the uterus, it is called an . after eight more weeks of development, it is called a .

Once the blastocyst has implanted in the uterus it is called an embryo.  After eight more weeks of development it is called a fetus.

it is called an embryo and adter 8 weeks of development it is called a fetus

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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