Phospholipids serve a major function in the cells of all organisms: they form the phospholipid membranes that surround the cell and intracellular organelles such as the mitochondria. The cell membrane is a fluid, semi-permeable bilayer that separates the cell's contents from the environment, see animation below.ipid molecules are slightly soluble to insoluble in water. Lipids are hydrophobic because the molecules consist of long, 16-18 carbon, hydrocarbon backbones with only a small amount of oxygen containing groups.
The short answer? No, while in the womb, a fetus doesn't poop â although it does pee. However, some waste does accumulate in its lower intestine throughout the pregnancy, which is a result of nutrients received from the mother via the umbilical chord. Called meconium, the fetus does not poop this while in the womb. The fetus will excrete this sticky, greenish waste shortly after birth.
Hard, Pebble-like Baby Poop. Your baby may be constipated if his or her poop is hard and looks like pebbles. Babies can become constipated when they are being introduced to solid foods. This could also be a sign of sensitivity to milk or soy, or a lack of tolerance to something in breast milk or formula.ard, Pebble-like Baby Poop. Your baby may be constipated if his or her poop is hard and looks like pebbles. Babies can become constipated when they are being introduced to solid foods. This could also be a sign of sensitivity to milk or soy, or a lack of tolerance to something in breast milk or formula.