Page 3 â Measuring time in different cultures. Measuring time. Scientifically, the year is a complete cycle of seasons. A year is when the earth completes one full orbit of the sun. Its length is measured from one spring equinox to the next spring equinox. Measuring the time of year was important to most people. Knowing the season was vital when deciding to plant and harvest crops as well as managing livestock in colder climates.
Experts have believed for a long time that pregnancy weakens a womanâs immune system, making her more susceptible to illnesses like the flu. However, research released just before the start of this flu season indicates that, in the case of the flu, the opposite may be true during pregnancy.
Your iron requirements go up significantly when you're pregnant. Iron is essential for making hemoglobin, the protein in red blood cells that carries oxygen to other cells. During pregnancy, the amount of blood in your body increases until you have almost 50 percent more than usual.And you need more iron to make more hemoglobin for all that additional blood.You also need extra iron for your growing baby and placenta.uring pregnancy, the amount of blood in your body increases until you have almost 50 percent more than usual. And you need more iron to make more hemoglobin for all that additional blood. You also need extra iron for your growing baby and placenta.