Final answer:
The dose of insulin is not the same in all three trimesters of pregnancy due to changing insulin resistance, especially during the third trimester when the demand for glucose is higher.
Step-by-step explanation:
The statement 'If insulin is used, the dose is the same in all 3 trimesters' is false. During pregnancy, insulin requirements may change. In particular, the third trimester is characterized by increased insulin resistance and higher glucose levels, causing a shift in insulin needs. Insulin serves to regulate blood glucose levels by facilitating the transport and storage of glucose into cells, which decreases blood glucose levels after a meal. However, as pregnancy progresses, the placenta produces hormones that can lead to insulin resistance. During the third trimester, the demand for glucose is doubled, which can lead to overproduction of ketone bodies and the risk of ketoacidosis. Consequently, insulin dosages may need to be adjusted to maintain proper blood glucose control and prevent complications.