Written Laser Hair Removal Practice Exam

Lanugo hair is particularly dense in which period of human development?

1. First trimester of pregnancy

2. Second trimester of pregnancy

3. Third trimester of pregnancy

4. Shortly after birth

The correct answer is: Third trimester of pregnancy

Lanugo hair is a type of fine, downy hair that covers a developing fetus during pregnancy. It is usually shed near the end of the third trimester, making the third trimester the period with the highest density of lanugo hair. Option A, the first trimester, is incorrect because lanugo hair typically does not appear until around 5-6 months of gestation. Option B, the second trimester, is also incorrect as lanugo hair becomes less dense during this time as the fetus starts to develop more body fat. Option D, shortly after birth, is also incorrect as lanugo hair is usually shed before or shortly after birth.