MEDICAL PHYSIOLOGY

Detailed explanation-1: -At the beginning of the 11th week of pregnancy, or the ninth week after conception, your baby’s head still makes up about half of its length. However, your baby’s body is about to catch up.

Detailed explanation-2: -The first organ system to develop during organogenesis is the cardiovascular system. The heart has established its four chambers by four weeks of development, whereas week six involves cardiac outflow separation and descent of the heart (and lungs) into the thorax.

Detailed explanation-3: -The spinal cord, brain, heart, and lungs grow and develop rapidly during the first trimester. In addition, the mouth, nose, eyes, ears, toes, and fingers begin to form.