AP BIOLOGY

Detailed explanation-1: -Humans have another vestigial behavior: the “grasping reflex” (also called the “palmar reflex”). Young infants can hold onto objects with both their hands and their feet-and hold tightly and tenaciously.

Detailed explanation-2: -The palmar grasp reflex allows a newborn to clench an object when pressure and touch are applied to the palm; however, this is not volitional in nature. The first readily recognizable fine motor skill that is crucial to normal development is unfisting.

Detailed explanation-3: -The Moro reflex is a normal reflex for an infant when he or she is startled or feels like they are falling. The infant will have a startled look and the arms will fling out sideways with the palms up and the thumbs flexed. Absence of the Moro reflex in newborn infants is abnormal and may indicate an injury or disease.

Detailed explanation-4: -The palmar grasp reflex-which allows your baby to close her fingers around an object placed in her palm-is one of several newborn reflexes that appear at birth. It’s the reason why, when you put your finger or a small toy into her hand, she’ll make a fist around it and hold on tightly.