West Coast EMT Block One Exam

What characterizes the Moro reflex in infants?

1. Opening arms wide and grasping motion after a startle

2. Heart rate decrease due to hypoxia

3. Big toe lifts upward when foot is stroked

4. Turning head toward a touch on the cheek

The correct answer is: Opening arms wide and grasping motion after a startle

The Moro reflex, also known as the startle reflex, is accurately characterized by the opening of the arms wide and a grasping motion after an infant experiences a sudden stimulus, such as a loud noise or a fall. This reflex is a natural response that occurs in infants, typically from birth until about six months of age. When startled, infants will arch their back, spread their arms apart, and then quickly bring their arms back together as if they are trying to grasp something. This reaction is not just a random response; it serves a protective purpose by indicating the need for bonding with caregivers and prompting them to secure the infant in a safe embrace. The other options describe different reflexes or responses not associated with the Moro reflex. The heart rate decrease due to hypoxia pertains to the body’s response to low oxygen levels rather than reflex reactions in infants. The upward movement of the big toe when the foot is stroked is related to the Babinski reflex, which is another distinct reflex observed in infants. Lastly, turning the head toward a touch on the cheek represents the rooting reflex, which aids in breastfeeding by helping infants find the breast or a bottle. Each of these reflexes serves specific developmental functions and occurs under different circumstances, but they should not