Anatomy & Physiology Nervous #19

Question

Which is an example of a primitive reflex?

Answers

  1. Gag
    • Rationale:

      The gag reflex is not a primitive reflex. It is present at birth and remains active for the entire span of an individual’s life.

  2. Moro
    • Rationale:

      The Moro reflex is a startle reflex. The Moro reflex is a primitive reflex as it disappears between three to 6 months of life.

  3. Cough
    • Rationale:

      The cough reflex is not a primitive reflex. It is present at birth and remains active for the entire span of an individual’s life.

  4. Plantar
    • Rationale:

      The plantar reflex is not a primitive reflex. It is present at birth and remains active for the entire span of an individual’s life.

Overview

A reflex is a muscle reaction that occurs automatically in response to stimulation.

Explanation

Learning Outcomes

There are two types of reflexes. One type of reflex is a primitive reflex that is present at birth but disappears within the first months of life. Other reflexes are present at birth and remain active for the entire span of an individual life. The moro reflex is an example of a primitive reflex.

Test Taking Tip

Ask yourself if each answer choice is a reflex that remains throughout life. The reflex that does not stay through an individual’s lifetime is the correct choice for this question.

Video Rationale