Anatomy & Physiology Reproductive #19

Question

Which is a primary sexual characteristic for a male?

Answers

  1. Voice deepening
    • Rationale:

      Voice deepening is a secondary, not primary, sexual characteristic for a male.

  2. Muscle development
    • Rationale:

      Muscle development is a secondary, not primary, sexual characteristic for a male.

  3. Growth of the penis and scrotum
    • Rationale:

      The growth of the penis and scrotum is a primary sexual characteristic for a male. The penis and scrotum are reproductive structures present at birth which is why both are classified as primary sexual characteristics.

  4. Growth of facial, pubic, and underarm hair
    • Rationale:

      The growth of facial and pubic hair is a secondary, not primary, sexual characteristic for the male.

Overview

Primary, and secondary, sexual characteristics are the physical traits that make females and males look and behave differently from one another.

Explanation

Learning Outcomes

Primary sexual characteristics are present at birth while secondary sexual characteristics develop as a result of hormonal shifts that begin at puberty. Since the penis and scrotum are present at birth, but grow during puberty, these are both primary male sexual characteristics. Testosterone is responsible for the growth of male primary and secondary sexual characteristics that begins at puberty.

Test Taking Tip

Consider the differences between the types of sexual characteristics when choosing the correct answer choice for this question.

Video Rationale