Problem 3 Males and females are quite simi... [FREE SOLUTION]

Chapter 13: Problem 3

Males and females are quite similar in height when they begin the adolescent growth spurt. Why are females about 10 centimeters shorter than males by adulthood?

Short Answer

Expert verified

Females end their growth spurt earlier, and differences in hormonal effects contribute to males being taller.

Step by step solution

Understand Adolescent Growth Spurts

During adolescence, both males and females experience growth spurts, which are periods of rapid growth in height and other physical developments. This typically occurs earlier in females than in males.

Identify Gender Differences in Growth Timing

Females usually begin their growth spurt around 10-12 years of age, while for males, it typically starts later, around 12-14 years of age. As a result, females reach their maximum growth potential earlier than males.

Analyze the Duration of Growth

Males generally continue to grow for a longer period during adolescence. Typically, females stop growing around 16-17 years, while males often continue to grow until about 18-21 years, leading to generally increased adult height in males.

Consider the Impact of Hormones

Hormones like estrogen in females can lead to earlier closure of growth plates in bones compared to males, who have testosterone, which allows their growth plates to remain open for a longer period, contributing to their increased final height.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Gender Differences in Growth

During adolescence, the growth spurt is a significant period of rapid growth and development. However, males and females experience this growth spurt at different times and durations, which results in noticeable differences in adult height.

Timing of Growth: Females typically begin their growth spurt around ages 10 to 12, while males start later, between 12 and 14 years old. This means girls often have a head start in growing taller compared to boys of the same age.
Duration of Growth: Although girls may start growing earlier, they also tend to stop growing sooner, often by ages 16 to 17. Boys, on the other hand, continue to grow until they are around 18 to 21 years old, giving them a longer period to increase in height.
Final Height: Because of these differences, males generally end up taller than females by adulthood. This difference in timing and duration is a significant factor in the average height disparity between genders.

Hormonal Impact on Growth

Hormones play a crucial role in the regulation and timing of growth during adolescence. They are responsible for the initiation, pace, and cessation of the growth spurt, affecting how long and how much an adolescent grows.

Role of Estrogen: In females, estrogen is the key hormone that accelerates the growth spurt but also speeds up the closure of growth plates in bones. This means females reach their adult height sooner since the growth plates close earlier.
Testosterone in Males: Males primarily rely on testosterone, which not only stimulates growth in height and muscle mass but also allows their growth plates to remain open longer.
Impact on Growth Duration: Due to these hormonal differences, males have an extended period of growth compared to females, as testosterone aids in keeping the growth plates open, thus contributing to a taller adult stature.

Growth Plate Closure

The closure of growth plates is a critical factor in determining when adolescents stop growing. Growth plates, also known as epiphyseal plates, are areas of cartilage located near the ends of long bones, where bone growth occurs.

How It Works: During childhood and adolescence, growth plates are active and allow for new bone to form. As an adolescent approaches the end of their growth period, these plates "close," turning completely into bone, which halts further lengthening.
Influencing Factors: The timing of growth plate closure is heavily influenced by hormones. Estrogen causes growth plates to close earlier, which is why females stop growing earlier than males.
Significance of Closure: Once growth plates have closed, no further increase in height is possible. This process is natural and varies from individual to individual, but generally, it ensures the stability of bone structure in adulthood.

91影视

Males and females are quite similar in height when they begin the adolescent growth spurt. Why are females about 10 centimeters shorter than males by adulthood?

Short Answer

Step by step solution

Understand Adolescent Growth Spurts

Identify Gender Differences in Growth Timing

Analyze the Duration of Growth

Consider the Impact of Hormones

Key Concepts

Gender Differences in Growth

Hormonal Impact on Growth

Growth Plate Closure

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Biology Textbooks

Ecology

Plant Biology

Biological Molecules

Ecosystems

Substance Exchange

Astrobiological Science

Study anywhere. Anytime. Across all devices.