Final answer:
The pattern where different parts of the body develop at different rates is known as differential growth, evident in embryonic development stages like organogenesis and during adolescent growth spurts. Critical periods are times during fetal development when organs are most susceptible to growth and development changes.
Step-by-step explanation:
The pattern where different parts of the body develop at different rates is known as differential growth. This phenomenon is particularly evident during certain stages of development such as embryonic development and adolescent growth spurts (AGS). For instance, during embryonic development, distinct cell layers emerge and differentiate into specific tissues or organs in a process known as organogenesis. Each part of the body such as limbs, organs, and the nervous system develops at various rates and times.
Embryonic Development and Critical Periods
During the critical period in fetal growth, specific parts or organs are highly sensitive to developmental changes. Events such as organogenesis occur during these critical periods, ensuring the correct development of organs.
Adolescent Growth Spurts
The accelerated rate of growth characterizes the adolescent stage where extremities such as the head, hands, and feet grow first, followed by arms and legs, leading to temporary disproportion until growth evens out.
The diversity of growth patterns demonstrates that while development can be continuous, it can also occur in distinct stages influenced by genetic and environmental factors. This results in both universal and unique development courses across individuals.