PSY210H5 Chapter Notes - Chapter 4: Prenatal Development, Fetus, Nocturnal Emission
Document Summary
Describing growth growth is extraordinarily rapid during the first year, when the average baby grows about 25cm and gains 7kg. Growth is fairly steady through the preschool and elementary-school years (about 7. 5cm and 3kg-4kg each year) During this growth spurt, teenagers typically grow 10cm and gain 7kg to 8kg each year. After this spurt, which begins 1 to 2 years earlier in girls, growth again slows as children reach adulthood. Growth follows two distinct trends: cephalocaudal, lite(cid:396)all(cid:455) (cid:862)head to tail,(cid:863) a(cid:374)d proximodistal, meaning from close in to farther out. In other words, development proceeds in two main directions. As growth of the hips, legs, and feet catches up later in childhood, bodies take on proportions more adult-like. Other important features of physical growth take place inside the body, with the development of muscle, fat, and bones. Vi(cid:396)tuall(cid:455) all of the (cid:271)od(cid:455)"s (cid:373)us(cid:272)le fi(cid:271)(cid:396)es a(cid:396)e p(cid:396)ese(cid:374)t at (cid:271)i(cid:396)th. Du(cid:396)i(cid:374)g (cid:272)hildhood, (cid:373)us(cid:272)les (cid:271)e(cid:272)o(cid:373)e lo(cid:374)ge(cid:396) a(cid:374)d thi(cid:272)ke(cid:396) as individual fibres fuse together.
