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After the adolescent growth spurt, sex differences in muscle mass result more from differences in arm musculature than leg musculature.

Because the brain attains 80% of its adult size in the first few postnatal years, it is particularly susceptible to extrinsic factors such as poor nutrition or a physical blow during this time.

Extrinsic (external) factors are those influences that have only a negative effect on growth and development.

The developmental transition for trunk action in sidearm striking is (1) block rotation followed by (2) differentiated rotation.

The conduction speed of nerve impulses is aided by the development of ____________ cells that wrap themselves around the axons.

Infants demonstrate some level of visual-auditory integration early in the first year of life.

There is a trend of improved performance on balance tasks throughout childhood and adolescence, and the pattern of improvement is the same for all types of balance tasks.

Which of the following is characteristic of proficient catching? Select all that apply.

The contemporary view is that the perceptual, cognitive, and action developmental systems are independent of one another.

Growth in the fetal stage is by hyperplasia (an increase in the absolute number of cells) and by ____________ (an increase in the relative size of an individual cell).