Chapter 5

Question 1

In young adulthood, the proportion of lean body weight often ____________ as a result of _____________ in fat weight.

Answer 1

decreases; increases

Question 2

_______________ refers to the area(s) in in the midportion of the shafts of long bones where bone cells are formed so that the cartilage-model bones of the fetal skeleton begin ossifying, from the center outward, to form bone shafts.

Answer 2

Primary ossification centers

Question 3

Which type of muscle fiber is associated with performance of endurance activities?

Answer 3

type 1

Question 4

In the prenatal period, neurons proliferate at a rate of ________ per minute.

Answer 4

250,000

Question 5

Myelination of axons _______ the speed and frequency of firing of nerve impulses

Answer 5

improves

Question 6

__________________ refers to the area(s) near the ends of long bones where new bone cells are formed and deposited so that the bones grow in length.

Answer 6

b. Secondary ossification centers Incorrect

c. Epiphyseal plates

Question 7

A loss of 1% of bone mass occurs each year, starting as early as the mid-_____________.

Answer 7

20’s

Question 8

There is a rapid increase of _____ in the first 6 months after birth, and the highest peak weight velocity occurs in the first month.

Answer 8

fat

Question 9

Muscle mass increases rapidly in boys up to about age 17 and ultimately accounts for _______% of men’s body weight.

Answer 9

56

Question 10

The ______________ system exerts its control over specific cellular functions through chemical substances called hormones.

Answer 10

endocrine