1. 1QQ # 23 for 8:30 am Fewer mitochondria than Type IIB myofibers.
1. What are the characteristics of Type I myofibers?
Fewer mitochondria than Type IIB myofibers.
Fewer capillaries than Type IIb myofibers.
Smaller cross sectional diameter than Type IIB myofibers.
Larger stores of glycogen than Type IIB myofibers.
Have a slower isozyme of myosin ATPase than Type II myofibers.
2. After one has be moderately exercising for an hour, which of the following is the primary source of fuel for skeletal myofibers?
Amino acids
Glycogen
Creatine phosphate
Plasma glucose
Fatty acids from the plasma

2. 1QQ # 23 for 9:30 am
1. Compared to non-postural muscles, postural muscles have more
a) type IIB myofibers
b) Myoglobin
c) Mitochondria
d) Glycogen
Glycolytic enzymes
2. Explain how the largest motor units are last to be recruited and which type of myofiber comprises the largest motor units and why?