Question

QUESTION 5

1. The slowest contracting and most fatigue resistant skeletal muscle fibers have these characteristics:

   		a. glycolytic metabolism, large diameter, low blood capillary density, little myoglobin
   		b. aerobic metabolism, small diameter, high blood capillary density, lots of myoglobin
   		c. glycolytic metabolism, small diameter, high blood capillary density, lots of myoglobin
   		d. aerobic metabolism, large diameter, low blood capillary density, little myoglobin

Answer 1

Option C. Glycolytic metabolism, small diameter, high blood capillary density, lots of myoglobin.

Slow twitching muscles have small diameter compared to fast twitching fibres. As they are resistant to fatigue they use anaerobic glycolytic pathway. They have more mitochondria for more energy production. They have more myoglobin for storing more oxygen. They have high blood capillary density to supply more blood as they are made to work for longer time without fatigue.