Question

Which attributes are found in a Slow-Oxidative (Type I) skeletal muscle cell?

Slow myosin ATP-ase activity
Lots of myoglobin
Easily and quickly fatigued
Very pale color (white meat)
High fatigue resistance
Fast cross-bridge cycling
a) 1, 2, 5
b) 2, 4, 6
c) 1, 3, 4
d) 2, 5, 6

Answer 1

Slow-Oxidative (Type I) skeletal muscle cells exhibit slow myosin ATP-ase activity, contain a lot of myoglobin, and have a high resistance to fatigue. Therefore, the correct attributes are 1, 2, and 5.

Step-by-step explanation:

The attributes found in a Slow-Oxidative (Type I) skeletal muscle cell include slow myosin ATPase activity, a high amount of myoglobin, and high fatigue resistance. Type I fibers are characterized by a dense network of capillaries, a large number of mitochondria, and the ability to sustain aerobic activities for extended periods. This makes them less likely to fatigue quickly and contributes to their darker color due to the presence of myoglobin. The correct answer to which attributes are found in Type I muscle fibers is:

• Slow myosin ATP-ase activity
• Lots of myoglobin
• High fatigue resistance

Thus, the options provided, the correct one is (a) 1, 2, 5.