Quick pick: muscle physiology

Exercise and reference answers

Questions

1. Question

   Which protein directly covers the myosin-binding sites on actin?

   Choices

   1. Troponin
   2. Tropomyosin
   3. Titin
   4. Dystrophin

   Correct choice

   Tropomyosin

2. Question

   Which ATP source powers roughly the first 15 seconds of contraction?

   Choices

   1. Aerobic respiration
   2. Anaerobic glycolysis
   3. Creatine phosphate
   4. Beta-oxidation

   Correct choice

   Creatine phosphate

3. Question

   Small motor units, like those of the eye muscles, mainly give a muscle what advantage?

   Choices

   1. Maximum raw force
   2. Total fatigue resistance
   3. Fastest possible conduction
   4. Very fine motor control

   Correct choice

   Very fine motor control

4. Question

   What is the functional contractile unit of a skeletal muscle fiber?

   Choices

   1. Sarcomere
   2. Fascicle
   3. Epimysium
   4. Aponeurosis

   Correct choice

   Sarcomere

5. Question

   Which muscle type uses calmodulin instead of troponin to regulate contraction?

   Choices

   1. Skeletal muscle
   2. Smooth muscle
   3. Cardiac muscle
   4. None of these

   Correct choice

   Smooth muscle

Instructions

Pick the right answer before time runs out.