Lecture 30

Question 1

Are the fiber composition of muscles plastic?

Answer 1

Fiber composition of muscle is variable across individuals and only partly plastic.

Question 2

Describe the difference between type 1 and type 2b muscle fiber

Answer 2

Type 1- Better for endurance (does not generate a lot of power)
Type 2- Specialized for tons of energy burst (fatigues rapidly)

Question 3

What is muscle plasticity in response to chronic changes in behavior?

Answer 3

• Increase in mitochondria volume (more atp can be generated aerobically)
• Increase in lipid droplets (often used to power long distance endurance exercises)
• Increase in number of capillaries surrounding muscle fibers after endurance training
• left ventricle of the heart becomes stronger (increase in stroke volume)

Question 4

What are the two enzymes that increase due to endurance training?

Answer 4

• TCA cycle enzymes
• ETC enzymes (electron transport chain)

Question 5

What is the best treatment for someone with type two diabetes and why?

Answer 5

• exercising because it improves metabolic performance.
• increase in GLUT4 in plasma membranes which helps take up more glucose, so resting blood glucose decreases.

Question 6

What is an example of a physiological regulatory event that caused muscle plasticity?

Answer 6

The muscular dogs have mutations (lack a gene that prevents synthesis of myostatin)