MCTs Exercise Science 5

Question 1

What is the typical respiratory exchange ratio (RER) when fat is the predominant fuel?

Accepted Answer

About 0.70

Answer

Fat oxidation produces an RER near 0.70, while carbohydrate produces about 1.00.

Question 2

Which term describes the smallest functional unit of muscle contraction?

Accepted Answer

Sarcomere

Answer

The sarcomere, between two Z-lines, is the basic contractile unit.

Question 3

Which ion released from the sarcoplasmic reticulum initiates muscle contraction by binding to troponin?

Accepted Answer

Calcium

Answer

Calcium binds troponin, shifting tropomyosin to expose actin binding sites.

Question 4

According to Henneman's size principle, which motor units are recruited first?

Accepted Answer

Smallest, low-threshold units

Answer

Motor units are recruited from smallest to largest as force demand increases.

Question 5

A periodization model that varies intensity and volume within the same week is called what?

Accepted Answer

Undulating periodization

Answer

Undulating (nonlinear) periodization changes training variables frequently, often daily or weekly.

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