Muscular System Review Questions

Which of these statements is true of smooth muscle?

 Smooth muscle twitches are shorter than those in skeletal muscle

If you took a sample from the I band in skeletal muscle, which of these proteins would you expect to find? (Check ALL correct answers)

Nebulin, Troponin, Actin

What does the A band represent?

The length of a thick filament

What do the calcium ATPases on the sarcoplasmic reticulum do?

 Move calcium from the sarcoplasm into the sarcoplasmic reticulum

Which of these proteins is found in the membrane of the t-tubule? 

 DHP receptor

What is the first thing that happens when ATP binds to the myosin head? 

 The myosin head releases actin

How many ATP are hydrolyzed by a single myosin protein in one contractile cycle?

one

Which of these is closest to the duration of a twitch in a type I skeletal muscle fiber?

100 ms

Which of these steps in aerobic glucose metabolism does NOT produce carbon dioxide as a waste product? (Note: gklycolysis is a partn of both aerobic and anaerobic glucose metabolism)

Glycolysis

During which part of anaerobic glucose metabolism is ATP produced? (Note: glycolysis is a part of both aerobic and anaerobic glucose metabolism)

Glycolosis

Approximately how many ATP could be produced from complete beta-oxidation and metabolism of a 14-carbon fatty acid?

92

Which of these enzymes is most involved in starting smooth muscle contraction?

 Myosin light-chain kinase