Muscle Physiology Quiz

What do the heads of myosin molecules form with actin filaments?

• Cross-bridges

• Double bonds

• Ionic bonds

• Hydrogen bonds

What varies substantially among muscles and individuals regarding muscle fibers?

• The color of the fibers

• The proportions of type I, IIa, and IIx fibers

• The length of the fibers

• The weight of the fibers

What is the role of myosin in muscle fibers?

• Provides energy

• Exists in different molecular forms (isoforms)

• Determines fiber color

• Increases fiber length

Which muscle fiber type has the lowest myoglobin content?

• Type I

• Type IIa

• Type IIx

• All have the same

What happens to ATP during its hydrolysis?

• It forms a double helix

• It releases energy

• It absorbs energy

• It becomes a protein

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What are the products of ATP hydrolysis?

• ADP, H+, and Pi

• ADP, H2O, and Pi

• ADP, Na+, and Pi

• ADP, K+, and Pi

What is the role of anaerobic metabolism in muscle contraction?

• Breakdown of proteins

• Metabolism of glycogen or glucose

• Production of oxygen

• Synthesis of fats

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Which of the following can be used as a fuel for oxidative metabolism but is not a major source during exercise?

• Glucose

• Amino acids

• Fatty acids

• Nucleotides

Which molecule is directly involved in ATP resynthesis?

• ADP

• NADH

• FADH2

• Glucose

Which process occurs at the same rate as ATP breakdown to maintain ATP levels?

• Protein synthesis

• ATP resynthesis

• Fat oxidation

• Glycogen storage