Use the Hertzsprung-Russell Diagram (Figure 10-7)and the Mass-Luminosity Relation (Figure

question 46

Multiple Choice

Use the Hertzsprung-Russell diagram (Figure 10-7) and the mass-luminosity relation (Figure 10-14) in Comins,Discovering the Essential Universe,6th ed.,to estimate the mass of Vega,an AO V main-sequence star with a surface temperature of about 10,000 K.

• A) between 1.5 and 5.0 solar masses
• B) about 10 solar masses
• C) less than 1.0 solar masse
• D) between 5.0 and 10.0 solar masses

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Definitions:

Perimysium

A sheath of connective tissue that groups muscle fibers into bundles or fascicles within a muscle.

Endomysium

A thin layer of connective tissue that surrounds each individual muscle fiber, providing support and maintaining the spatial organization of muscle fibers.

Myofilaments

The filamentous components of muscles, comprising mainly of actin (thin filaments) and myosin (thick filaments), essential for muscle contraction.

Sarcoplasmic Reticulum

A specialized type of smooth endoplasmic reticulum found in muscle fibers, critical in regulating calcium ions and thus muscle contraction.