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Hair Evidence › View

The two main categories of human hair are:

A. Terminal and vellus

B. terminus and vascular

C. terminal and fetal

D. head and body

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Musculoskeletal System Responses to Exercises › View

What is the role of calcium ions in muscle contraction?

A. Initiate muscle relaxation

B. Activate troponin to expose binding sites on actin

C. Generate ATP for cross-bridge formation

D. Stabilize the sarcomere structure

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