When Determining Vertical Angulation,if the Position-Indicating Device (PID)is Positioned Above

question 18

Multiple Choice

When determining vertical angulation,if the position-indicating device (PID) is positioned above the occlusal plane and the central ray is directed _______,the vertical angulation is termed _________.

• A)upward;positive
• B)downward;positive
• C)upward;negative
• D)downward;negative

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Definitions:

Sarcoplasmic Reticulum

A specialized type of endoplasmic reticulum in muscle cells that stores and releases calcium ions.

T Tubules

Tubular extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the transmission of electrical signals.

Sarcolemma

The fine transparent tubular sheath that envelops the fibers of skeletal muscles.

Sarcoplasmic Reticulum

A network of tubules within muscle cells that stores and releases calcium ions, playing a key role in muscle contraction.