A Typical Ruby-Throated Hummingbird Is 8 Centimeters Long

question 62

Multiple Choice

A typical ruby-throated hummingbird is 8 centimeters long. Express its length in millimeters and dekameters.

• A) 80 mm; 0.8 dam
• B) 80 mm; 0.008 dam
• C) 800 mm; 0.008 dam
• D) 800 mm; 0.8 dam
• E) 0.8 mm; 80 dam

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Definitions:

Action Potentials

Electrical impulses that travel along the membrane of a neuron or muscle cell, enabling the transmission of signals within and between cells.

Sarcomere

The basic functional unit of striated muscle fibers, responsible for muscle contraction, delineated by Z lines.

Myosin Myofilaments

Myosin myofilaments are thick filaments found in muscle cells that, along with actin filaments, play a key role in the muscle contraction process by sliding past each other.

Z Disc

A specialized region within a muscle fiber's sarcomere that serves as the attachment point for actin filaments, marking the boundary between adjacent sarcomere units.