Which Terms Are Correctly Matched to Their Definitions

question 29

Multiple Choice

Which terms are correctly matched to their definitions?
I. Plastic - a long chain molecule synthesized by linking together many single parts.
II. Polymer - can be molded when hot and retains its shape when cooled.
III. Thermoplastic - can be molded when hot and retains its shape when cooled.
IV. Thermosetting plastic - can be molded when first prepared, but hardens irreversibly when
Cooled.

• A) III, IV
• B) II, III
• C) I, II
• D) I, IV

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Definitions:

Extracellular Ca2+

Calcium ions found outside of cells, crucial for various cellular processes including muscle contraction, neurotransmitter release, and blood coagulation.

Cardiac Muscle Contraction

The process by which heart muscle cells contract to pump blood, regulated by electrical impulses and calcium ions.

Sarcoplasmic Reticulum

A network of tubules and sacs found within muscle cells, involved in the regulation of calcium ions to facilitate muscle contraction and relaxation.

Sarcolemma

Plasma membrane of a muscle fiber.