What Is the Name of the Innermost Shell of an Atom

question 3

Multiple Choice

What is the name of the innermost shell of an atom?

• A) A shell
• B) K shell
• C) Z shell
• D) Nuclear shell

---

Definitions:

Smooth Muscle

A type of muscle found in the walls of internal organs, such as the stomach and blood vessels, that contracts involuntarily.

Calcium-Calmodulin Complex

A complex formed when calcium ions bind to the protein calmodulin, playing a key role in various cellular processes.

Myofibrils

The basic rod-like unit of a muscle cell, composed of sarcomeres, which are responsible for the muscle's contractile properties.

Sarcomeres

The basic contractile units of muscle fiber, defined by the region between two Z lines, responsible for muscle contraction.