Which Best Describes a "Myofibril

question 42

Multiple Choice

Which best describes a "myofibril"?

• A)It is a single skeletal muscle cell.
• B)It is a cylindrical cellular organelle composed of myofilaments.
• C)It is a hollow membranous structure that stores calcium.
• D)It is composed of a single type of protein and forms cross-bridges.
• E)It is a fibrous junction between a muscle cell and a tendon.

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Definitions:

Cerebral Cortex

The brain's outermost layer responsible for higher-order brain functions such as sensory perception, cognition, and motor control.

Facial Muscle Movements

Contractions and relaxations of muscles in the face, responsible for creating facial expressions.

Frontal

Pertaining to the front part of the brain, involved in decision making, problem solving, and controlling behavior.

Autonomic Nervous System

Part of the peripheral nervous system that controls involuntary body functions, such as heart rate, digestion, and respiratory rate.