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Anatomy & Physiology > Chapter 17 > Flashcards

Chapter 17 Flashcards

1
Q

What are the functional characteristics of skeletal muscle tissues?

A

Excitability
Contractibility
Extensibility

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2
Q

Skeletal Muscle Cells-Feature

A

Cells=fibres (threadlike appearance)
Plasma Membrane= sarcolemma
Cytoplasm=sarcoplasm
Endoplasmic Reticulum=sarcoplasmic reticulum (SR)

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3
Q

What do muscle fibers contain?

A

Many mitochondria, several nuclei, numerous fine fibres packed together (myofibrils), **

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4
Q

There are myofibrils that are in very fine threadlike structures called ________.

A

Myofilaments

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5
Q

How many proteins make up myofilaments?

A

4

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6
Q

What are the 2 main proteins in myofilaments?

A

Myosin (makes up thick myofilaments) and actin (makes up thin myofilaments)

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7
Q

What is a motor neuron?

A

A nerve impulse arrives on this after a skeletal muscle fibre has been stimulated.

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8
Q

What is a neuromuscular junction?

A

A microscopic gap (called a synapse) between the end of a motor neuron and the sarcolemma of the fiber.

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Anatomy & Physiology (17 decks)

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