Unit 3 Final Review - Fall Final

Front

What is the endomysium?

Back

The endomysium is a delicate connective tissue that surrounds each individual muscle fiber, providing support and insulation.

Front

What is a muscle fiber?

Back

A muscle fiber is an individual skeletal muscle cell that is responsible for contraction and is composed of myofibrils.

Front

What is the sarcolemma?

Back

The sarcolemma is the plasma membrane surrounding a muscle fiber, playing a crucial role in muscle contraction by conducting electrical impulses.

Front

What triggers the release of neurotransmitters at the neuromuscular junction?

Back

An action potential reaching the terminal of a motor neuron triggers the release of neurotransmitters into the synaptic cleft.

Front

What is the function of the sarcoplasmic reticulum?

Back

The sarcoplasmic reticulum is a network of channels that regulates calcium ions, essential for muscle contraction.

Front

Define fascicle in the context of muscle anatomy.

Back

A fascicle is a bundle of muscle fibers grouped together, surrounded by perimysium, and is part of the overall structure of a muscle.

Front

What is the role of T-Tubules in muscle contraction?

Back

T-Tubules are extensions of the sarcolemma that penetrate into the muscle fiber, facilitating the rapid transmission of action potentials and ensuring coordinated contraction.

Front

What is an aponeurosis?

Back

An aponeurosis is a flat, sheet-like tendon that connects muscles to the parts they move, providing a strong attachment.

Front

What is the difference between an agonist and antagonist muscle?

Back

An agonist muscle is the primary muscle responsible for a specific movement, while an antagonist muscle opposes that movement.

Front

Explain the term 'action potential'.

Back

An action potential is a rapid change in electrical charge across a cell membrane, leading to the transmission of signals in neurons and muscle cells.