Muscle sys Notes (from gwen)

What are the characteristics of Skeletal Muscle?

Striated, voluntary, long cylindrical fibers, multiple nuclei, and responsible for body movement, posture, and heat production.

Where is Cardiac Muscle located, and what are its main features?

Located in the heart walls, it is striated, involuntary, has branched fibers, a single central nucleus, and pumps blood through the heart.

What is the primary function of Smooth Muscle?

Moves substances through hollow organs (e.g., food in intestines). It is non-striated and involuntary.

What surrounds a muscle and is made of dense irregular connective tissue?

Epimysium.

What is a fascicle, and what surrounds it?

A group of muscle fibers surrounded by perimysium.

Explain the Sliding Filament Theory in muscle contraction.

Myosin heads attach to actin, pull it toward the center of the sarcomere, requiring ATP for detachment, resulting in muscle shortening and force production.

What distinguishes Slow Oxidative muscle fibers from Fast Glycolytic muscle fibers?

Slow Oxidative fibers contract slowly and are fatigue-resistant, while Fast Glycolytic fibers contract very quickly and fatigue rapidly.

Name the muscle that is responsible for the main action in a movement.

Agonist (or Prime mover).

What is the role of a Fixator muscle?

Holds a body part steady to allow other muscles to work smoothly.

Which fibers favor strength and force production in muscles?

Pennate fibers.

What connects muscle fibers to bones and facilitates movement?

Tendons.

What is the main function of the motor neuron at the Neuromuscular Junction?

It sends the electrical signal (via acetylcholine) to muscle fibers to initiate contraction.

Identify the four criteria for muscle naming.

Size, Location, Action, Shape.

What type of muscle is primarily involved in maintaining posture?

Slow Oxidative (Type I) fibers.

How do Parallel fibers differ from Pennate fibers in terms of movement?

Parallel fibers favor mobility and range of motion, while Pennate fibers favor strength and force production.

What are Intercalated discs?

Connections between cardiac muscle cells for electrical signals.

What is the tension produced in a muscle called?

Muscle action or muscle force.

What are the characteristics of Skeletal Muscle?

Striated, voluntary, long cylindrical fibers, multiple nuclei, and responsible for body movement, posture, and heat production.

Where is Cardiac Muscle located, and what are its main features?

Located in the heart walls, it is striated, involuntary, has branched fibers, a single central nucleus, and pumps blood through the heart.

What is the primary function of Smooth Muscle?

Moves substances through hollow organs (e.g., food in intestines). It is non-striated and involuntary.

What surrounds a muscle and is made of dense irregular connective tissue?

Epimysium.

What is a fascicle, and what surrounds it?

A group of muscle fibers surrounded by perimysium.

Explain the Sliding Filament Theory in muscle contraction.

Myosin heads attach to actin, pull it toward the center of the sarcomere, requiring ATP for detachment, resulting in muscle shortening and force production.

What distinguishes Slow Oxidative muscle fibers from Fast Glycolytic muscle fibers?

Slow Oxidative fibers contract slowly and are fatigue-resistant, while Fast Glycolytic fibers contract very quickly and fatigue rapidly.

Name the muscle that is responsible for the main action in a movement.

Agonist (or Prime mover).

What is the role of a Fixator muscle?

Holds a body part steady to allow other muscles to work smoothly.

Which fibers favor strength and force production in muscles?

Pennate fibers.

What connects muscle fibers to bones and facilitates movement?

Tendons.

What is the main function of the motor neuron at the Neuromuscular Junction?

It sends the electrical signal (via acetylcholine) to muscle fibers to initiate contraction.

Identify the four criteria for muscle naming.

Size, Location, Action, Shape.

What type of muscle is primarily involved in maintaining posture?

Slow Oxidative (Type I) fibers.

What are the characteristics of Skeletal Muscle?

Striated, voluntary, long cylindrical fibers, multiple nuclei, and responsible for body movement, posture, and heat production.

Where is Cardiac Muscle located, and what are its main features?

Located in the heart walls, it is striated, involuntary, has branched fibers, a single central nucleus, and pumps blood through the heart.

What is the primary function of Smooth Muscle?

Moves substances through hollow organs (e.g., food in intestines). It is non-striated and involuntary.

What surrounds a muscle and is made of dense irregular connective tissue?

Epimysium.

What is a fascicle, and what surrounds it?

A group of muscle fibers surrounded by perimysium.

Explain the Sliding Filament Theory in muscle contraction.

Myosin heads attach to actin, pull it toward the center of the sarcomere, requiring ATP for detachment, resulting in muscle shortening and force production.

What distinguishes Slow Oxidative muscle fibers from Fast Glycolytic muscle fibers?

Slow Oxidative fibers contract slowly and are fatigue-resistant, while Fast Glycolytic fibers contract very quickly and fatigue rapidly.

Name the muscle that is responsible for the main action in a movement.

Agonist (or Prime mover).

What is the role of a Fixator muscle?

Holds a body part steady to allow other muscles to work smoothly.

Which fibers favor strength and force production in muscles?

Pennate fibers.

What connects muscle fibers to bones and facilitates movement?

Tendons.

What is the main function of the motor neuron at the Neuromuscular Junction?

It sends the electrical signal (via acetylcholine) to muscle fibers to initiate contraction.

Identify the four criteria for muscle naming.

Size, Location, Action, Shape.

What type of muscle is primarily involved in maintaining posture?

Slow Oxidative (Type I) fibers.

How do Parallel fibers differ from Pennate fibers in terms of movement?

Parallel fibers favor mobility and range of motion, while Pennate fibers favor strength and force production.

What are Intercalated discs?

Connections between cardiac muscle cells for electrical signals.

What is the tension produced in a muscle called?

Muscle action or muscle force.