A#129: A&P - Muscular Systems Quizizz quizs

Skeletal Muscle

• Usually attached to bones

• Involuntary muscle found in the heart

• Smooth muscle found in the digestive tract

• Primarily responsible for reflex actions

Smooth Muscle

• Usually not under voluntary control

• Striated and multi-nucleated

• Found only in the heart

• Under voluntary control

Myosin

• A protein found in thick filaments

• A type of muscle fiber

• A component of the cytoskeleton

• A neurotransmitter

Cardiac Muscle

• Found in the heart

• Found in the lungs

• Found in the skeletal system

• Found in the digestive system

How Muscles and Bones Interact

• Skeletal muscles generate force and produce movement by contracting, or pulling on body parts.

• Bones are responsible for generating force and producing movement.

• Muscles and bones do not interact in the human body.

• Skeletal muscles only support the body without producing movement.

Myofibrils (Muscle Fibers)

• Smaller structures within skeletal muscles.

• Larger structures that store energy in muscles.

• Components that produce muscle fatigue.

• Cells responsible for muscle contraction.

Muscle Contraction

• When the thin filaments in the muscle fiber slide over the thick filaments.

• When the muscle fibers relax and lengthen.

• When the muscle fibers are at rest and not contracting.

• When the thick filaments slide over the thin filaments.

Actin

• A protein found in thin filaments

• A type of carbohydrate

• A lipid molecule

• A nucleic acid component

Sarcomeres

• Basic unit of a muscle

• Type of muscle fiber

• A type of connective tissue

• A muscle contraction mechanism

The total amount of force that a muscle can exert

• depends on the total number of individual muscle fibers that have been stimulated.

• is determined by the length of the muscle at rest.

• is influenced by the type of muscle fibers present.

• is solely based on the muscle's cross-sectional area.