Muscle Basics and Characterizations

<p>Conscious control for specific movements (A)</p> Signup and view all the answers

<p>Fusiform (spindle-like) (D)</p> Signup and view all the answers

<p>In blood vessels and the digestive system (B)</p> Signup and view all the answers

<p>Smooth muscle (D)</p> Signup and view all the answers

<p>The presence of light and dark bands (B)</p> Signup and view all the answers

<p>Skeletal muscle (D)</p> Signup and view all the answers

<p>Long, striated fibers with centrally located nuclei and intercalated discs. (B)</p> Signup and view all the answers

<p>Skeletal muscle (A)</p> Signup and view all the answers

<p>Surrounds a bundle of muscle fibres (fascicles) (D)</p> Signup and view all the answers

<p>Storing calcium ions (D)</p> Signup and view all the answers

<p>The sliding of actin and myosin filaments over each other (A)</p> Signup and view all the answers

<p>Temporalis (C)</p> Signup and view all the answers

<p>Closing the eye (A)</p> Signup and view all the answers

<p>Sterocleidomastoid (A)</p> Signup and view all the answers

<p>Inspiration (inhalation) (A)</p> Signup and view all the answers

<p>Erector spinae (A)</p> Signup and view all the answers

<p>Flexes the spine and compresses the abdominal wall (D)</p> Signup and view all the answers

<p>Lifting the eyebrows/wrinkling the forehead (B)</p> Signup and view all the answers

<p>Drawing the angle of the mouth superiorly and posteriorly, causing one to smile (D)</p> Signup and view all the answers

<p>Contractile units of muscle cell organized into sarcomeres (C)</p> Signup and view all the answers

<p>Lateral flexion and rotation of the spine (D)</p> Signup and view all the answers

<p>Electrical signals from nerves or stimulation from hormones (C)</p> Signup and view all the answers

Skeletal muscles are responsible for movement of the body and are attached to bones via tendons.

Cardiac muscles are found only in the heart and are responsible for the rhythmic pumping of blood. They are controlled by the nervous system and hormones.

Smooth muscles are found in the walls of internal organs like blood vessels and the digestive system. They are controlled by the nervous system or hormones and can be either inactive or rhythmically active.

The characteristic of muscle tissue based on its internal structure, such as striations or lack of striations.

Striated muscles have a banded or striped appearance due to the arrangement of protein filaments within the muscle fibers.

Striated muscles have multiple nuclei located at the periphery of the muscle fiber. This is characteristic of skeletal muscle.

Smooth muscles are characterized by having a single nucleus located centrally within each muscle fiber.

Muscles that can be consciously controlled to perform a specific function.

Muscle function refers to how a muscle interacts with the body to produce movement.

Intercalated discs are specialized junctions that connect heart muscle cells together, allowing for coordinated contraction.

The ability of a muscle tissue to receive and respond to signals from nerves or hormones.

The ability of a muscle cell to shorten when excited.

Muscles that move the skeleton, controlled voluntarily.

Muscle tissue that is not consciously controlled.

The cell membrane surrounding a muscle cell.

Structural units of the muscle cell that contain contractile myofilaments.

Contractile units of the muscle cell, organized into repeating units called sarcomeres.

Repeating structural units of myofilaments that shorten during muscle contraction.

Surrounds each myofibril and stores calcium within the muscle cell.

Extensions of the sarcolemma that transmit nerve stimulation to the SR.

The process where actin and myosin filaments slide over each other, shortening the sarcomere and increasing muscle tension.

A group of muscles responsible for facial expressions.

Muscle that covers the frontal bone and lifts the eyebrows.

Muscle surrounding the eye that closes it forcefully.

Muscle surrounding the mouth that enables puckering of lips.