5.3

Question 1

Muscle tissue

Answer 1

Contractile, conductive, elastic extensible and excitable. When muscle tissue is stimulated to contract, it produces movement, such as the voluntary motion of body parts, contraction of the heart, and propulsion of materials through the digestive and urinary tracts. Muscle tissue is well-vascularized.

Question 2

Three types of muscle tissue

Answer 2

Skeletal muscle, Cardiac muscle, and smooth muscle

Question 3

Skeletal muscle tissue

Answer 3

Primarily responsible for movement of the skeleton (it can also move the skin of the face and composes the external urethral and external anal sphincters). This tissue functions in thermoregulation, as when our skeletal muscle contracts it generates hear. Composed of long cylindrical cells called skeletal muscle fibers. Arranged in parallel bundles that typically run the length of the entire muscle. Each is multi-nucleated. Exhibit striations, which reflect the overlapping pattern of parallel thick and thin contractile protein filaments. VOLUNTARY as it usually doesn’t contract unless stimulated by somatic nervous system. Reduced ability to repair itself through cell division.

Question 4

Cardiac Muscle tissue

Answer 4

Structure: Short, typically branching cells that contain one or two centrally located nuclei: cells contain visible striations; intercalated discs between cells; under involuntary control. Minimal capacity for regeneration.

Question 5

Smooth Muscle tissue

Answer 5

Structure: Short and tapered cells that lack striations; cells contain one centrally located nucleus; under involuntary control. Can engage in cell division to provide growth and healing of the tissue
Function: Moves and propels materials through internal organs; controls the size of the lumen
Location: Walls of hollow internal organs, intestines, stomach, airways, urinary bladder, uterus, blood vessels, iris of the eyes.