A&P: Ex.9 - Muscle Tissue

skeletal muscle

attached to bone and provides the means by which the body skeleton moves, as in walking or moving the head

multinucleated

bc each fiber forms from numerous myoblasts, it has many nuclei and is said to be ____

involuntary control

cardiac muscle is under what type of control?

Skeletal Muscle

cells are long, cylindrical, striated, and multinucleate LOCATIONS: combined w/ connective tissue and neural tissues in skeletal muscles FUNCTIONS: Moves or stabilizes the position of the skeleton; guards entrances and exits to the digestive, respiratory, and urinary tracts; generates heat; protects internal organs

Cardiac Muscle Tissue

cells are short, branched, and striated, usually w/ a single nucleus; cells are interconnected by intercalated discs LCATIONS: Heart FUNCTIONS: circulates blood; maintains blood (hydrostatic) pressure

Smooth Muscle

cells are short, spindle-shaped, nonstriated, with a single, central nucleus LOCATIONS: Found in the walls of blood vessels and in digestive, respiratory, urinary, and reproductive organs FUNCTIONS: Moves food, urine, and reproductive tract tract secretions; controls diameter of respiratory passageways; regulates diameter of blood vessels

myoblasts

during development, a number of embryonic cells called ___ fuse into one large cellular structure that is the muscle fiber

cardiac muscle cell

each has a a single nucleus, called a cardiocyte, (the cell is said to be uninucleated) and is branced

uninucleated

each smooth muscle cell is ___ and spindle shaped, thick in the middle and tapered at the ends like a toothpick

cardiac muscles

forms the walls of the heart and pumps blood through the vascular system

smooth (visceral) muscle

found inside hollow organs, such as the stomach, intestines, blood vessels, and uterus; this muscle type controls such functions as the movement of material through the digestive system, the diameter of blood vessels, and uterine contraction during laboe

intercalated discs

how cardiocytes are connected to one another, they are special gap junctions that conduct contraction stimuli from one cardiocyte to the next

nonstriated

lack the bands found in skeletal and cardiac muscle tissue

muscle fibers

long cells that compose the skeletal muscle tissue

tendons

made of dense regular connective tissue proper

striated

muscle fibers are ___ w/ a distinct banded pattern resulting from the repeating organization of inernal contractile proteins called FILAMENTS

sarcolemma

nuclei are clustered under the ____, which is the muscle fiber's cell membrane

voluntary control

skeletal muscle tissue may be consciously stimulated to contract