Good morning! Please have a sharpened pencil and your biology book, and be silently at your seat by the time the bell rings! Be prepared to take the quiz over the first twenty Greek/Latin terms within 5 minutes after the bell.
Muscular system
Functions Movement
Types of muscle tissue Skeletal muscle Smooth muscle Cardiac muscle
Skeletal muscles Most consciously controlled by nervous system Attached to bones Cells are large, have many nuclei, vary in length from 1 mm to 30 cm, striated
Smooth muscles Usually not under conscious control Spindle-shaped, 1 nucleus, not striated Walls of hollow structures like digestive tract, blood vessels, intestines
Cardiac muscles Found only in heart Striated like skeletal, but cells are smaller May have 1-2 nuclei Similar to smooth b/c nervous system does not voluntarily control
Muscle contraction
Tendons Tough connective tissue Attached to bone to make them work as levers Joint acts as fulcrum
Work it, baby, work it Biceps contracts, elbow bends/flexes Triceps must contract to extend Aerobic – better efficiency, endurance Resistance – muscle size, strength, lower body fat, stronger bones