Concept #1: Organization within a Single Muscle
Concept #2: Anatomy of a Sarcomere
Concept #3: Muscles and Joints
Some Mnemonics for Sarcomere Structure:
M-Line= Middle of Sarcomere.
Z-Disk= BoundarieZ of sarcomere.
H-Band: H is a THICK letter-- THICK filaments (myosin) only.
I-Band: I is a thin letter-- thin filaments (actin) only.
A-Band: Actin AND myosin (the overlap + what's in between the overlap).
Practice: Fill in the blanks:
A _________________________ is a collection of muscle fibers.
A _________________________ is a collection of myofibrils.
Practice: Which of the following bands in a myofibril include myosin (the thick filament)? (Choose all that apply.)
Practice: Which of the following bands in a myofibril include actin (the thin filament)? (Choose all that apply.)
Practice: The quadriceps are knee extensors; the hamstrings are knee flexors. Which of the following describes the relationship between the quadriceps and hamstring muscle groups?