Question: ALS (amyotrophic lateral sclerosis) is a disease that destroys nerve cells that control skeletal muscle activity. Without neural stimulation, skeletal muscles eventually waste away and mobility is impossible. In other words, skeletal muscles __________.

Answer: Become atrophied

Question: Which of these characteristics applies only to cardiac muscle tissue?

Answer: Intercalated discs

Question: Which of these increases as muscles age?

Answer: Amount of connective tissue in a muscle

Question: What can older individuals do to increase muscle strength?

Answer: Regularly use hand weights and practice leg lifts

Question: What mineral is released within muscle cells to trigger contraction?

Answer: Calcium

Question: What term refers to a smooth, sustained contraction?

Answer: Complete tetanus

Question: Which of these muscles is located in the neck?

Answer: Sternocleidomastoid

Question: Which of these muscles extends the knee?

Answer: Rectus femoris

Question: Which connective tissue bundles muscle fibers into fascicles?

Answer: Perimysium

Question: Which of these muscles is named for the arrangement of its fascicles?

Answer: External oblique