Muscular System Physiology
Jagged lines which border the sarcomere
Z-Line
A muscle strain can be caused by incorrect form when exercising.
T or F
True
Sudden Involuntary muscle contraction
William is a cross country runner. During a long run, he feels a sudden, sharp pain in his side. When he grasps his side, he feels a hard lump under his skin. Which of the following is William mostly likely experiencing?
Cramps
Two proteins that play a crucial role in the muscle contraction.
Actin and myosin
What provides the energy needed for myosin to extend forward?
ATP
Inflammation of the tendon, often caused by chronic damage
Tendinitis
Progression of muscular dystrophy results in death of which of the following?
Muscle Tissue
Lucy experiences eyelid drooping, facial muscle weakness, double vision and problems swallowing. Which of the following diseases does Lucy most likely have?
Myasthenia Gravis
Hunter has been a baseball pitcher for five years. After his last game, he feels a dull ache when he moves his shoulder. There is mild swelling and tenderness there. Which of the following is Hunter mostly likely experiencing?
Tendinitis
The neuromuscular junction refers to which of the following?
Motor Neuron meeting muscle tissue
A hard lump of muscle tissues beneath the skin caused by an overuse of a muscle and dehydration.
Cramp
Torticollis Dystonia is a type of dystonia in the ____ region.
Neck
The following symptoms describes which muscular system disorder.
Eyelid drooping, double vision, weakness of the face, problems swallowing or chewing, weakness of limbs.
Myasthenia Gravis
Which of the following represents the correct muscular organization from largest to smallest?
Fascicles, myocytes, myofibril, myofilaments
Muscle contraction takes place at the ______.
Myofibril
Which of the following is typically the first sign or symptom of dermatomyositis?
Red, scaly rash on elbows, knees, chest and face
Which two muscular system disorders shares many characteristics with autoimmune disorders?
Dermatomyositis; Polymyositis
Oromandibular Dystonia (Meige's Syndrome) affects which area of the body.
What are the 2 primary causes for muscle cramps.
Dehydration; mineral depletion
Muscle contraction is a process where __________.
A. The sarcomere shortens
B. Myosin and troponin bind
C. Troponin and tropomyosin block calcium
D. Actin and myosin are at rest in the sarcomere
A. The sarcomere shortens
Congenital Myopathies typically deals with which population of individuals?
Infants/children
Muscular disorders present at birth.
Tyler is experiencing sustained contraction of his neck muscles. This has led to a change in his neck posture. Which of the following diseases does Tyler most likely have?
Dystonia
List three general symptoms of Muscular Dystrophy
enlarged calf muscles; difficulty rising for lying/sitting position; trouble walking; waddling gait; trouble swallowing; heart problems; learning disabilities; stiff/loose joints; curved spine; breathing problems
Muscle contractions can be milliseconds long, as fast as a ______ _______ or ____ __ __ ____
camera flash; blink of an eye