5 Written questions
5 Matching questions
- Eccentric contractions are more forceful than concentric contractions.
- Excitation-contraction coupling includes all EXCEPT which of the following events?
A) release of acetylcholine from axon terminals at the neuromuscular junction
B) binding of calcium ions to troponin, which removes the blocking action of tropomyosin
C) release of calcium ions from the terminal cisterns
D) propagation of an action potential along the sarcolemma and down T tubules
- What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated?
A) motor neurons always innervated thousands of skeletal muscle fibers
B) a motor neuron typically innervates only one skeletal muscle fiber
C) hundreds of skeletal muscle fibers are innervated by a single motor neuron
D) A skeletal muscle fiber is innervated by multiple motor neurons
- Which muscle cells have the greatest ability to regenerate?
- Muscle contraction will always promote movement of body parts regardless of how they are attached.
- a C
- b smooth
- c False
- d A
- e True
5 Multiple choice questions
- thick myofilaments
5 True/False questions
Myasthenia gravis is sontimes treated medically by a treatment that involves → sarcomere
What is the role of calcium ions in muscle contraction?
A) reestablish glycogen stores
B) increase levels of myoglobin
C) form hydroxyapatite crystals
D) bind to regulatory sites on troponin to remove contraction inhibition → D
Which of the choices below does not describe how excess postexercise oxygen consumption (oxygen deficit) restores metabolic conditions?
A) converts lactic acid back into glycogen stores in the liver
B) resynthesizes creatine phosphate and ATP in muscle fibers
C) replaces the oxygen removed from myoglobin
D) increases the level of lactic acid in the muscle → sarcomere
The smallest contractile unit of a muscle fiber is ________.
A) the elastic filament
B) the myofilament
C) the sarcomere
D) troponin → C
Which pathway for regenerating ATP provides the majority of the energy used for muscle activity during 30 minutes of light to moderate exercise?
A) direct phosphorylation of ADP by creatine phosphate
B) anaerobic glycolysis
C) use of stored ATP
D)aerobic respiration → D) aerobic respiration