5 Written questions
5 Matching questions
- The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur?
A) Binding causes chemically gated potassium channels to open in the motor end plate.
B) Binding causes voltage-gated sodium channels to open in the motor end plate.
C) Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate.
D) Binding causes potassium voltage-gated channels to open in the motor end plate.
- What is the name given to the regularly spaced infoldings of the sarcolemma?
- Myasthenia gravis is sontimes treated medically by a treatment that involves
- Which of the following is the smallest structural unit in which the distinctive striated bands characteristic of skeletal muscle are observed?
- The smallest contractile unit of a muscle fiber is ________.
A) the elastic filament
B) the myofilament
C) the sarcomere
- a Transverse or t tubules
- b myofibrils
- c inhibiting the action of acetylcholinesterase
- d C
- e C) the sarcomere
5 Multiple choice questions
- C) a series of proteins that control calcium release
- C) load placed on the muscle
- no muscle tension could be generated
5 True/False questions
Skeletal muscle cells contain myoglobin → a state of sustained partial contraction
What energizes the power stroke? → hydrolysis of ATP
Excitation- contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process.
A) Excitation refers to the shape change that occurs in voltage-sensitive proteins in the sarcolemma.
B) Excitation refers to the propagation of action potentials along the axon of a motor neuron.
C) Excitation refers to the release of calcium ions from the sarcoplasmic reticulum.
D) Excitation refers to propagation of action potentials along the sarcolemma. → True
Which of the following is CORRECTLY paired?
A) smooth muscle: striated
B) cardiac muscle: nonstriated
C) cardiac muscle: voluntary control
D) skeletal muscle: voluntary control → D) skeletal muscle: voluntary control
What is the role of tropomyosin in skeletal muscles?
A) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules.
B) Tropomyosin is the chemical that activates the myosin heads.
C) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
D)Tropomyosin is the receptor for the motor neuron neurotransmitter. → C