Which of the following events occurs first in the overall process of muscle stimulation?
A. Calcium ions bind to troponin.
B. Myosin heads bind to receptor sites on thin myofilaments.
C. Sodium and potassium channels open in the sarcolemma.
D. Calcium ions are released from the sarcoplasmic reticulum.
E. Acetylcholine is released into the synaptic cleft.
Answer: E
You might also like to view...
Which of the following structures articulates with the head of the radius?
A. The capitulum B. The olecranon process C. The coronoid process D. The ulnar notch E. The trochlea
The orbital complex includes part of the sphenoid bone
Indicate whether this statement is true or false.
During the absolute refractory period for a neuron, most voltage-gated Na+-channels are in which conformation?
a. closed but capable of opening b. open, or activated c. closed and not capable of opening d. Any of these. e. None of these.
Each of the receiving chambers of the heart has a wrinkled flaplike extension; the one that is more visible from an anterior view is the
A. left auricle. B. interventricular septum. C. right auricle. D. interatrial septum.