An action potential causes calcium ions to diffuse from the into the
a. sarcoplasmic reticulum ; sarcolemma
b. sarcoplasmic reticulum ; sarcoplasm
c. sarcoplasm ; sarcoplasmic reticulum
d. sarcoplasm ; sarcolemma
e. sarcolemma ; sarcoplasm

B. sarcoplasmic reticulum ; sarcoplasm

Explanation:

A neural signal is the electrical trigger for calcium release from sarcoplasmic reticulum into the sarcoplasm. Electrical signals, called action potentials, travel along the neuron's axon connecting to individual muscle fibers at a neuromuscular junction. Neuron action potentials cause the release of neurotransmitters from the synaptic terminal into the synaptic cleft, where they can diffuse across the synaptic cleft and bind to a receptor molecule on the motor end plate.

answer; ///i do believe the answer is (virus);

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.