Transverse tubules select one: a. store sodium ions for the action potential at the cell surface. b. transmit muscle impulses into the cell interior. c. store calcium ions. d. connect actin and myosin.

b. transmit muscle impulses into the cell interior.

Explanation:

Transverse Tubules are also known as T Tubes that pass laterally through the muscle fiber. The T Tubes or Transverse Tubules carry the nerve impulses received by the sarcolema to the myofibrils, these are also conductive to substances such as glucose, oxygen and ions. In other words, these tubules are responsible for transmitting muscle impulses into the cell interior.  

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.