What are the structures that are air-filled spaces of the skull bones?

During skeletal muscle contraction, myosin heads attach to active sites of:

Bursae are

_____ is an electrical impulse that signals the muscle to contract

The following steps are involved in what process?: Arrival of an action potential; Release of ACh; ACh binding to ACh receptors; appearance of an action potential that travels across the membrane and transverse tubule; return to initial state

If a bone’s length exceeds its width, it is classified as a ____.

Oxygen debt promotes lactic acid accumulation on muscles from anaerobic cellular respiration.

The outermost layer of the skin is called the ____.

_____ muscles move liquids and food through the body.

Which of the following covers the muscle organ itself?