The PNS consists of nerves and ________.

At rest, skeletal muscle fibers have a resting membrane potential of approximately ________ mV.

Thick filaments are composed of ________ protein.

Oxygen debt is the additional oxygen needed after exercise to restore ________ conditions.

The major means to supply ATP to muscle include ATP stores, phosphate transfer, glycolysis, and aerobic ________.

Excitation-contraction coupling includes release of ________ from the sarcoplasmic reticulum.

Thin filaments are composed of actin, tropomyosin, and ________.

Individual skeletal muscle cells are long, cylindrical, multinucleated cells called skeletal muscle ________.

Skeletal muscle exhibits excitability, conductivity, contractility, extensibility, and ________.

What will the following PHP code output? $val = “5 cats”; echo $val + 3; A) 8 catsB) 53C) 5D) 8 ​