A smooth, sustained contraction resulting from very rapid stimulation of the muscle, in which no evidence of relaxation is seen, is calleda. a twitch,b. temporal summation,c. multiple motor unit summation,d. fused tetanus.

A motor neuron along with all the muscle fibers it supplies is called a(n) __________.

Properly controlled skeletal muscle contractions produced by changing the frequency of stimulation and the strength of stimulation are referred to as __________.

The sites where the motor nerve impulse is transmitted from the nerve endings to the skeletal muscle cell membranes are thea. neuromuscular junctions,b. sarcomeres,c. myofilaments,d. Z discs.

Contraction elicited by a single brief stimulus is calleda. a twitch,b. temporal summation,c. multiple motor unit summation,d. fused tetanus.

During muscle contraction, ATP is provided bya. a coupled reaction of creatine phosphate with ADP,b. aerobic respiration of glucose, andc. anaerobic glycolysis.______ (1) Which provides ATP fastest?______(2) Which does (do) not require that oxygen be available?______(3) Which provides the highest yield of ATP per glucose molecule?______(4) Which results in the formation of lactic acid?______(5) Which has carbon dioxide and water products?______(6) Which is most important in endurance sports?

The neurotransmitter released by somatic motor neurons isa. acetylcholine,b. acetylcholinesterase,c. norepinephrine.

The ions that enter the skeletal muscle cell during the generation of an action potential area. calcium ions,b. chloride ions,c. sodium ions,d. potassium ions.

Myoglobin has a special function in muscle tissue. Ita. breaks down glycogen,b. is a contractile protein,c. holds a reserve supply of oxygen in the muscle.