A muscle that opposes, or reverses, a particular movement is a(n) ________. A) antagonistB) fixatorC) synergistD) agonist   

What is the major factor controlling how levers work? A) the structural characteristics of the muscles of the person using the leverB) the weight of the loadC) the direction the load is being movedD) the difference in the positioning of the effort, load, and fulcrum  

During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________. A) a strong baseB) stearic acidC) hydrochloric acidD) lactic acid  

Which muscle inserts onto the olecranon process? a. Biceps brachiib. Triceps brachiic. Latissimus dorsid. Pectoralis major

What is a muscle that provides the major force for producing a specific movement called? A) a synergistB) an agonistC) an antagonistD) a fixator  

The contractile units of skeletal muscles are ________. A) microtubulesB) mitochondriaC) T tubulesD) myofibrils  

The muscles of the back, which are most susceptible to injury during heavy lifting, belong to the __________ muscle group. a. quadratus lumborumb. erector spinaec. semispinalisd. splenius  

What is calcium’s function during muscle contraction? a. Calcium binds to troponin, changing its shape and removing the blocking action of tropomyosin.b. Calcium binds to troponin to prevent myosin from attaching to actin.c. Calcium depolarizes the muscle fiber.d. Calcium flows down the T tubules to stimulate the influx of sodium from the sarcoplasmic reticulum.  

Which muscle group is involved when a “pulled groin” occurs? A) quadricepsB) thigh adductorsC) lateral rotatorsD) hamstrings  

During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________. A) a strong baseB) stearic acidC) hydrochloric acidD) lactic acid