Strength and Conditioning (Quiz 1)

Quiz to Test Questions

A motor unit consists of:

a motor neuron and all the muscle fibers it innervates

Which of the following substances acts at the neuromuscular junction to excite the muscle fibers of a motor unit?

Acetylcholine

Which of the following types of muscle action occurs when the muscle lengthens despite attempting to shorten?

eccentric

Identify what plane is labeled 1; 2; 3

Frontal, Sagittal and Transverse

Which of the following substances regulates muscle actions?

Calcium

All of the following are considered to be advantages when using weight-stack machines except

simulated real-life activities

A muscle most involved in movement is the _______ while the _____ slows down or stops the movement

agonist; antagonist

Which of the following describes the flow of blood?

right atrium, right ventricle, lungs, left atrium, left ventricle, body 

Which of the following muscles acts synergistically to the rectus femoris during the upward movement phase of the low-bar back squat?

biceps femoris

Neural control affects the maximal force output of a muscle by determining which and how many motor units are involved in a muscle contraction and the rate at which the motor units are fired. These two factors are known as what, respectively? 

recruitment; rate coding

As an athlete's body size increases, which of the following describes how body mass and muscular strength change? 

Body mass increases more rapidly than muscular strength

To which of the following structures do the cross-bridges attach when activated?

Actin

A vertical jump involves knee, hip and shoulder movement in primarily which plane?

sagittal

Development of muscle force is controlled by:

frequency of motor neuron stimulation

Relaxation of a muscle fiber occurs when:

calcium is pumped into the sarcoplasmic reticulum

Two individuals of the same body mass are lifting weights. Assuming all other factors to be equal, the person with tendons inserted on the bone _______________ the joint center should be able to lift _______________ weight. 

farther from; a heavier

Which of the following ankle movements and planes of action are associated with the upward movement phase of the standing calf(heel) raise exercise?

plantar flexion: sagittal