Answers.
The pelvis is located _______________ to the patella. - Correct Answer superior
Which of the following is the smallest contractile unit of skeletal muscle?
myosin
epimysium
sarcolemma
sarcomere - Correct Answer sarcomere
Which of the following describes Type I muscle fibers?
rapid force development capabilities
fatigue resistant with high aerobic energy supply
inefficient and easily fatigable
high myosin ATPase activity - Correct Answer fatigue resistant with high aerobic energy
supply
Which of the following describes the flow of blood? - Correct Answer right atrium, right
ventricle, lungs, left atrium, left ventricle, body
On average, how many times per minute does the SA node discharge at rest? - Correct
Answer 60-80
Which of the following are the two main divisions of the skeletal system? - Correct
Answer appendicular and axial
Some of the highest bone mineral densities have been seen in which of the following
types of athletes? - Correct Answer gymnasts
What joint comprises the ankle and wrist joints? - Correct Answer biaxial
Which of the following is the order of the phases of a muscle contraction? - Correct
Answer resting, excitation-contraction coupling, contraction, recharge, relaxation
,The chronotropic effect is caused by stimulation of the _______________ nervous
system and causes the heart rate to _______________. - Correct Answer sympathetic;
increase
Which of the following substances regulates muscle actions? - Correct Answer Calcium
Which of the following substances acts as the neuromuscular junction to excite the
muscle fibers of a motor unit? - Correct Answer Acetylcholine
When throwing a baseball, an athlete's arm is rapidly stretched just before throwing the
ball. Which of the following structures detects and responds to that stretch by reflexively
increasing muscle activity? - Correct Answer Muscle Spindle
From which of the following is the heart's electrical impulse normally initiated? - Correct
Answer SA node
Which of the following occurs during the QRS complex of a typical ECG?
Depolarization of the Atrium
Repolarization of the Atrium
Repolarization of the Ventricle
Depolarization of the Ventricle - Correct Answer Depolarization of the Atrium
Repolarization of the Ventricle
The Krebs cycle occurs in which portion of the cell? - Correct Answer mitochondria
The law of mass action states which of the following?
The rate of product formation is greatly influenced by the concentrations of the reactants.
The concentrations of reactants or products will drive the direction of the reactions.
A stronger action potential cannot produce a stronger contraction.
The weight or mass of an object creates a stronger action potential. - Correct Answer The
concentrations of reactants or products will drive the direction of the reactions.
An aerobic endurance athlete is trying to give himself a competitive edge over his
opponents. To improve his lactate threshold, what type of training should he engage in,
, and in what direction would this shift his threshold? - Correct Answer high intensity; shifts
to the right
Two athletes are competing in upcoming competitions, a weightlifting meet and a
marathon. Which energy systems will each be primarily using, respectively? - Correct
Answer phosphagen and oxidative
Which of the following describes the portion of the total energy cost of exercise that must
be supplied through anaerobic mechanisms due to the slow response of the aerobic
system to the initial increase in the demand for energy?
oxygen deficit
EPOC
oxygen debt
recovery O2 - Correct Answer oxygen deficit
The excess postexercise oxygen consumption experienced by athletes is caused by all of
the following EXCEPT
decreases in body temperature
increased protein turnover
ATP-CP resynthesis
changes in energy efficiency during recovery - Correct Answer decreases in body
temperature
If an athlete completes a maximum sprint interval in 10 seconds as part of an interval
training workout, which of the following is a recommended length of the rest period before
the next sprint? - Correct Answer 2 minutes
During higher-intensity exercises, athletes often experience peripheral fatigue. Which of
the following is believed to be the reason for this type of fatigue?
lactate
gluconeogenesis
increase in muscle pH
metabolic acidosis - Correct Answer metabolic acidosis
An athlete is used to performing high-intensity aerobic exercise (90% VO2max);
however, she will now be changing to longer-duration, submaximal exercise on a regular