1. Anything that elevates the concentration of the following ion in the myoplasm
ID: 3524803 • Letter: 1
Question
1. Anything that elevates the concentration of the following ion in the myoplasm will lead to actin-myosin force develop:
a. calcium
b. chloride
c. potassium
d. sodium
2. Typically, the major physiological adaptation that results in an increased VO2max in healthy individuals in response to endurance exercise training is:
a. Increased maximum heart rate
b. Increased maximum stroke volume
c. increased maximum minute volume of ventilation
d. increased hemoglobin
3. A 260-pound (118-kg) athlete ran up 50 stadium steps in 12.0 seconds. The height of each step was 30 cm. Considering only the vertical displacement, what was the total work and the average power of this athlete in running up the 50 steps?
a. Total work = 35.4 kgm; Average power = 177 kgm/min
b. Total work = 3,900 kgm; Average power = 19,500 kgm/min
c. Total work = 1,770 kgm; Average power = 354 kgm/min
d. Total work = 1,770 kgm; Average power = 8,850 kgm/min
4. Which of the following is a typical VO2max value of a competitive female Olympic marathon runner?
a. 3.5 ml/kg/min;
b. 35 ml/kg/min;
c. 50 ml/kg/min;
d. 75 ml/kg/min;
Explanation / Answer
Q1. In the muscle contraction the elevation of concentration of calcium ions in myoplasm leads to development of actin-myosin force.
Q2.The major physiological adaptation that results in an increased VO2 max in healthy individuals in response to endurence exercise is increased maximum heart rate.
Q3. the correct option (d).
work=weight*9.8*distance
=(mass/9.8)**9.8*distance
=(118/9.8)*9.8*50*(30/100)
=1770kgm
Average power=w/t
=1770/(12/60) min
=8,850 kgm/min
Q4. typical VO2max value of a competitive female Olympic marathon runner is 50 ml/kg/min.
hence, the correct option is (c).
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