Question 49 Why is the oxygen deficit in the beginning of exercise less in train
ID: 3516126 • Letter: Q
Question
Question 49
Why is the oxygen deficit in the beginning of exercise less in trained endurance athletes compared to untrained persons? Select all that apply.
A.
Increased ratio of slow-twitch muscle fibers
B.
Greater phosphofructokinase activity
C.
Greater sympathetic nervous system activation
D.
Increased mitrochondrial density
Question 52
Acids are defined as
A.
molecules that release hydroxyl ions (OH-).
B.
substances that lower the hydrogen ion concentration of the solution.
C.
molecules that release hydrogen ions (H+).
D.
molecules that combine with hydrogen ions.
Question 54
The __?__ works like a thermostat to control body temperature during exercise.
A.
Cardiorespiratory Center
B.
Hypothalamus
C.
Adrenal Gland
D.
Temperature regulation center (TRC)
E.
Cerebellum
Question 57
Which of the following is the primary mechanism for sparing glucose during prolonged exercise?
A.
quick breakdown of glycogen in the liver so that more blood glucose is available during exercise
B.
increased free fatty acid (FFA) mobilization during exercise
C.
increased use of protein as a fuel source
D.
increased ability to secrete insulin for glucose uptake
E.
all of the above are correct
Question 58
The Bohr effect
A.
Improves oxy-hemoglobin dissociation
B.
None of the above
C.
Improves oxygen-hemoglobin binding
D.
impairs O2 delivery in peripheral tissue
A.
Increased ratio of slow-twitch muscle fibers
B.
Greater phosphofructokinase activity
C.
Greater sympathetic nervous system activation
D.
Increased mitrochondrial density
Explanation / Answer
49.A
52.c
54.hypothalamus of brain works as thermostat.
57.D.incresing glucose uptake to working Skelton muscle is primarilydue to increse in translocation. Of insulin and GLUT4
58.A.bohr effect describes reduction in oxygen affinity of haemoglobin when ph is low and increases affinity when ph is high.it helps with the offloading of oxygen from heamoglobin to provide vital oxygen.
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