HSC 308 Exam 1 Questions with All Correct Answers
What might the human body need to make the immediate energy systems work better? - Answer- More enzyme because then more ADP can be combined to get more ATP and more PCr can also be used to be combined with ADP to make more ATP
Does aerobic e...
HSC 308 Exam 1 Questions with
All Correct Answers
What might the human body need to make the immediate energy systems work better?
- Answer- More enzyme because then more ADP can be combined to get more ATP
and more PCr can also be used to be combined with ADP to make more ATP
Does aerobic exercise increase phosphocreatine kinase activity? - Answer- NO
Metabolic adaptations to immediate energy systems during aerobic exercise training -
Answer- No change in substrate storage
No change in enzyme activity
Metabolic adaptations to immediate energy systems in anaerobic exercise training -
Answer- No change in phosphocreatine
Increase in both immediate energy system enzymes (creatine kinase and myokinase)
Aerobically trained individuals have less glycogen phosphorylase in muscle because -
Answer- you can save the amount of carbohydrate in muscle to be used for long
distance events
If PFK goes goes, - Answer- glycolytic activity goes down
Metabolic adaptations in glycolysis for aerobic exercise training - Answer- Increase in
skeletal muscle glycogen storage and decrease in glycogen phosphorylase
Metabolic adaptations in glycolysis for anaerobic exercise training - Answer- Increase
skeletal muscle glycogen storage and increase in PFK
If pyruvate does not get converted to Acetyl CoA, - Answer- you get lactate
Increased PDH is important in aerobically trained individuals because - Answer- once
pyruvate is converted to Acetyl CoA, it is going to go through the krebs cycle resulting in
ATP
Metabolic adaptations in the oxidative system for aerobic exercise training - Answer-
Increase in skeletal muscle glycogen and lipid storage and increase in PDH, HAD and
CS
Characteristics of Skeletal muscle include: - Answer- 1. Motor unit size
2. Muscle fibers per motor unit
3. Motor unit strength
, 4. Type of myosin ATPase
5. Sarcoplasmic Reticulum development
6. Contraction speed
7. Motor unit conduction velocity
Motor unit size is dictated by: - Answer- 1. Actual width of motor neuron
2. Number of branches
Metabolic adaptations in the oxidative system for anaerobic exercise training - Answer-
Increase in skeletal muscle glycogen and lipid storage and increase in PDH, HAD and
CS
What are the three types of muscle tissue? - Answer- Smooth
Cardiac
Skeletal
Smooth muscle is: - Answer- involuntary, hollow organs, blood vessels
Cardiac Muscle is: - Answer- involuntary, found in the heart
Skeletal muscle is: - Answer- voluntary, makes up the skeleton
Myosin (thick filaments) is: - Answer- two intertwined filaments with globular heads
Globular Heads - Answer- protrude 360 deg. from thick filament axis and will interact
with actin filaments for contraction
Myosin is stabilized by: - Answer- titin
Actin (thin filaments) is: - Answer- composed of three proteins
-Actin contains the myosin binding site
-tropomyosin covers active site at rest
-troponin is anchored to actin, moves tropomyosin
Actin is anchored at the Z-disk by: - Answer- nebulin
Cross bridge cycle steps - Answer- 1. Cross bridge formation
2. power stroke
3. cross bridge detachment
4. reactivation of myosin head
During cross bridge formation, - Answer- inorganic phosphate is released
During the power stroke, - Answer- myofilament slides
a-motor nuerons - Answer- innervate muscle fibers
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