Exam 1 Test Questions Flashcards
(46 cards)
Which enzyme rate limits or regulates lipolysis?
Hormone Sensitive Lipase
When a muscle produces force while lengthening it is defined as an…
Eccentric Action
An RER of >.9 should indicate a reliance on which mactronutrient fuel source?
Glucose (Carbohydrates)
If Rafael was well trained and walked an entire marathon at a relatively light intensity, which mactronutrient fuel source would he most likely rely on for energy production?
Lipids (Fats)
Which energy system would be dominant during a marathon (walking, light intensity)?
Mitochondrial Respiration
Which energy system is best assessed with a vertical jump?
Immediate
Which hormones can stimulate lipolysis to mobilize free fatty acids as a fuel source?
Growth Hormone
Epinephrine
Norepinephrine
Glucagon
What anatomical property enables Type I skeletal muscle fibers to use aerobic metabolism well?
They contain a lot of mitochondria
Which respiratory parameter indicates the normal or “average” volume of air inspired/expired per breath?
Vt
Which hormone facilitates AA uptake and protein synthesis in bone and muscle?
Insulin-like growth factor-1
Which neurotransmitter is used by the parasympathetic nervous system (PSNS) to activate the appropriate arterial receptors?
Acetylcholine
Which arterial receptor is activated by Acetylcholine in the PSNS?
B2 arterial receptors
In reference to the previous question, what happens to arteries in response to PSNS activation?
Vasodilation occurs everywhere in the systemic circulation
Within a sarcomere, which identifiable features will change size or length during eccentric muscle contraction?
I-band
H-zone
Which enzyme hydrolyzes ATP into ADP and Pi during the sliding filament process?
Myosin ATPase
Which cardiovascular parameter provides an indication of systemic perfusion pressure?
Mean arterial pressure
Which blood flow mechanism involves expansion of the thoracic cavity, which decreases the pressure within the cavity, which in turn facilitates venous blood return to the heart?
Respiratory Pump
What respiratory parameters would be affected by a restrictive lung disease (such as pulmonary fibrosis), and how?
Decreased FVC
Decreased FEV1
Unaffected ratio of FEV1/FVC
What is the direct culprit behind “muscle burn” and short-term fatigue during high intensity exercise?
H+ accumulation in the sarcoplasm
What is the primary reason why fast eccentric contractions elicit greater force output than fast concentric contractions?
Stored elastic energy contributes to the force production of the eccentric contraction
What is the potential benefits of a pennated muscle?
More cross bridging
Greater force production
What do chemoreceptors primarily monitor to help regulate/determine ventilation?
PCO2
Explain how post-activation potentiation PAP works to increase muscle force output.
30-sec after a high-intensity muscle contraction the activated motor neurons are more easily excitable
For a given submaximal exercise intensity, how would an increase in preload affect cardiac function?
Decreased HR
Increase SV