The predominant energy system used during exercise will depend on
the intensity and duration of the activity and the individual’s levels of fitness
.
Which one of the following factors is most important in determining which energy system an athlete will predominantly rely on during an exercise session?
The predominant energy system used during exercise will depend on
the intensity and duration of the activity and the individual’s levels of fitness
.
Which of the following structures of a sarcomere shrinks when a muscle fully contracts?
During muscular contraction, the myosin heads pull the actin filaments toward one another resulting in a shortened sarcomere. While
the I band and H zone
will disappear or shorten, the A band length will remain unchanged.
Which nutrient can be used to produce energy in the absence of oxygen quizlet?
Glucose
is stored in the muscles and liver as glycogen. Before glycogen can be used to provide energy to make ATP, it has to be converted to glucose. This process is called glycolosis and the lactic acid system is sometimes referred to as anaerobic glycolosis, due to the absence of oxygen.
Which is the greatest determiner of muscle strength?
Muscle strength is directly dependant upon
the size of the cross-sectional area of muscle
, so if after a period of training, you increase your muscle size by 50%, you will also increase the force the muscle can develop by 50%.
What are the 3 main energy systems?
- Anaerobic Alactic (ATP-CP) Energy System (High Intensity – Short Duration/Bursts) …
- Anaerobic Lactic (Glycolytic) Energy System (High to Medium Intensity – Uptempo) …
- Aerobic Energy System (Low Intensity – Long Duration – Endurance)
What are the three basic energy system?
There are three energy systems:
the immediate energy system, the glycolytic system, and the oxidative system
. All three systems work simultaneously to a degree, but parts of the system will become predominant depending on what the needs of the body are.
What are the steps of muscle contraction?
- exposure of active sites – Ca2+ binds to troponin receptors.
- Formation of cross-bridges – myosin interacts with actin.
- pivoting of myosin heads.
- detachment of cross-bridges.
- reactivation of myosin.
What are three sources of energy for muscle contraction?
ATP is required for muscle contraction. Four sources of this substance are available to muscle fibers:
free ATP, phosphocreatine, glycolysis and cellular respiration
. A small amount of free ATP is available in the muscle for immediate use.
Which zone decreases during the muscle contraction?
The H zone
—the central region of the A zone—contains only thick filaments and is shortened during contraction.
Which micronutrient is important for the production of energy ie ATP )?
| Mineral Function | Iron Required for many proteins and enzymes, notably hemoglobin, to prevent anemia | * Magnesium Required co-factor for ATP formation; bone formation; normal membrane functions; muscle function | Manganese (trace amounts) A cofactor in enzyme functions; trace amounts are required |
|---|
What process does not require oxygen for ATP?
Fermentation
. Some organisms are able to continually convert energy without the presence of oxygen. They undergo glycolysis, followed by the anaerobic process of fermentation to make ATP.
Which process converts sugar into ATP in the absence of oxygen?
Which process converts sugar into ATP in the absence of oxygen?
Fermentation
happens in anaerobic conditions (i.e.,without oxygen). Fermentation begins with glycolysis which breaks down glucose into two pyruvate molecules and produces two ATP (net) and two NADH.
What are 4 factors that would affect muscle strength?
- Age. Another factor over which we have little control is age. …
- Gender. Gender does not affect the quality of our muscle, but does influence the quantity. …
- Limb and Muscle Length. …
- 7 Step Guide to Becoming a Personal Trainer.
- Point of Tendon Insertion. …
- Other Important Factors.
What determines how strong you?
An individual’s physical strength is determined by two factors:
the cross-sectional area of muscle fibers recruited to generate force and the intensity of the recruitment
. … Other considerations are the ability to recruit muscle fibers for a particular activity, joint angles, and the length of each limb.
Which exercise works the pectorals as primary mover?
Pecs Are the Primary Mover
Your chest muscle – or more specifically, the pectoralis major – is classified as the primary mover during
push-ups
. That means that your pecs are taking most of the load during push-ups, although they’re far from the only muscle that’s working.
