42 Questions
What is the type of summation that occurs when multiple motor units are recruited?
Spatial Summation
What is the result of High Frequency Stimulation without complete relaxation?
Tension continues to increase
What happens to calcium ions during High Frequency Stimulation?
Some calcium ions return to the SR
What is the order in which motor units are recruited according to the Size Principle?
Smallest fibers to largest fibers
What is the result of Very High Frequency of Stimulation?
Maximum tension + Fusion of twitches = Complete Tetanus
What is the term for the process of recruiting multiple motor units?
Spatial Summation
What is the term for the fusion of twitches that results in a smooth, sustained contraction?
Tetanus
What is the principle that dictates the order of motor unit recruitment?
Size Principle
What happens when a muscle is stretched?
It becomes more tense
What occurs when Ca2+ is reabsorbed too quickly?
Less time for actin-myosin interaction
What happens when the muscle is stimulated faster?
Less calcium is reabsorbed
What is the result of more actin-myosin interactions?
More muscle contraction
What happens to tension when the muscle is stimulated faster?
It increases
What happens to calcium when the muscle is stimulated faster?
Less calcium is stored
What is the ultimate result of increasing the frequency of electrical stimulation?
Muscle contraction
What happens when the stimulation stops?
Tension drops
What happens when motor units are stimulated asynchronously?
Smaller, sustained contraction and prevention of muscle fatigue occur
What is the function of titin in muscle contraction?
To anchor myosin to Z-disc
What type of contraction occurs when a muscle contracts but does not change in length?
Isometric contraction
Which muscle is capable of producing a long duration of isometric exercise?
Soleus muscle
What happens when an object is too heavy and you need to stimulate all neurons?
You will get tired easily
What is the purpose of cross-bridges in muscle contraction?
To develop tension without changing muscle length
What is an example of an isometric contraction in daily life?
Sitting upright
What type of fibers take a while to contract and tire out?
Larger fibers
What is the primary function of an agonist muscle?
To provide the majority of force for the movement
What happens when the afterload increases?
Muscle contraction becomes isometric
What type of contraction occurs when there is a change in the length of the muscle?
Isotonic
What is the role of the antagonist muscle?
To resist the action of the agonist
What is the sequence of muscle contractions in daily life?
Isometric - Isotonic - Isometric
What type of contraction occurs when there is no change in the length of the muscle?
Isometric
What is the term used to describe the load that the muscle must overcome to contract?
Afterload
What happens to the muscle contraction as the object becomes heavier?
Isometric contraction increases
What is the main reason why active tension accurately measures the contractile force of the muscle?
Actin and myosin binding happens
What is the effect of increasing the afterload on the velocity of muscle contraction?
It decreases the velocity
What is the type of muscle contraction that occurs when the load is maximal and the muscle does not shorten?
Isometric contraction
What is the relationship between the afterload and the velocity of muscle contraction?
Inversely proportional
Which type of muscle contraction occurs when the muscle shortens and the load is low?
Concentric contraction
What is the main difference between a 5kg and a 20kg dumbbell in terms of muscle contraction?
The 5kg dumbbell is lighter and can be lifted faster
What is the location of isometric contraction on the force-velocity graph?
On the x-axis
What is the type of muscle contraction that occurs when the muscle lengthens and the load is high?
Eccentric contraction
What is the effect of a high load on the velocity of muscle contraction?
It decreases the velocity
What is the relationship between the force and velocity of muscle contraction?
The force is inversely proportional to the velocity
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