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Physiology

Week 6 - Articulation and Muscle Contraction

QuestionAnswer
The joint located (during the growth years) between the epiphysis and diaphysis of the long bone. Synchondrosis
The number of muscle fibers contracting depends on: Number of motor units recruited.
Muscle contractions will continue as long as: Calcium Ions are attached to the troponin.
Noninflammatory joint disorders: dislocation and osteoarthritis
Inflammatory joint disorder Juvenile rheumatoid arthritis
What type of contractions are most body movements? Isotonic.
The strength of a muscle contraction is influenced by: Recruitment of motor units.
What type of joint is a condyloid? Biaxial.
Aerobic Respiration produces the max amount of energy from: Each glucose molecule.
Painful muscle contractions or involuntary twitches: cramps
Motor neurons stimulate: Muscle fibers
How many muscle fibers do motor neurons stimulate? Some stimulate only a few dozen muscle fibers; some stimulate a few thousand muscle fibers!
Precise movements do NOT depend on: the number of muscle fibers stimulated.
What are three characteristics of an isometric contraction? tension is produced by by the myosin cross-bridges cannot overcome the load placed on the muscle; the muscle does not shorten; it can produce work by tightening to resist a force
If you attempt to pick up an object which is too heavy to lift, which type of muscle contraction will result? Isometric
What three issues may cause muscle fatigue? a relative lack of ATP; high levels of lactate; failure of the sodium-potassium pumps
What is an example of a hinge joint? Interphalangeal joint
What is an example of a pivot joint? head of the radius articulating with the ulna
Isometric contractions can be described by: static tension
Created by: stormybrook75
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