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Physiology
Week 6 - Articulation and Muscle Contraction
Question | Answer |
---|---|
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 |