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Physio Test 3
Tri 2
| Question | Answer |
|---|---|
| What could be reasonably said of nerve compression? | Velocity of the nerve action potential is slowed |
| What causes release of Ca++ from the SR? | Voltage sensitive protein pillars attached to the T tubules |
| What contains electrical synapses?` | SMOOTH MUSCLE |
| During isometric contraction the skeletal fiber does what? | stays the same length |
| What could produce an action potential in the post synaptic neuron? | When the summation of the EPSPs exceeds the summation of the IPSPs |
| Which area of the sarcomere shortens during contraction? | H zone |
| In skeletal muscle the passive tendon curve tends to rise at a steeper rate as the sarcomere length increases due to what? | the increased tension in the series and parallel elastic units |
| What is a temporal summation? | Two or more hypopolarizing signals arriving at very short intervals from the same presynaptic neuron |
| What does it mean ..the myosin light chains in skeletal muscle are continuously phosphoralated? | Myosin heads are preactivated to bind actin |
| What does a chiro thrust lead to? | Disruption of adhesions and Ca collegan cross bridging in connective tissue |
| What is true of skeletal muscle? | SR has sufficient Ca for several thousand contractions |
| What is a motor unit? | a single alpha motor neuron and all the skeletal fibers it innervates |
| Where would you find the neuromuscular junction? | Center of fiber |
| What are the consequences of a vertebral motion segment stretched on its side to its opposite side? | Nerve compression, lower # of collagen fibers, lower # of Ca crossbridges. You would not have a increased bloodflow |
| What are the consequences to a subluxated joint? | joint immobilization, thicker connective tissue, more Ca crossbridging, spinal stiffness, skeletal muscle activated on one side and weak on the other, possible fusion. |
| How many Ca ions are moved for each ATP utilized by the Ca ATPase pump? | 2 |
| What would result from the binding of ATP the myosin head? | release of the actin fiber |
| What will strettching a skeletal muscle fiber beyond its resting length result in? | A decrease in tension development |
| What is the time period for a single adjustment correction? | 6 weeks |
| What is the connective tissue response to a lack of strain? | Decrease in number of collagen fibers and remoce Ca crossbridges |
| What is the eventual consequence of not removing a subluxation? | bony ankalosis and loss of joint function |
| Which synapse is always inhibitory? | Axoaxonic |
| What would result in the hyperpolarization of the post synaptic membrane? | K+ leaving the cell |
| What is an isometric contraction? | Tension development in muscle fiber without a change in overall length |
| How many myosin head binding sites does tropomyosin cover on the actin fiber? | 7 |
| At what phase during a skeletal muscle contraction does the load begin to lift? | Isotonic contraction phase |
| How does a subluxation begin? | Kinesiological |
| What are the receptors at the neuromuscular junction? | Ligand gated NA channels |
Created by:
hwhite
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