Flashcards in Motor physiology Deck (40):
Type II muscles: glycolytic or oxidative?
Soleus and antigravity muscles of the back are examples of type __ muscle fibers.
What kind of smooth muscles have gap junctions?
Unitary or syncytial or visceral smooth muscles
There is no true AP propagation in this type of smooth muscle
Multi unit smooth muscle
Examples of unitary smooth muscles
Thick filaments are composed of
Area between two z lines
Stabilizes sarcolemma and prevents contraction-induced rupture
The H zone contains: myosin only, actin only, both myosin and actin
Which does not shorten during skeletal muscle contraction?
A band which represents entire length of myosin
Binds z lines to sarcolemma
Depolarization of T tubules causes
Activation of dihydropyridine receptor in T tubules
DHPR causes activation of _______ receptor which releases ______ ions
Calcium binds to what troponin?
When ATP binds to cleft on myosin head, there is conformational change which causes _______ affinity of myosin for actin
ATP hydrolysis causes recocking of Myosin head. True or False?
Distance achieved in a single power stroke
Basis for Treppe effect
Pushing against the wall is isometric or isotonic contraction?
Load is held constant in _______ contraction
Protective mechanism to prevent muscle injury or death
Phase 2 of cardiac muscle contraction is the _______ and is due to _____ of _________
Phase 0 of cardiac AP is due to
Why is there no tetany in cardiac muscles?
Long phase 2 ( long refractory period)
Phase 3 or final repolarization is due to
Decrease Ca influx
Increased K efflux
In the smooth muscle, calcium binds to ________ which is similar to troponin C of skeletal muscle
________ phosphorylates myosin
Activated myosin light chain kinase
Alpha motor neuron is for _______ fibers
Intrafusal fibers is associated with
Gamma motor neurons
Muscle spindle detect changes in muscle
Length and rate of change of muscle length
Golgi tendons are arranged in a ______ manner and detect changes in muscle _____
Sense of awareness of the position of body in space
Proteins in smooth muscle that are equivalent to troponin I
_______ motor neurons are the final common pathway
Alpha motor neurons
Purkinje layer of the cerebellum is always __________
Symptoms of cerebellar dysfunction
Ataxia dysmetria dysdiadochokinesia
Function of Renshaw cells
Inhibitory cells in the ventral horns of the spinal cord
Flexor withdrawal reflex is an example of a ______ synaptic reflex
Opposite of stretch reflex
Golgi tendon reflex