Muscle Function and Neuromuscular Reflex
Terms in this set (14)
T/F: Muscle cells are excitable with a NEGATIVELY charged interior at rest
T/F: Interpretation of stimuli is a function of the SPINAL CORD OR BRAIN STEM
T/F: A POLYSYNAPTIC reflex does not involve an interneuron
T/F: An afferent neuron is also called a MOTOR NEURON and carries impulses to the spinal cord
F: SENSORY NEURON
T/F: The greater the strength of contraction, the LESSER the amplitude of electrical activity
T/F: Cocking your wrist requires the contraction of the FLEXORS of the forearm
T/F: If you have tennis elbow, you should lift an object with your palm FACING UP
T/F: Typing on a keyboard with your wrist resting on the table can cause injury to the EXTENSOR muscles of the forearm
T/F: The reaction time for the involuntary activation of the quadriceps muscle should be LONGER than the voluntary activation time
T/F: The distance traveled in the reflex arc is shorter than the distance a nerve impulse must travel for a voluntary contraction
What is an Electromyogram and what us it used for?
- an EMG is a graphical recording of electrical activity with in muscles
- they are used to diagnose disorders dealing with muscles and the nerves that supply them
Relationship between muscle contraction and the amplitude of electrical activity..
- the stronger the contraction, the greater the electrical activity
Relationship between hand position (palm up/palm down) and muscle activity when an object was lifted and why
- palm down showed more muscle activity because different muscles were being used
Why a wrist brace is an effective treatment for tennis elbow
- it helps rest the muscles in the wrist that pull on the elbow
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